SCHEDULE 14A
                                 (RULE 14A-101)

                     INFORMATION REQUIRED IN PROXY STATEMENT
                            SCHEDULE 14A INFORMATION
           PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES
                              EXCHANGE ACT OF 1934

Filed by the registrant    |X|
Filed by a Party other than the Registrant   |_|

Check the appropriate box:
  |_|   Preliminary Proxy Statement          |_|   Confidential, For Use of the
  |X|   Definitive Proxy Statement                 Commission Only (as permitted
  |_|   Definitive Additional Materials            by Rule 14a-6(e)(2))
  |_|   Soliciting Material Pursuant to
        Rule 14a-11(c) or Rule 14a-12

                          BIOSOURCE INTERNATIONAL, INC.
- --------------------------------------------------------------------------------
                (Name of Registrant as Specified in Its Charter)


- --------------------------------------------------------------------------------
    (Name of Person(s) Filing Proxy Statement, if Other Than the Registrant)

Payment of Filing Fee (Check the appropriate box):

     |X|  No Fee Required

     |_|  Fee  computed on table below per Exchange  Act Rules  14a-6(i)(1)  and
          0-11.

     (1)  Title of each class of securities to which transaction applies:

- --------------------------------------------------------------------------------

     (2)  Aggregate number of securities to which transactions applies:

- --------------------------------------------------------------------------------

     (3)  Per unit  price  or other  underlying  value of  transaction  computed
          pursuant to Exchange  Act Rule 0-11 (set forth the amount on which the
          filing fee is calculated and state how it was determined):

- --------------------------------------------------------------------------------

     (4)  Proposed maximum aggregate value of transaction:

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     (5)  Total fee paid:

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     |_|  Fee paid previously with preliminary materials:

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     |_|  Check box if any part of the fee is offset as provided by Exchange Act
          Rule  0-11(a)(2)  and identify the filing for which the offsetting fee
          was paid  previously.  Identify  the previous  filing by  registration
          statement number, or the form or schedule and the date of its filing.

     (1)  Amount previously paid:

- --------------------------------------------------------------------------------

     (2)  Form, Schedule or Registration Statement no.:

- --------------------------------------------------------------------------------

     (3)  Filing party:

- --------------------------------------------------------------------------------

     (4)  Date filed:

- --------------------------------------------------------------------------------





                          BIOSOURCE INTERNATIONAL, INC.
                                   -----------

                    NOTICE OF ANNUAL MEETING OF STOCKHOLDERS
                            TO BE HELD JULY 18, 2003
                                   -----------


TO OUR STOCKHOLDERS:

         Notice is hereby given that the 2003 Annual Meeting of  Stockholders of
BioSource International, Inc. (the "Company") will be held at the Hyatt Westlake
Plaza, 880 S. Westlake Blvd., Westlake Village,  California,  91361, on July 18,
2003 at 9:00  a.m.,  Pacific  Time.  The  Annual  Meeting  is being held for the
following purposes:


         1.       To elect six  directors  to hold office for one year and until
                  their  respective  successors  have been elected.  The persons
                  nominated  by our Board of  Directors,  Jean-Pierre  L. Conte,
                  Leonard  M.  Hendrickson,  David  J.  Moffa,  Ph.D.,  John  R.
                  Overturf, Jr., Robert J. Weltman, and John L. Zabriskie, Ph.D.
                  are described in the accompanying Proxy Statement;

         2.       To ratify  the  appointment  of KPMG LLP,  as our  independent
                  public accountants for the year ending December 31, 2003; and

         3.       To transact  such other  business as may properly  come before
                  the  Annual  Meeting  or  any  adjournments  or  postponements
                  thereof.

         Only  stockholders  of  record  of our  common  stock  at the  close of
business on May 20,  2003,  are  entitled to notice of and to vote at the Annual
Meeting and at any adjournments or postponements thereof.

         All  stockholders of record are cordially  invited to attend the Annual
Meeting in person. However, to ensure your representation at the Annual Meeting,
you are  urged to mark,  sign and  return  the  enclosed  Proxy as  promptly  as
possible  in the  postage  prepaid  envelope  enclosed  for  that  purpose.  Any
stockholder  of record  attending  the Annual  Meeting may vote in person,  even
though he or she has returned a Proxy.


                                      BY ORDER OF THE BOARD OF DIRECTORS


                                        /S/ CHARLES C. BEST
                                      ------------------------------------------
                                      Charles C. Best,
                                      CHIEF FINANCIAL OFFICER AND
                                        EXECUTIVE V.P., FINANCE


Camarillo, California
May 21, 2003

IN ORDER TO ENSURE YOUR  REPRESENTATION AT THE MEETING,  PLEASE COMPLETE,  DATE,
SIGN AND RETURN THE ACCOMPANYING  PROXY IN THE ENCLOSED  ENVELOPE AS PROMPTLY AS
POSSIBLE.  IF YOU  RECEIVE  MORE  THAN ONE PROXY  CARD  BECAUSE  YOU OWN  SHARES
REGISTERED  IN DIFFERENT  NAMES OR AT A DIFFERENT  ADDRESS,  EACH CARD SHOULD BE
COMPLETED AND RETURNED.





                          BIOSOURCE INTERNATIONAL, INC.
                                 542 FLYNN ROAD
                           CAMARILLO, CALIFORNIA 93012
                                 (805) 987-0086
                                ----------------

                                 PROXY STATEMENT

                         ANNUAL MEETING OF STOCKHOLDERS
                            TO BE HELD JULY 18, 2003

                                  INTRODUCTION

         This Proxy Statement is furnished in connection  with the  solicitation
of  proxies  by the Board of  Directors  of  BioSource  International,  Inc.,  a
Delaware  corporation  (the  "Company"),  for use at the 2003 Annual  Meeting of
Stockholders  (the "Annual  Meeting") to be held at Hyatt Westlake Plaza, 880 S.
Westlake Blvd.,  Westlake Village,  California,  91361, on July 18, 2003 at 9:00
a.m.,  Pacific Time, and at any adjournments or postponements  thereof,  for the
purposes  set forth  herein  and in the  attached  Notice of Annual  Meeting  of
Stockholders. Accompanying this Proxy Statement is the Board of Directors' Proxy
for the Annual Meeting, which you may use to indicate your vote on the proposals
described in this Proxy Statement.

         All Proxies  which are  properly  completed,  signed and returned to us
prior to the  Annual  Meeting,  and which  have not been  revoked,  will  unless
otherwise   directed  by  the  stockholder  be  voted  in  accordance  with  the
recommendations  of the Board of Directors set forth in this Proxy Statement.  A
stockholder of record may revoke his or her Proxy at any time before it is voted
either by filing with our  Secretary,  at our  principal  executive  offices,  a
written  notice of revocation or a duly executed  proxy bearing a later date, or
by  attending  the Annual  Meeting  and  expressing  a desire to vote his or her
shares in person.

         The close of business on May 20, 2003 has been fixed as the record date
for the  determination of stockholders  entitled to notice of and to vote at the
Annual Meeting or at any adjournments or postponements of the Annual Meeting. At
the record date,  9,555,955  shares of common stock,  par value $.001 per share,
were  outstanding.  Our  common  stock  is the  only  outstanding  class  of our
securities entitled to vote at the Annual Meeting.

         It is anticipated that this Proxy Statement and the accompanying  Proxy
will be mailed to stockholders on or about June 5, 2003.

                                VOTING PROCEDURES

         A  stockholder  is  entitled  to cast one vote for each  share  held of
record on the record date on all matters to be considered at the Annual Meeting.
The six nominees for election as directors at the Annual Meeting who receive the
highest  number of  affirmative  votes will be elected.  Abstentions  and broker
non-votes will be included in the number of shares present at the Annual Meeting
for the purpose of  determining  the presence of a quorum.  Abstentions  will be
counted  toward  the  tabulation  of  votes  cast  on  proposals   submitted  to
stockholders  and will have the same  effect as  negative  votes,  while  broker
non-votes will not be counted as votes cast for or against such matters.


                                       1





                              ELECTION OF DIRECTORS

         On April 22, 2003, in light of the resignation of our former  director,
Robert D. Weist for personal reasons, the Board of Directors, in accordance with
the Bylaws of the Company, passed a resolution reducing the size of the Board to
six members, from its previous seven-member composition.  At each annual meeting
of  stockholders,  the  directors  are elected,  each for a one-year  term.  Six
directors will be elected at the Annual Meeting.

         Unless  otherwise  instructed,  the Proxy holders will vote the Proxies
received  by them for the  nominees  named  below.  If any  nominee is unable or
unwilling  to  serve as a  director  at the time of the  Annual  Meeting  or any
postponements  or  adjournments,  the  Proxies  will be  voted  for  such  other
nominee(s)  as shall be designated by the current Board of Directors to fill any
vacancy.  We have no  reason  to  believe  that any  nominee  will be  unable or
unwilling to serve if elected as a director.

         The Board of Directors  proposes the election of the following nominees
as directors:

                              Jean-Pierre L. Conte
                             Leonard M. Hendrickson
                              David J. Moffa, Ph.D.
                              John R. Overturf, Jr.
                                Robert J. Weltman
                            John L. Zabriskie, Ph.D.

         If  elected,  each  nominee is  expected to serve until the 2004 Annual
Meeting of  Stockholders.  The six  nominees  for  election as  directors at the
Annual  Meeting  who receive the  highest  number of  affirmative  votes will be
elected.

         THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS A VOTE "FOR" THE ELECTION
OF THE NOMINEES LISTED ABOVE.


                                       2





INFORMATION WITH RESPECT TO NOMINEES AND CONTINUING DIRECTORS

         The following table sets forth certain  information with respect to the
director nominees of the Company as of May 15, 2003.

NAME                              AGE     POSITION
- ----                              ---     --------
Jean-Pierre L. Conte (1)           39     Chairman of the Board of Directors,
                                            Director and Director Nominee

Leonard M. Hendrickson             55     President and Chief Executive Officer,
                                            Director and Director Nominee

David J. Moffa, Ph.D. (1)(2)       60     Director and Director Nominee

John R. Overturf, Jr. (2)          42     Director and Director Nominee

Robert J. Weltman                  38     Director and Director Nominee

John L. Zabriskie, Ph.D. (1)(2)    63     Director and Director Nominee

- ----------
(1)      Member of the Compensation Committee.
(2)      Member of the Audit Committee.
- ----------

         Brief statements setting forth the principal  occupation and employment
during the past five  years,  the year in which first  elected as  director  and
other information concerning each nominee appear below.

         JEAN-PIERRE  L.  CONTE has served as a director  of the  Company  since
February 2000 and was appointed as Chairman in May 2001. Mr. Conte is a Managing
Director of Genstar  Capital LLC,  which is the sole general  partner of Genstar
Capital  Partners  II,  L.P.,  a private  equity  limited  partnership,  and the
Chairman  and  Managing  Director  of Genstar  Capital  L.P.,  which is the sole
general partner of Genstar  Capital  Partners III, L.P. Prior to joining Genstar
in 1995,  he was a  principal  for six years at the NTC Group,  Inc.,  a private
equity investment firm. He is a director of several private companies. Mr. Conte
earned a Masters of Business  Administration  from Harvard  University  Graduate
School of Business and a Bachelor of Arts from Colgate University. Mr. Conte has
been  appointed  to the  Board  of  Directors  pursuant  to an  investor  rights
agreement among Genstar, Stargen and us, which is described under "Relationships
and Related Transactions."

         LEONARD M. HENDRICKSON  became President and Chief Executive Officer on
October 15, 2001. He has been a director of BioSource since October 1993.  Prior
to his position as President  and Chief  Executive  Officer of the Company,  Mr.
Hendrickson was President of Isotope Products Laboratories from February 1992 to
October  2001.  He  also  held  senior  positions  with  Amersham,  Covance  and
Microchemics.  Mr.  Hendrickson  holds a Bachelor of Science  degree in Chemical
Engineering  from the  University  of  Pennsylvania  and a Masters  in  Business
Administration from American University in Washington, D.C.

         DAVID J. MOFFA,  PH.D.  has been a director of the Company  since April
1995. Dr. Moffa serves as the Regional Director and as special projects director
for Lab  Corporation  of  America,  Inc.  located in  Fairmont,  West  Virginia,
positions he has held since 1982 and 1984, respectively.  In addition, Dr. Moffa
currently  serves as a  Director  of  LabCorp  in  Pittsburgh,  Pennsylvania,  a
position  he has held since 1985 and is  Chairman  and CEO of  ClinServices  LLC
since  1999.  Dr.  Moffa also  serves as an advisor  and  consultant  to various
diagnostic,  scientific and health care  facilities.  Dr. Moffa also serves on a
number of committees and boards of directors of various privately held companies
and governmental  offices. Dr. Moffa has completed a post doctoral fellowship in
Clinical  Biochemistry at the West Virginia  University  National  Institutes of
Health,  holds a Ph.D. in Medical Biochemistry from the West Virginia University
School of  Medicine,  a Masters  of  Science  degree in  Biochemistry  from West
Virginia  University  and a Bachelor  of Arts degree in  Pre-Medicine  from West
Virginia University.

         JOHN  R.  OVERTURF,  JR.  has  been a  director  of the  Company  since
September 1993. Mr. Overturf serves as the President of R.O.I.,  Inc., a private
investment company, a position he has held since July 1993. He also serves as


                                       3






President of the  Combined  Penny Stock Fund,  Inc.,  a closed-end  stock market
fund,  a position  he has held since  August  1996.  From  September  1993 until
September 1996, Mr. Overturf served as Vice President of The Rockies Fund, Inc.,
a closed-end  stock market fund. Mr. Overturf holds a Bachelor of Science degree
in Finance from the University of Northern Colorado.

         ROBERT J. WELTMAN has served as a director of BioSource  since February
2000.  He is a Managing  Director of Genstar  Capital,  L.P.,  the sole  general
partner  of  Genstar  Capital  Partners  II,  L.P.,  a  private  equity  limited
partnership.  Mr.  Weltman  joined  Genstar  in August  1995.  Prior to  joining
Genstar,  from  July  1993 to July  1995,  Mr.  Weltman  was an  Associate  with
Robertson,  Stephens & Company, an investment banking firm. Mr. Weltman holds an
AB degree in Chemistry from Princeton University. Mr. Weltman has been appointed
to the  Board of  Directors  pursuant  to an  investor  rights  agreement  among
Genstar,  Stargen and us, which is described  under  "Relationships  and Related
Transactions."

         JOHN L.  ZABRISKIE,  PH.D. has served as a director of BioSource  since
July 2002. He is Co-founder and has served as Director of Puretech  Ventures,  a
venture  creation  company  since  2001.  From  1997 to 2000 Dr.  Zabriskie  was
Chairman  and Chief  Executive  Officer of NEN Life  Science  Products,  Inc., a
leading  supplier of kits for labeling and  detection of DNA. From 1995 to 1997,
Dr. Zabriskie was President and Chief Executive Officer of Pharmacia and Upjohn,
Inc., a Fortune 500 pharmaceutical  company formed by the merger of Pharmacia AB
of Sweden and the Upjohn Company of Kalamazoo, Michigan. From 1965 until joining
Upjohn in 1994,  Dr.  Zabriskie was employed by Merck and Co., Inc. He began his
career  at Merck as a  chemist  in 1965 and  held  various  positions  including
President of Merck Sharp & Dohme and Executive  Vice President of Merck and Co.,
Inc.  He has  served  on a  number  of  boards  for  health  care  and  academic
institutions  and  currently  serves on the Board of  Directors  of Kellogg Co.,
Cubist Pharmaceutical, Inc., Biomira, Inc., Array BioPharma, and MacroChem Corp.
Dr.  Zabriskie  received his A.B.  degree in Chemistry  from  Dartmouth  College
(N.H.)  in 1961 and his  Ph.D.  in  Organic  Chemistry  from the  University  of
Rochester (N.Y.) in 1965.

BOARD MEETINGS AND COMMITTEES

         The  Board of  Directors  held six  meetings  during  fiscal  2002.  No
director  attended  less than 75% of all the  meetings of the Board of Directors
and those committees on which he served in fiscal 2002.

         The Board of Directors  maintains an Audit Committee and a Compensation
Committee.  The Board of Directors does not maintain a Nominating Committee. The
Audit Committee currently consists of Messrs.  Moffa,  Overturf,  and Zabriskie.
Dr. Moffa was elected to the Audit  Committee on September  19, 2002,  replacing
Mr.  Weltman,  who resigned from the committee on September 19, 2002, due to his
affiliated status to the Company,  as defined under the current NASDAQ continued
listing  requirements  related  to  audit  committee  member  independence.  Dr.
Zabriskie was elected to the Audit Committee on April 22, 2003, replacing Robert
D. Weist,  who resigned  from our Board on April 22, 2003 for personal  reasons.
The  Audit  Committee  recommends  the  engagement  of  our  independent  public
accountants,  reviews the scope of the audit to be conducted by such independent
public  accountants,  and meets with the independent  public accountants and the
Chief Financial Officer to review matters relating to our financial  statements,
our accounting  principles and our system of internal accounting  controls,  and
reports its  recommendations  as to the approval of our financial  statements to
the Board of Directors. Six meetings of the Audit Committee were held during the
year ended December 31, 2002.

         The role and responsibilities of the Audit Committee are set forth in a
written Charter adopted by the Board of Directors.  The Audit Committee  reviews
and reassesses  the Charter  annually and recommends any changes to the Board of
Directors  for  approval.   After   reassessing  the  provisions  of  the  Audit
Committee's  prior  Charter,  and in light of recent  changes in the  securities
laws, the Audit Committee  recommended,  and the Board of Directors approved, an
Amended and Restated Audit Committee  Charter on April 22, 2003. The Amended and
Restated  Audit  Committee  Charter  is  attached  to this  proxy  statement  as
"Appendix A."

         The Compensation  Committee currently consists of Messrs.  Conte, Moffa
and  Zabriskie.  Dr.  Zabriskie  was elected to the  Compensation  Committee  on
September  19,  2002,  replacing  Leonard  Hendrickson,  who  resigned  from the
Compensation   Committee  on  July  3,  2002.  The  Compensation   Committee  is
responsible for considering and making recommendations to the Board of Directors
regarding executive  compensation and is responsible for administering our stock
option  and  executive  incentive  compensation  plans.  Eight  meetings  of the
Compensation Committee were held during the year ended December 31, 2002.


                                       4





COMPENSATION OF DIRECTORS

         Our  non-employee  corporate  directors,   except  for  Dr.  Zabriskie,
currently are paid $2,000 for each board meeting  attended,  and $1,000 per year
for service on a board committee. In addition,  non-employee  directors,  except
Dr. Zabriskie,  receive an annual grant of 4,000  non-statutory stock options in
December of each year,  exercisable at the fair market value of our common stock
on the date of grant,  and which fully vest on the date of grant.  Dr. Zabriskie
received  55,000 stock  options upon his  acceptance as a member of the Board of
Directors  of the  Company in July 2002.  20,000 of these stock  options  vested
immediately,  17,500  stock  options will vest on July 18, 2003 and 17,500 stock
options will vest on the date of the 2004 Annual  Meeting of  Stockholders.  Dr.
Zabriskie  does not receive cash  remuneration,  nor do we currently  anticipate
making any further  stock option  grants for his services on the Board.  We also
pay out of pocket  expenses  incurred by all of our directors in connection with
their attendance.

                             EXECUTIVE COMPENSATION

SUMMARY COMPENSATION TABLE

         The following table sets forth,  as to the Chief Executive  Officer and
as to each of the other four most highly compensated officers whose compensation
exceeded $100,000 during the last fiscal year (the "Named Executive  Officers"),
information  concerning  all  compensation  paid  for  services  to  us  in  all
capacities for each of the three years ended December 31 indicated below.


                           SUMMARY COMPENSATION TABLE


                                                ANNUAL COMPENSATION                LONG TERM COMPENSATION
                                 ----------------------------------------------    ----------------------
                                   YEAR                                OTHER       NUMBER OF
                                  ENDED                                ANNUAL      SECURITIES   ALL OTHER
NAME AND                         DECEMBER                              COMPEN-     UNDERLYING    COMPEN-
PRINCIPAL POSITION (1)              31,       SALARY        BONUS      SATION       OPTIONS      SATION
- ------------------------------   --------   ----------    ---------   ---------    ----------   ---------
                                                                              
Leonard M. Hendrickson........     2002     $250,000      $99,650     $ 1,548(4)           0
Chief Executive Officer and        2001       49,000(2)    90,000(3)      173(4)     280,000
President

David Thrower.................     2002     $124,506(5)   $     0     $14,053(6)           0
Senior Vice President,             2001      200,000       23,000         324(4)     110,000
Sales and Marketing                2000       28,750(5)     8,750          27(4)     235,000    $13,224(7)

Charles C. Best...............     2002     $166,400      $59,023         324(4)           0
Chief Financial Officer            2001      160,000       23,500         325(4)      87,500
and Executive Vice President       2000      142,200       22,500         489(4)      20,000

- ----------
<FN>
(1)      For a description of employment  agreements  between certain  executive
         officers and the Company,  see  "Employment  Agreements  with Executive
         Officers" below.
(2)      Mr. Hendrickson joined the Company on October 15, 2001.
(3)      Mr. Hendrickson received a signing bonus on October 15, 2001
(4)      Consists of group life insurance premiums paid by the Company.
(5)      Mr.  Thrower  joined the Company on November 1, 2000 and resigned  from
         the Company on July 26, 2002.
(6)      Consists  of $13,685  of  accrued  vacation  paid by the  Company  upon
         termination  and $188 for a group life  insurance  premium  paid by the
         Company.
(7)      Relocation expenses.
</FN>



                                       5





OPTION GRANTS IN LAST FISCAL YEAR

No grants of stock  options were made during the fiscal year ended  December 31,
2002 to the Named Executive Officers.

OPTION EXERCISES AND STOCK OPTIONS HELD AT FISCAL YEAR END

The  following  table sets forth,  for those Named  Executive  Officers who held
stock  options  at  fiscal  year  end,  certain  information  regarding  options
exercised  in fiscal  year 2002,  if any,  the number of shares of common  stock
underlying  stock  options held and the value of options held at fiscal year end
based  upon the last  reported  sales  price of the  common  stock on the NASDAQ
market on December 31, 2002 ($5.99 per share).



          AGGREGATED OPTION EXERCISES AND FISCAL YEAR-END OPTION VALUES

                            SHARES                  NUMBER OF SECURITIES
                           ACQUIRED                UNDERLYING UNEXERCISED         VALUE OF UNEXERCISED
                              ON       VALUE             OPTIONS AT              IN-THE-MONEY OPTIONS AT
NAME                       EXERCISE   REALIZED       DECEMBER 31, 2002              DECEMBER 31, 2002
- ----                       --------   --------       -----------------              -----------------
                             (#)        ($)      EXERCISABLE  UNEXERCISABLE    EXERCISABLE   UNEXERCISABLE
                             ---        ---      -----------  -------------    -----------   -------------
                                                                              
Leonard M. Hendrickson...    --         --        140,666        198,334         $191,163       $198,334
Charles C. Best..........    --         --         62,124         71,786           48,450          7,500



                                       6





EMPLOYMENT AGREEMENTS WITH EXECUTIVE OFFICERS

         We  have  entered  into  an  employment   agreement   with  Leonard  M.
Hendrickson to serve as our President and Chief Executive Officer,  effective as
of October 15, 2001.  Pursuant to this  agreement  Mr.  Hendrickson  receives an
annual base  salary of  $250,000,  which we may  increase,  at the Board's  sole
discretion,  at the end of each year of his employment.  In addition to the base
salary to be paid to Mr. Hendrickson,  the Company paid a one time signing bonus
to him in the amount of $90,000  upon the  commencement  of his  employment.  In
addition,  Mr.  Hendrickson  is  eligible  to receive an annual  bonus under the
Company's  management  incentive plan. The agreement  terminates on December 31,
2004. In the event that Mr. Hendrickson's employment is terminated without cause
or due to a "change of control" during the term of the agreement, the Company is
obligated to continue paying Mr.  Hendrickson's  then-current  base salary for a
period of 12 months following the effective date of such  termination.  Also, in
certain instances  involving a "change of control," all stock options which have
been granted to Mr.  Hendrickson that are unvested at the time of such change of
control  shall  become  immediately  vested and  exercisable.  According  to our
agreement with Mr.  Hendrickson,  a "change of control" occurs if (i) any person
or entity (or group of related persons or entities  acting in concert)  acquires
shares of capital  stock of the Company  entitled to exercise 35% or more of the
total voting  power  represented  by all shares of capital  stock of the Company
then  outstanding;  or (ii) the  Company  enters  into an  agreement  to sell or
otherwise  transfer  all or  substantially  all of its assets or enters  into an
agreement to merge,  consolidate  or reorganize  with any other  corporation  or
entity,  as the  result  of  which  less  than  75% of the  total  voting  power
represented by the capital stock or other equity interests of the corporation or
entity to which the Company's  assets are sold or  transferred or surviving such
merger, consolidation or reorganization are held by the persons and entities who
were holders of common stock of the Company immediately prior to such agreement;
or (iv) the Company issues otherwise than on a pro rata basis additional  shares
of capital stock  representing  (after giving effect to such issuance) more than
35% of the total voting  power of the  Company;  or (v) the persons who were the
directors  of the Company as of October 15, 2001 cease to comprise a majority of
the Board of Directors of the Company.

         Effective as of December 17, 1999, Charles C. Best, our Chief Financial
Officer, entered into a separation agreement with us. In the event we experience
a "change of control," and the  employment of Mr. Best is terminated  within one
year of the "change of  control,"  we are  obligated to continue to pay Mr. Best
his  then-current  base salary for a period of 12 months following the effective
date of such  termination.  For purposes of Mr. Best's separation  agreement,  a
"change of control"  occurs if (i) any person or entity  acquires  shares of our
capital stock  entitled to exercise 35% or more of the total voting power of our
stockholders,  (ii) we enter into an agreement to sell or otherwise transfer all
or  substantially  all of our  assets or to effect a  merger,  consolidation  or
reorganization with any other corporation or entity,  which results in less than
75% of the total voting power  represented  by the capital stock or other equity
interests  of the  corporation  or  entity  to  which  our  assets  are  sold or
transferred or surviving such merger, consolidation or reorganization being held
by the persons and entities  who were  holders of our common  stock  immediately
prior to such  agreement,  (iii) we issue,  otherwise  than on a pro rata basis,
additional  shares of capital  stock  representing  (after giving effect to such
issuance) more than 35% of the total voting power of our  stockholders,  or (iv)
if the persons who were our directors as of the date of the separation agreement
cease to comprise a majority of our Board of Directors.

         Effective May 18, 2001, David Thrower, our former Senior Vice President
of Sales and  Marketing,  entered  into a separation  agreement  with us. In the
event the Company  terminated Mr.  Thrower's  employment  with the Company other
than for cause at any time (i) prior to July 15, 2002, or (ii) within six months
following  a "change  of  control,"  we were  required  to pay Mr.  Thrower  his
then-current  base salary for a period of 12 months following the effective date
of  such  termination.  In  addition,  if  the  employment  of Mr.  Thrower  was
terminated  within six months of a "change of control,"  all stock options which
had been granted to Mr. Thrower that were unvested at the time of such change of
control would have become immediately  vested and exercisable.  According to our
agreement with Mr. Thrower, a "change of control" was defined as the acquisition
by any person or entity  unaffiliated  with Genstar Capital LLC of capital stock
representing at least 40% of the total fully diluted shares of the Company.  Mr.
Thrower  resigned  from the  Company on July 26, 2002 and did not receive any of
the described compensation.


                                       7





           COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

         The Compensation  Committee  currently  consists of Messrs.  Zabriskie,
Moffa and Conte. Dr.  Zabriskie  joined the Compensation  Committee on September
19, 2002,  replacing  Leonard  Hendrickson,  who resigned from the  Compensation
Committee  on July 3,  2002.  The  Compensation  Committee  is  responsible  for
considering  and  making  recommendations  to the Board of  Directors  regarding
executive  compensation and is responsible for  administrating  our stock option
and  executive  incentive  compensation  plans.  None  of  the  members  of  the
Compensation  Committee is a current officer or employee of the Company. None of
our executive officers or Directors served as a member of the board of directors
of any other  entity of which an  executive  officer or  Director  served on our
Board of Directors.

                          COMPENSATION COMMITTEE REPORT

         The  Compensation  Committee  of  the  Board  of  Directors  determines
compensation paid to each of our executive officers and administers our Plans.

         The  objectives  of  our  executive  compensation  policy  include  (1)
attracting,   motivating   and  retaining   talented   executives  by  providing
compensation  that is competitive  with  comparable  companies,  (2) maintaining
compensation levels that are consistent with the company's financial  objectives
and operating  performance and (3) aligning the interests of executive  officers
and  stockholders  through  bonuses  based on the company's  performance  and by
providing equity  compensation.  Our compensation  program currently consists of
base salary and incentive  compensation in the form of cash bonuses and/or stock
options.

         In  arriving at an initial  compensation  offer to an  individual,  the
Compensation  Committee considers  determinants of the individual's market value
including experience, education,  accomplishments and reputation, as well as the
level of responsibility  to be assumed,  in relation to the market value of such
qualifications and industry standards.  When determining  subsequent adjustments
to an individual's annual salary, the Compensation  Committee also evaluates the
importance to stockholders of that person's continued service.  The Compensation
Committee also reviews the annual salaries of our executive officers in relation
to the company's financial performance,  annual budgeted financial goals and its
position  in  the  industry.  This  is a  judgment  process,  exercised  by  the
Compensation Committee with the advice of management and other consultants.

         Cash bonuses were awarded during the past year,  which were  determined
on the basis of  accomplishments  measured  against a management  incentive plan
that was  prepared by  management  and approved by the  Compensation  Committee.
Stock options are  prospective  incentives,  aimed at keeping and motivating key
people by letting them share in the value they create for stockholders. They are
awarded at times deemed  appropriate  by the  Compensation  Committee in amounts
intended to secure the full attention and best efforts of executives  upon whose
future performance the company's success will depend.

         Effective as of October 15,  2001,  Leonard M.  Hendrickson  became the
Company's  President and Chief  Executive  Officer.  In 2002, Mr.  Hendrickson's
annual base salary was $250,000.  The Committee may increase this  compensation,
in its sole discretion,  at the end of each year of his employment.  In addition
to the base salary paid to Mr. Hendrickson,  the Company paid a one time signing
bonus to him in the amount of $90,000 upon the commencement of his employment in
2001. In connection  with his initial  engagement,  the Company also granted Mr.
Hendrickson  options to purchase  280,000 shares of the Company's  common stock.
Mr.   Hendrickson's   compensation   package  was  established  based  upon  the
Compensation  Committee's comparative analysis of other similarly situated chief
executive  officers,  review of Mr.  Hendrickson's prior experience and expected
contributions,  and  consideration of the relative  importance of his respective
position in terms of  achieving  the  Company's  objectives,  Additionally,  the
Compensation Committee consulted with a professional  recruiting firm hired as a
consultant  to the Company to assist in the process of retaining a new President
and Chief Executive Officer. Mr. Hendrickson also participates in the management
incentive plan approved by the Compensation Committee.

                                                 COMPENSATION COMMITTEE

                                                 David J. Moffa, Ph.D.
                                                 Jean-Pierre L. Conte
                                                 Leonard M. Hendrickson (1)
                                                 John L. Zabriskie, Ph.D. (2)

(1)      Resigned from the compensation committee on July 3, 2002
(2)      Elected to the compensation committee on September 19, 2002


                                       8





                          REPORT OF THE AUDIT COMMITTEE

         In  accordance  with  its  written  charter  adopted  by the  Board  of
Directors,   the  Audit   Committee   assists  the  Board  in   fulfilling   its
responsibility  for  oversight of the quality and  integrity of the  accounting,
auditing and financial reporting practices of the Company. All of the members of
the  Audit  Committee  are  independent  (as  independence  is  defined  in Rule
4200(a)(15)  of  the  National   Association  of  Securities   Dealers'  listing
standards).

         In discharging its  responsibility  for oversight of the audit process,
the Audit Committee obtained from the independent  auditors,  KPMG LLP, a formal
written  statement  describing  any  relationships  between the auditors and the
Company  that  might  bear on the  auditors'  independence  consistent  with the
Independent Standards Board Standard No. 1, "Independence Discussions with Audit
Committees," discussed with the auditors any relationships that might impact the
auditors'  objectivity and independence and satisfied itself as to the auditors'
independence.

         The  Audit  Committee  discussed  and  reviewed  with  the  independent
auditors the communications  required by generally accepted auditing  standards,
including those described in Statement on Auditing Standards No. 61, as amended,
"Communication  with Audit Committees" and discussed and reviewed the results of
the independent  auditors'  examination of the financial statements for the year
ended December 31, 2002.

         The Committee reviewed the audited financial  statements of the Company
as of and for the fiscal year ended December 31, 2002,  with  management and the
independent  auditors.  Management has the responsibility for preparation of the
Company's   financial   statements  and  the   independent   auditors  have  the
responsibility   for   examination   of  those   statements.   Based   upon  the
above-mentioned  review and  discussions  with  management  and the  independent
auditors,  the  Audit  Committee  recommended  to the Board  that the  Company's
audited  financial  statements be included in its Annual Report on Form 10-K for
the fiscal year ended December 31, 2002, for filing with the Securities Exchange
Commission (the "SEC").

                                                 AUDIT COMMITTEE

                                                 John R. Overturf, Jr.
                                                 Robert J. Weltman (1)
                                                 Dave Moffa (2)
                                                 Robert D. Weist (3)
                                                 John L. Zabriskie, Ph.D. (4)


(1)      Resigned from the Audit Committee on September 19, 2002
(2)      Elected to the Audit Committee on September 19, 2002
(3)      Resigned from the Board of Directors  and the Audit  Committee on April
         22, 2003
(4)      Elected  to the Board of  Directors  on July 17,  2002 and to the Audit
         Committee on April 22, 2003


                                       9





SECTION 16(A) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

         Section  16(a) of the  Securities  Exchange  Act of 1934,  requires our
executive  officers,  directors,  and persons who own more than ten percent of a
registered  class of our equity  securities  to file  reports of  ownership  and
changes in ownership with the Securities  and Exchange  Commission  (the "SEC").
Executive  officers,  directors and  greater-than-ten  percent  stockholders are
required  by SEC  regulations  to furnish us with all  Section  16(a) forms they
file.  Based solely on our review of the copies of the forms  received by us and
written  representations  from certain reporting persons that they have complied
with the relevant filing  requirements,  we believe that,  during the year ended
December 31, 2002, all our executive  officers,  directors and  greater-than-ten
percent stockholders complied with all Section 16(a) filing requirements, except
for the  following;  Robert D. Weist,  who resigned from the Board in April 2003
filed two late Form 4s, each  reporting  late one  transaction  that occurred in
November 2002 and December  2002,  respectively;  and each of John R.  Overturf,
Jr., David J. Moffa,  Jean-Pierre L. Conte, and Robert J. Weltman filed one late
Form 4, each reporting late one  transaction  that occurred for each in December
2002.


                     RELATIONSHIPS AND RELATED TRANSACTIONS
                      WITH DIRECTORS AND EXECUTIVE OFFICERS

         Since  the  beginning  of our last  fiscal  year,  there  have  been no
transactions,  including  loans  or  other  indebtedness,  to  which  we or  our
subsidiaries  were a  party,  and in  which  any  of  our  directors,  officers,
significant  beneficial  owners,  or the  respective  families of the  foregoing
persons,  had a direct or indirect material  interest.  No such transactions are
currently proposed.


                                       10





                                PERFORMANCE GRAPH

         The  following  graph sets forth the  percentage  change in  cumulative
total shareholder return of our common stock during the period from December 31,
1996 to December 31, 2002,  compared with the  cumulative  returns of the Nasdaq
Stock Market (U.S. Companies) Index, the JP Morgan H & Q Biotechnology Index and
the NASDAQ  Biotechnology  index.  The  comparison  assumes $100 was invested on
December 31, 1996 in our common stock and in each of the foregoing indices.  The
stock price performance on the following graph is not necessarily  indicative of
future stock price performance.


                          [PERFORMANCE GRAPH OMITTED]





BIOSOURCE INTL INC
                                                        Cumulative Total Return
                                  ----------------------------------------------------------------
                                   12/96    12/97     12/98     12/99     12/00    12/01     12/02

                                                                       
BIOSOURCE INTERNATIONAL, INC.     100.00    92.73     42.73    115.46    222.73   120.73     87.13
NASDAQ STOCK MARKET (U.S.)        100.00   122.49    172.70    320.29    192.82   152.97    105.74
JP MORGAN H & Q BIOTECHNOLOGY     100.00   101.22    154.14    329.48    354.22   294.61
NASDAQ BIOTECHNOLOGY              100.00   104.48    163.01    376.13    470.24   393.67    244.65



                                       11





                                 PROPOSAL NO. 2:
                           RATIFICATION OF APPOINTMENT
                             OF INDEPENDENT AUDITORS


         The Audit Committee of the Board of Directors recommended and the Board
has selected,  subject to ratification by a majority vote of the shareholders in
person or by proxy at the Annual  Meeting,  the firm of KPMG LLP to  continue as
our  independent  public  accountant for the current fiscal year ending December
31, 2003. KPMG has served as the principal  independent  public  accounting firm
utilized  by us during the years  ended  December  31,  1994  through  2002.  We
anticipate that a representative  of KPMG will attend the Annual Meeting for the
purpose  of  responding  to  appropriate  questions.  At the Annual  Meeting,  a
representative  of KPMG will be afforded an  opportunity  to make a statement if
they so desire.


         The following  table  presents  fees for  professional  audit  services
rendered by KPMH LLP for the audit of the  Company's  financial  statements  for
2001 and 2002, and fees billed for other services rendered by KPMG LLP.

                                                    2002        2001
                                                  --------    --------
          Audit fees .........................    $160,250    $144,943

          Audit related fees (1) .............           0      23,847
                                                  --------    --------
                   Audit and related fees ....     160,250     168,790

          Tax fees (2) .......................     108,572      37,898

          All other fees .....................           0           0
                                                  --------    --------
                   Total fees ................    $268,822    $206,688
                                                  ========    ========
- ----------
(1)      Audit  related  fees  consist  principally  of  fees  for  certain  due
         diligence services
(2)      Tax fees  consisted  of fees for tax  consultation  and tax  compliance
         services

         The  Audit  Committee  of the  Board  of  Directors  has  reviewed  and
considered  whether the provision of services other than those services  related
to the audit of the annual  financial  statements  and reviews of the  quarterly
financial  statements is compatible with maintaining KPMG's  independence as our
principal independent accounting firm.

         THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS A VOTE "FOR" PROPOSAL NO.
2 RATIFYING THE APPOINTMENT OF KPMG, LLP AS OUR INDEPENDENT AUDITORS.


                                       12





                                OTHER INFORMATION

PRINCIPAL STOCKHOLDERS

The following table sets forth as of May 15, 2003 certain  information  relating
to the  ownership  of our common  stock by (i) each person known by us to be the
beneficial  owner of more than five  percent  of the  outstanding  shares of our
common stock, (ii) each of our directors,  (iii) each of our executive officers,
and (iv) all of our executive  officers and directors as a group.  Except as may
be indicated in the footnotes to the table and subject to  applicable  community
property laws,  each such person has the sole voting and  investment  power with
respect to the shares owned.  Unless  otherwise  indicated,  the address of each
person  listed is in care of  BioSource  International,  Inc.,  542 Flynn  Road,
Camarillo,  California  93012,  and the  address of Messrs.  Conte,  Weltman and
Genstar  Capital LLC is Four  Embarcadero  Center,  Suite 1900,  San  Francisco,
California 94111.
                                           NUMBER OF SHARES
                                           OF COMMON STOCK
                                             BENEFICIALLY
            NAME AND ADDRESS                  OWNED (1)          PERCENT (1),(2)
            ----------------               ----------------      ---------------

Genstar Capital LLC (3)................        3,444,856               31.7%
Jean-Pierre L. Conte (3)...............        3,396,189               31.3%
Kennedy Capital Management, Inc. (4)...          759,428                7.9%
Dimensional Funds Advisors Inc. (5)....          595,300                6.2%
Royce & Associates LLC (6)                       580,000                6.1%
Bricoleur Capital Management LLC (7)             493,510                5.2%
Leonard M. Hendrickson (8).............          233,499                2.4%
John L. Zabriskie, Ph.D. (9)                      35,000                 *
David J. Moffa, Ph.D. (10).............           43,900                 *
John R. Overturf, Jr. (11).............           29,600                 *
Robert J. Weltman (12).................           15,333                 *
Charles C. Best (13)...................           81,602                 *
All of the directors  and  executive
   officers as a group (14)............        3,835,123               34.2%

- ----------
* Less than one percent.

(1)      Under Rule 13d-3, certain shares may be deemed to be beneficially owned
         by more than one person (if,  for example,  persons  share the power to
         vote or the power to dispose of the shares).  In  addition,  shares are
         deemed to be beneficially owned by a person if the person has the right
         to acquire the shares (for example,  upon exercise of an option) within
         60 days  of the  date as of  which  the  information  is  provided.  In
         computing the percentage  ownership of any person, the amount of shares
         outstanding  is deemed to  include  the  amount of shares  beneficially
         owned  by such  person  (and  only  such  person)  by  reason  of these
         acquisition  rights. As a result,  the percentage of outstanding shares
         of any person as shown in this table does not  necessarily  reflect the
         person's actual ownership or voting power with respect to the number of
         shares of common stock actually outstanding at May 15, 2003.
(2)      Percentage  ownership  is based on  9,555,955  shares of  common  stock
         outstanding as of May 15, 2003.
(3)      Genstar  Capital  Partners II, L.P.  holds  2,032,809  shares of common
         stock and  1,262,542  shares of common stock  issuable upon exercise of
         warrants  and Stargen II LLC holds  34,380  shares of common  stock and
         24,458 shares of common stock  issuable upon exercise of warrants,  all
         of which are currently  convertible  or  exercisable.  Includes  12,000
         stock  options held by Mr.  Conte and 12,000 stock  options held by Mr.
         Weltman.  In addition,  Mr. Conte holds 30,000  shares of common stock,
         Richard F. Hoskins  holds 16,667 shares of common  stock,  Mr.  Weltman
         holds  3,333  shares of common  stock,  and Richard D.  Paterson  holds
         16,667  shares of common  stock.  Genstar  Capital  LLC is the  general
         partner of Genstar Capital Partners II, L.P. Mr. Conte, Mr. Hoskins and
         Mr. Paterson are the managers and managing directors of Genstar Capital
         LLC and are members of Stargen,  and Mr. Paterson is the Administrative
         Member of  Stargen.  In such  capacities  Messrs.  Conte,  Hoskins  and
         Paterson  may be  deemed to  beneficially  own  shares of common  stock
         beneficially held by Genstar Capital Partners and Stargen, but disclaim
         such  beneficial  ownership,  except to the  extent  of their  economic
         interest in these shares.


                                       13





         Messrs. Conte, Hoskins,  Paterson, Genstar Capital LLC, Genstar Capital
         Partners  II,  L.P.  and Stargen II LLC may be deemed to be acting as a
         group in relation to their respective  holdings in BioSource but do not
         affirm the existence of any such group.
(4)      As disclosed in the Schedule 13G filed with the Securities and Exchange
         Commission on February 14, 2003 by Kennedy Capital Management, Inc.
(5)      As disclosed in the Schedule 13G filed with the Securities and Exchange
         Commission on February 3, 2003 by Dimensional Fund Advisors, Inc.
(6)      As disclosed in the Schedule 13G filed with the Securities and Exchange
         Commission on February 3, 2003 by Royce & Associates LLC.
(7)      As disclosed in the Schedule 13G filed with the Securities and Exchange
         Commission on February12, 2003 by Bricoleur Capital Management LLC.
(8)      Includes (i) 181,499  shares of common stock reserved for issuance upon
         exercise  of  stock  options  that  are  currently  exercisable  or are
         exercisable  within  60 days of May 15,  2003;  (ii)  48,000  shares of
         common  stock  owned;  and (iii) 4,000  shares of common  stock held of
         record by two of Mr. Hendrickson's minor children;
(9)      Includes  20,000  shares of common stock  reserved  for  issuance  upon
         exercise  of  stock  options  that  are  currently  exercisable  or are
         exercisable within 60 days of May 15, 2003.
(10)     Includes (i) 36,500  shares of common stock  reserved for issuance upon
         exercise  of  stock  options  that  are  currently  exercisable  or are
         exercisable  within 60 days of May 15, 2003;  (ii) 550 shares of common
         stock held solely by Dr. Moffa's  spouse;  (iii) 4,000 shares of common
         stock held jointly with Dr.  Moffa's  spouse;  and (iv) 2,850 shares of
         common stock held directly.
(11)     Includes (i) 24,000  shares of common stock  reserved for issuance upon
         exercise  of  stock  options  that  are  currently  exercisable  or are
         exercisable  within 60 days of May 15,  2003;  and (ii) 5,600 shares of
         common stock owned.
(12)     Includes (i) 3,333 shares of common  stock held  directly;  (ii) 12,000
         shares of common stock  reserved for  issuance  upon  exercise of stock
         options that are currently  exercisable  or are  exercisable  within 60
         days of May 15,  2003.  Mr.  Weltman  is also a  Principal  of  Genstar
         Capital LP and a member,  but not a managing member, of Stargen II LLC.
         Mr. Weltman does not have power to vote or dispose of, or to direct the
         voting or disposition of, any securities  beneficially owned by Genstar
         Capital  LLC  or  Stargen  II  LLC.  Mr.  Weltman   disclaims  that  he
         beneficially  owns any  shares of common  stock  beneficially  owned by
         Genstar  Capital  LLC or  Stargen  II LLC,  except to the extent of his
         economic  interest in shares owned by Genstar Capital LLC or Stargen II
         LLC.
(13)     Includes  81,602  shares of common stock  reserved  for  issuance  upon
         exercise  of  stock  options  that  are  currently  exercisable  or are
         exercisable within 60 days of May 15, 2003.
(14)     Includes (i) 367,601  shares of common stock reserved for issuance upon
         exercise  of  stock  options  that  are  currently  exercisable  or are
         exercisable  within 60 days of May 15, 2003;  (ii) 1,287,000  shares of
         common stock  reserved  for issuance  upon the exercise of warrants and
         (iii) includes 2,180,522 shares of common stock owned.


                                       14





                              STOCKHOLDER PROPOSALS

         Pursuant to Rule 14a-8 under the  Securities  Exchange Act of 1934,  as
amended,  promulgated  by the SEC,  any  stockholder  of record  who  intends to
present a proposal at the next Annual Meeting of  Stockholders  for inclusion in
our Proxy  Statement and Proxy form relating to such Annual  Meeting must submit
such proposal to us at our principal executive offices no later than February 6,
2004. In order for proposals by  stockholders  not submitted in accordance  with
Rule 14a-8 to have been  timely  within the meaning of Rule  14a-4(c)  under the
Securities  Exchange  Act of 1934,  as  amended,  that  proposal  must have been
submitted so that it is received no later than April 21, 2004.  In addition,  in
the event a  stockholder  proposal is not received by us by April 21, 2004,  the
Proxy to be solicited by the Board of Directors for the next Annual Meeting will
confer discretionary authority on the holders of the Proxy to vote the shares if
the proposal is presented at the next Annual  Meeting  without any discussion of
the proposal in the Proxy Statement for such meeting.


                             SOLICITATION OF PROXIES

         It is expected  that the  solicitation  of proxies will be primarily by
mail.  The cost of  solicitation  by  management  will be  borne by us.  We will
reimburse  brokerage firms and other persons  representing  beneficial owners of
shares for their reasonable disbursements in forwarding solicitation material to
such  beneficial  owners.  Proxies  may  also be  solicited  by  certain  of our
directors and officers, without additional compensation,  personally or by mail,
telephone, telegram or otherwise for the purpose of soliciting such proxies.


                           ANNUAL REPORT ON FORM 10-K

         OUR  ANNUAL  REPORT  ON FORM  10-K,  WHICH  HAS  BEEN  FILED  WITH  THE
SECURITIES AND EXCHANGE COMMISSION FOR THE YEAR ENDED DECEMBER 31, 2002, WILL BE
MADE AVAILABLE TO STOCKHOLDERS WITHOUT CHARGE UPON WRITTEN REQUEST TO CHARLES C.
BEST, CHIEF FINANCIAL OFFICER,  BIOSOURCE  INTERNATIONAL,  INC., 542 FLYNN ROAD,
CAMARILLO, CALIFORNIA 93012



                                            ON BEHALF OF THE BOARD OF DIRECTORS


                                             /S/ CHARLES C. BEST
                                            ------------------------------------
                                            Charles C. Best
                                            CHIEF FINANCIAL OFFICER AND
                                              EXECUTIVE V.P., FINANCE





Camarillo, California
May 21, 2003


                                       15





                                   APPENDIX A


                              AMENDED AND RESTATED
                         CHARTER OF THE AUDIT COMMITTEE
                            OF THE BOARD OF DIRECTORS
                        OF BIOSOURCE INTERNATIONAL, INC.

         This Charter identifies the purpose, composition, meeting requirements,
committee responsibilities,  annual evaluation procedures and investigations and
studies of the Audit Committee (the  "COMMITTEE") of the Board of Directors (the
"BOARD")  of  BioSource   International,   Inc.,  a  Delaware  corporation  (the
"COMPANY").

I.       PURPOSE

         The  Committee  has been  established  to:  (a) assist the Board in its
oversight   responsibilities  regarding  (1)  the  integrity  of  the  Company's
financial  statements,  (2) the Company's  compliance  with legal and regulatory
requirements,  (3) the independent accountant's  qualifications and independence
and (4) the Company's internal and disclosure  controls;  (b) prepare the report
of the audit  committee  required by the United States  Securities  and Exchange
Commission  (the "SEC") for inclusion in the Company's  annual proxy  statement;
(c) retain and terminate the Company's independent accountant; (d) approve audit
and non-audit  services to be performed by the independent  accountant;  and (e)
perform  such other  functions  as the Board may from time to time assign to the
Committee.  In performing  its duties,  the Committee  shall seek to maintain an
effective working  relationship  with the Board, the independent  accountant and
management of the Company.

II.      COMPOSITION

         The  Committee  shall be composed of at least three,  but not more than
five,  members  (including  a  Chairperson),  all of whom shall be  "independent
directors," as such term is defined in the rules and  regulations of the SEC and
the Nasdaq National Market System  ("NASDAQ").  The members of the Committee and
the Chairperson  shall be selected by the Board and serve at the pleasure of the
Board.  A Committee  member  (including the  Chairperson)  may be removed at any
time, with or without cause,  by the Board.  The Board may designate one or more
independent directors as alternate members of the Committee, who may replace any
absent or  disqualified  member or members at any meetings of the Committee.  No
person  may be made a  member  of the  Committee  if his or her  service  on the
Committee  would  violate  any  restriction  on  service  imposed by any rule or
regulation  of the SEC or any  securities  exchange or market on which shares of
the common  stock of the Company  are traded.  The  Chairperson  shall  maintain
regular communication with the chief executive officer,  chief financial officer
and the lead partner of the independent accountant.

         All  members of the  Committee  shall have a working  familiarity  with
basic  finance  and  accounting  practices  and be able to read  and  understand
financial  statements,  and at least  one  member  of the  Committee  shall be a
"financial  expert." A member shall be deemed a "financial  expert" if the Board
determines  that such person has,  through  education and experience as a public
accountant  or  auditor,  or  a  principal  financial  officer,  controller,  or
principal  accounting officer of a company that at the time the person held such
position was required to file periodic reports with SEC, or experience in one or
more  positions  that  involve the  performance  of similar  functions  (or that
results,  in the judgment of the Board,  in the person having similar  expertise
and experience), the following attributes:

         o        An understanding of generally accepted  accounting  principles
                  and financial statements;

         o        Experience   applying  such  generally   accepted   accounting
                  principles in connection  with the  accounting  for estimates,
                  accruals,  and reserves that are  generally  comparable to the
                  estimates,  accruals,  and  reserves,  if  any,  used  in  the
                  registrant's financial statements;

         o        Experience  preparing or auditing  financial  statements  that
                  present  accounting  issues that are  generally  comparable to
                  those raised by the registrant's financial statements;

         o        Experience with internal controls and procedures for financial
                  reporting; and

         o        An understanding of audit committee functions.


                                       16





         Committee  members  may  enhance  their  familiarity  with  finance and
accounting by participating in educational  programs conducted by the Company or
an outside consultant.

         Except for Board and Committee  fees, a member of the  Committee  shall
not be permitted to accept any fees paid directly or indirectly  for services as
a consultant, legal advisor or financial advisor or any other fees prohibited by
the rules of the SEC and Nasdaq. In addition,  no member of the Committee may be
an "affiliated  person" of the Company or any of its  subsidiaries (as such term
is defined by the SEC).  Members of the  Committee  may receive  their Board and
Committee fees in cash, Company stock or options or other in-kind  consideration
as determined by the Board or the  Compensation  Committee,  as  applicable,  in
addition to all other benefits that other directors of the Company  receive.  No
director may serve on the Committee,  without the approval of the Board, if such
director  simultaneously serves on the audit committee of more than three public
companies.

III.     MEETING REQUIREMENTS

         The  Committee  shall meet as  necessary,  but at least  quarterly,  to
enable it to fulfill its responsibilities.  The Committee shall meet at the call
of any member of the  Committee,  preferably in  conjunction  with regular Board
meetings.  The Committee may meet by telephone  conference  call or by any other
means permitted by law or the Company's Bylaws. A majority of the members of the
Committee shall constitute a quorum.  The Committee shall act on the affirmative
vote of a majority of members present at a meeting at which a quorum is present.
Without a meeting,  the  Committee may act by unanimous  written  consent of all
members.  The Committee shall determine its own rules and procedures,  including
designation of a chairperson pro tempore, in the absence of the Chairperson, and
designation of a secretary.  The secretary need not be a member of the Committee
and shall attend  Committee  meetings and prepare  minutes.  The Committee shall
keep written minutes of its meetings,  which shall be recorded or filed with the
books and records of the Company. Any member of the Board shall be provided with
copies of such Committee minutes if requested.

         The  Committee  may  ask  members  of  management,  employees,  outside
counsel,  the  independent  accountant  or others  whose  advice and counsel are
relevant to the issues then being  considered  by the  Committee,  to attend any
meetings and to provide such pertinent information as the Committee may request.

         The Chairperson of the Committee shall be responsible for leadership of
the  Committee,   including  preparing  the  agenda,  presiding  over  Committee
meetings,  making Committee assignments and reporting the Committee's actions to
the Board from time to time (but at least once each  year) as  requested  by the
Board.

         As part of its  responsibility  to foster free and open  communication,
the Committee  should meet  periodically  with  management  and the  independent
accountant  in separate  executive  sessions  to discuss  any  matters  that the
Committee  or any of these groups  believe  should be  discussed  privately.  In
addition,  the  Committee  or at least  its  Chairperson  should  meet  with the
independent   accountant  and  management  quarterly  to  review  the  Company's
financial   statements  prior  to  their  public  release  consistent  with  the
provisions  set forth below in SECTION IV. The Committee may also meet from time
to time with the Company's investment bankers,  investor relations professionals
and financial analysts who follow the Company.

IV.      COMMITTEE RESPONSIBILITIES

         In carrying  out its  responsibilities,  the  Committee's  policies and
procedures should remain flexible to enable the Committee to react to changes in
circumstances  and conditions so as to ensure the Company  remains in compliance
with  applicable  legal and regulatory  requirements.  In addition to such other
duties as the Board may from time to time assign,  the Committee  shall have the
following responsibilities:

         A.       OVERSIGHT OF THE FINANCIAL REPORTING PROCESSES

                  1.       In consultation  with the independent  accountant and
                           management,    review    the    integrity    of   the
                           organization's  financial reporting  processes,  both
                           internal and external.

                  2.       Review and  approve all  related-party  transactions,
                           unless such  responsibility  has been reserved to the
                           full Board or delegated  to another  committee of the
                           Board.


                                       17





                  3.       Consider the independent accountant's judgments about
                           the  quality  and  appropriateness  of the  Company's
                           accounting  principles  as applied  in its  financial
                           reporting. Consider alternative accounting principles
                           and estimates.

                  4.       Annually review major issues  regarding the Company's
                           auditing and accounting  principles and practices and
                           its presentation of financial  statements,  including
                           the adequacy of internal  controls and special  audit
                           steps adopted in light of material  internal  control
                           deficiencies.

                  5.       Discuss with  management and legal counsel the status
                           of pending litigation,  taxation matters,  compliance
                           policies and other areas of oversight  applicable  to
                           the legal and compliance area as may be appropriate.

                  6.       Meet at  least  annually  with  the  chief  financial
                           officer and the  independent  accountant  in separate
                           executive sessions.

                  7.       Review all analyst  reports and press  articles about
                           the Company's accounting and disclosure practices and
                           principles.

                  8.       Review all analyses  prepared by  management  and the
                           independent   accountant  of  significant   financial
                           reporting  issues and  judgments  made in  connection
                           with  the  preparation  of  the  Company's  financial
                           statements,  including  any analysis of the effect of
                           alternative  generally accepted accounting  principle
                           ("GAAP")   methods   on   the   Company's   financial
                           statements and a description of any  transactions  as
                           to which  management  obtained  Statement on Auditing
                           Standards No. 50 letters.(1)

                  9.       Review with management and the independent accountant
                           the effect of regulatory and accounting  initiatives,
                           as  well  as  off-balance  sheet  structures,  on the
                           Company's financial statements.

         B.       REVIEW OF DOCUMENTS AND REPORTS

                  1.       Review   and   discuss   with   management   and  the
                           independent  accountant the Company's  annual audited
                           financial    statements   and   quarterly   financial
                           statements  (including  disclosures under the section
                           entitled  "Management's  Discussion  and  Analysis of
                           Financial  Condition and Results of  Operation")  and
                           any reports or other financial  information submitted
                           to any  governmental  body, or the public,  including
                           any certification, report, opinion or review rendered
                           by  the  independent  accountant,   considering,   as
                           appropriate,  whether the  information  contained  in
                           these  documents is consistent  with the  information
                           contained in the financial statements and whether the
                           independent   accountant   and  legal   counsel   are
                           satisfied  with the  disclosure  and  content of such
                           documents.    These    discussions    shall   include
                           consideration   of  the  quality  of  the   Company's
                           accounting  principles  as applied  in its  financial
                           reporting,  including  review  of  audit  adjustments
                           (whether or not recorded) and any such other inquires
                           as may be  appropriate.  Based  on  the  review,  the
                           Committee shall make its  recommendation to the Board
                           as  to  the  inclusion  of  the   Company's   audited
                           consolidated  financial  statements  in the Company's
                           annual report on Form 10-K.

                  2.       Review   and   discuss   with   management   and  the
                           independent  accountant  earnings press releases,  as
                           well as financial  information and earnings  guidance
                           provided  to  analysts  and  rating   agencies.   The
                           Committee  need not discuss in advance each  earnings
                           release  but should  generally  discuss  the types of
                           information   to  be   disclosed   and  the  type  of
                           presentation  to be made in any  earnings  release or
                           guidance.

                  3.       Review  the  regular  internal  reports  prepared  by
                           management.

- --------
1 SAS No. 50 provides  performance  and reporting  standards for written reports
from accountants with respect to the application of accounting principles to new
transactions and financial products or regarding  specific  financial  reporting
issues.



                                       18





                  4.       Review reports from  management  and the  independent
                           accountant   on  the   Company's   subsidiaries   and
                           affiliates,  compliance with the Company's code(s) of
                           conduct, applicable law and insider and related party
                           transactions.

                  5.       Review with management and the independent accountant
                           any  correspondence  with  regulators  or  government
                           agencies  and any  employee  complaints  or published
                           reports  that raise  material  issues  regarding  the
                           Company's   financial    statements   or   accounting
                           policies.

                  6.       Prepare the report of the audit committee required by
                           the rules of the SEC to be included in the  Company's
                           annual proxy statement.

                  7.       Submit the minutes of all  meetings of the  Committee
                           to,  or  discuss  the  matters   discussed   at  each
                           Committee meeting with, the Board.

                  8.       Review any restatements of financial  statements that
                           have  occurred  or  were   recommended.   Review  the
                           restatements made by other clients of the independent
                           accountant.

         C.       INDEPENDENT ACCOUNTANT MATTERS

                  1.       The  Committee  shall  be  directly  responsible  for
                           interviewing and retaining the Company's  independent
                           accountant,   considering   the   accounting   firm's
                           independence  and  effectiveness  and  approving  the
                           engagement fees and other  compensation to be paid to
                           the independent accountant.

                  2.       On an annual basis,  the Committee shall evaluate the
                           independent accountant's qualifications,  performance
                           and independence.  To assist in this undertaking, the
                           Committee shall require the independent accountant to
                           submit a report  (which  report  shall be reviewed by
                           the  Committee)   describing   (a)  the   independent
                           accountant's internal quality-control procedures, (b)
                           any  material   issues  raised  by  the  most  recent
                           internal  quality-control  review, or peer review, of
                           the   accounting   firm   or  by   any   inquiry   or
                           investigations   by   governmental   or  professional
                           authorities   (within  the   preceding   five  years)
                           respecting one or more independent audits carried out
                           by the independent accountant, and any steps taken to
                           deal with any such  issues and (c) all  relationships
                           the  independent  accountant has with the Company and
                           relevant  third parties to determine the  independent
                           accountant's    independence.     In    making    its
                           determination,  the Committee shall consider not only
                           auditing and other traditional  accounting  functions
                           performed  by the  independent  accountant,  but also
                           consulting,  legal,  information  technology services
                           and  other  professional  services  rendered  by  the
                           independent   accountant  and  its  affiliates.   The
                           Committee  shall also consider  whether the provision
                           of any of these non-audit services is compatible with
                           the  independence  standards  under the guidelines of
                           the SEC and of the Independence Standards Board.

                  3.       Approve  in  advance  any  non-audit  services  to be
                           provided  by the  independent  accountant  and  adopt
                           policies and procedures for engaging the  independent
                           accountant to perform non-audit services.

                  4.       Review  on  an  annual  basis  the   experience   and
                           qualifications  of the  senior  members  of the audit
                           team.  Discuss the  knowledge  and  experience of the
                           independent  accountant and the senior members of the
                           audit team with  respect to the  Company's  industry.
                           The  Committee  shall ensure the regular  rotation of
                           the lead audit  partner and audit  review  partner as
                           required by law and consider  whether there should be
                           a  periodic  rotation  of the  Company's  independent
                           accountant.

                  5.       Review the performance of the independent  accountant
                           and  terminate  the   independent   accountant   when
                           circumstances warrant.


                                       19





                  6.       Establish and periodically review hiring policies for
                           employees  or  former  employees  of the  independent
                           accountant.

                  7.       Review with the  independent  accountant any problems
                           or difficulties  the auditor may have encountered and
                           any   "management"   or  "internal   control"  letter
                           provided  by  the  independent   accountant  and  the
                           Company's response to that letter. Such review should
                           include:

                           (a)      any  difficulties  encountered in the course
                           of the audit work,  including any restrictions on the
                           scope of activities or access to required information
                           and any disagreements with management;

                           (b)      any   accounting   adjustments   that   were
                           proposed by the independent  accountant that were not
                           agreed to by the Company; and

                           (c)      communications   between   the   independent
                           accountant  and its  national  office  regarding  any
                           issues on which it was  consulted  by the audit  team
                           and matters of audit quality and consistency.

                  8.       Communicate with the independent accountant regarding
                           (a) critical  accounting policies and practices to be
                           used in preparing the audit report,  (b)  alternative
                           treatments  of  financial   information   within  the
                           parameters   of  GAAP   that  were   discussed   with
                           management, including the ramifications of the use of
                           such  alternative  treatments and disclosures and the
                           treatment  preferred by the  independent  accountant,
                           (c) other material written communications between the
                           independent accountant and management of the Company,
                           and (d) such other  matters as the SEC and Nasdaq may
                           direct by rule or regulation.

                  9.       Periodically consult with the independent  accountant
                           out of the  presence  of  management  about  internal
                           controls   and  the  fullness  and  accuracy  of  the
                           organization's financial statements.

                  10.      Oversee the  independent  accountant  relationship by
                           discussing with the independent accountant the nature
                           and  rigor  of  the  audit  process,   receiving  and
                           reviewing   audit   reports  and  ensuring  that  the
                           independent   accountant   has  full  access  to  the
                           Committee  (and the  Board)  to report on any and all
                           appropriate matters.

                  11.      Discuss with the independent  accountant prior to the
                           audit the general planning and staffing of the audit.

                  12.      Obtain  a   representation   from   the   independent
                           accountant   that  Section  10A  of  the   Securities
                           Exchange Act of 1934 has been followed.

         D.       INTERNAL/DISCLOSURE CONTROL MATTERS

                  1.       Discuss with management policies with respect to risk
                           assessment  and  risk  management.   Although  it  is
                           management's  duty to assess and manage the Company's
                           exposure  to  risk,  the  Committee   should  discuss
                           guidelines  and  policies  to govern  the  process by
                           which risk  assessment  and management is handled and
                           review the steps  management has taken to monitor and
                           control the Company's risk exposure.

                  2.       Establish  regular and separate  systems of reporting
                           to the  Committee  by  each  of  management  and  the
                           independent   accountant  regarding  any  significant
                           judgments  made in  management's  preparation  of the
                           financial  statements  and  the  view  of  each as to
                           appropriateness of such judgments.

                  3.       Following  completion  of the  annual  audit,  review
                           separately   with   each   of   management   and  the
                           independent  accountant any significant  difficulties
                           encountered during the course of the audit, including
                           any  restrictions  on the  scope of work or access to
                           required information.


                                       20





                  4.       Review with the independent accountant and management
                           the  extent  to  which  changes  or  improvements  in
                           financial   or   accounting   practices   have   been
                           implemented.  This review  should be  conducted at an
                           appropriate  time  subsequent  to  implementation  of
                           changes or improvements, as decided by the Committee.

                  5.       Advise the Board  about the  Company's  policies  and
                           procedures for compliance  with  applicable  laws and
                           regulations and the Company's code(s) of conduct.

                  6.       Establish  procedures  for  receipt,   retention  and
                           treatment  of  complaints   and  concerns   regarding
                           accounting,  internal accounting controls or auditing
                           matters,   including   procedures  for  confidential,
                           anonymous   submissions   from  employees   regarding
                           questionable accounting or auditing matters.

                  7.       Periodically discuss with the chief executive officer
                           and   chief   financial   officer   (a)   significant
                           deficiencies  in  the  design  or  operation  of  the
                           internal  controls  that could  adversely  affect the
                           Company's ability to record,  process,  summarize and
                           report financial data and (b) any fraud that involves
                           management or other  employees who have a significant
                           role in the Company's internal controls.

                  8.       Ensure that no officer, director or any person acting
                           under  their   direction   fraudulently   influences,
                           coerces,  manipulates  or  misleads  the  independent
                           accountant  for purposes of rendering  the  Company's
                           financial statements materially misleading.

         While the  Committee has the  responsibilities  and powers set forth in
this Charter,  it is not the duty of the Committee to plan or conduct  audits or
to determine that the Company's  financial  statements are complete and accurate
and are in accordance with generally accepted accounting principles. This is the
responsibility of management and the independent accountant.

V.       ANNUAL EVALUATION PROCEDURES

         The Committee  shall annually assess its performance to confirm that it
is  meeting  its  responsibilities  under  this  Charter.  In this  review,  the
Committee shall consider,  among other things,  (a) the  appropriateness  of the
scope and content of this Charter,  (b) the appropriateness of matters presented
for information and approval,  (c) the sufficiency of time for  consideration of
agenda  items,  (d)  frequency  and length of  meetings  and (e) the  quality of
written  materials and  presentations.  The Committee may recommend to the Board
such changes to this Charter as the Committee deems appropriate.

VI.      INVESTIGATIONS AND STUDIES

         The Committee shall have the authority and sufficient funding to retain
special legal,  accounting or other consultants (without seeking Board approval)
to advise the Committee.  The Committee may conduct or authorize  investigations
into or studies of matters within the Committee's scope of  responsibilities  as
described  herein,  and may retain,  at the expense of the Company,  independent
counsel  or other  consultants  necessary  to assist the  Committee  in any such
investigations or studies.  The Committee shall have sole authority to negotiate
and approve the fees and retention  terms of such  independent  counsel or other
consultants.

VII.     MISCELLANEOUS

         Nothing  contained  in this  Charter is intended  to expand  applicable
standards  of  liability  under  statutory or  regulatory  requirements  for the
directors  of  the  Company  or  members  of the  Committee.  The  purposes  and
responsibilities  outlined  in this  Charter  are  meant to serve as  guidelines
rather than as  inflexible  rules and the  Committee is encouraged to adopt such
additional  procedures and standards as it deems  necessary from time to time to
fulfill its responsibilities. This Charter, and any amendments thereto, shall be
displayed  on the  Company's  web site and a printed  copy of such shall be made
available to any shareholder of the Company who requests it.

Adopted by the Audit Committee and approved
by the Board of Directors on April 22, 2003


                                       21





                          BIOSOURCE INTERNATIONAL, INC.

                    PROXY FOR ANNUAL MEETING OF STOCKHOLDERS


         The  undersigned,  a Stockholder  of BIOSOURCE  INTERNATIONAL,  INC., a
Delaware corporation (the "Company"), hereby nominates, constitutes and appoints
JEAN-PIERRE L. CONTE,  LEONARD M. HENDRICKSON and CHARLES C. BEST, or any one of
them,  as proxy of the  undersigned,  each with full power of  substitution,  to
attend,  vote and act for the  undersigned at the Annual Meeting of Stockholders
of the  Company,  to be  held  on  July  18,  2003,  and  any  postponements  or
adjournments thereof, and in connection therewith,  to vote and represent all of
the shares of the Company  which the  undersigned  would be entitled to vote, as
follows:

A VOTE FOR ALL PROPOSALS IS RECOMMENDED BY THE BOARD OF DIRECTORS:

Proposal 1.       To elect the Board of Directors' six nominees as directors.

     Jean-Pierre L. Conte     Leonard M. Hendrickson     David J. Moffa, Ph.D.
     John R. Overturf, Jr.      Robert J. Weltman       John L. Zabriskie, Ph.D.

                  [_]      FOR ALL NOMINEES  LISTED  ABOVE  (except as marked to
                           the contrary below)

                  [_]      WITHHELD

         (INSTRUCTION: To withhold authority to vote for any individual nominee,
         write that nominee's name in the space below:)

         -----------------------------------------------------------------------

         The  undersigned  hereby  confer(s)  upon the  proxies and each of them
         discretionary  authority  with  respect to the election of directors in
         the event  that any of the above  nominees  is unable or  unwilling  to
         serve.

Proposal 2.       To  ratify  the  appointment  of KPMG  LLP   as the  Company's
independent public accountants for the year ending December 31, 2003.

                 [_]  FOR       [_]  AGAINST       [_]  ABSTAIN


         The  undersigned  hereby  revokes any other proxy to vote at the Annual
Meeting,  and hereby  ratifies and confirms all that said attorneys and proxies,
and each of them, may lawfully do by virtue hereof.  With respect to matters not
known at the time of the  solicitation  hereof,  said proxies are  authorized to
vote in accordance with their best judgment.

         THIS PROXY WILL BE VOTED IN ACCORDANCE WITH THE  INSTRUCTIONS SET FORTH
ABOVE OR, TO THE EXTENT NO CONTRARY DIRECTION IS INDICATED, WILL BE TREATED AS A
GRANT OF AUTHORITY TO VOTE FOR ALL PROPOSALS. IF ANY OTHER BUSINESS IS PRESENTED
AT THE ANNUAL  MEETING,  THIS PROXY  CONFERS  AUTHORITY TO AND SHALL BE VOTED IN
ACCORDANCE WITH THE RECOMMENDATIONS OF THE PROXIES.





         The undersigned  acknowledges receipt of a copy of the Notice of Annual
Meeting and  accompanying  Proxy Statement  dated May 21, 2003,  relating to the
Annual Meeting.

                                         Dated:___________________________, 2003

                                         Signature:_____________________________

                                         Signature:_____________________________
                                         Signature(s) of Stockholder(s)
                                         (See Instructions Below)

                                         The    Signature(s)    hereon    should
                                         correspond  exactly with the name(s) of
                                         the  Stockholder(s)  appearing  on  the
                                         Share Certificate. If stock is jointly,
                                         all  joint  owners  should  sign.  When
                                         signing    as    attorney,    executor,
                                         administrator,   trustee  or  guardian,
                                         please  give  full  title as  such.  If
                                         signer is a  corporation,  please  sign
                                         the  full  corporation  name,  and give
                                         title of signing officer.

 [_] Please indicate by checking this box if you anticipate attending the Annual
     Meeting.

 THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS
        OF BIOSOURCE INTERNATIONAL, INC.