Exhibit 99.1

                                                               Investor Contact:
                                                    The Investor Relations Group
                                               Lisa Lindberg/Dian Griesel, Ph.D.
                                                             Phone: 212-825-3210
                                                      Email: TheProTeam@aol.com
                                                             -------------------

                     UNIGENE RELEASES LETTER TO SHAREHOLDERS

Fairfield,  NJ--September 5, 2002 - Unigene Laboratories,  Inc. (OTCBB: UGNE) is
publishing the following letter to its shareholders:

Dear Fellow Shareholders,

This is a very  exciting time for Unigene.  We continue to make strong  progress
with our core  osteoporosis  programs as  evidenced  by our recent $150  million
licensing  agreement with  GlaxoSmithKline  and by the  advancement of our nasal
calcitonin program.

I wanted to update you on the  progress we have made to date and  highlight  our
initiatives and operational focus over the coming months:

     o    Oral PTH Program. As announced in April of this year, our $150 million
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          licensing  agreement  with  GlaxoSmithKline  for our oral  parathyroid
          hormone (PTH) product represents a significant  milestone for Unigene.
          The fact  that one of the  world's  leading  pharmaceutical  companies
          chose to work with Unigene, after a thorough evaluation of alternative
          opportunities,  is a tribute to the quality and potential of Unigene's
          patented  technologies.  The most exciting aspect of PTH is its unique
          ability to grow  significant  amounts  of new bone,  unlike all of the
          current  therapies  which  principally  act to reduce the rate of bone
          loss.  Published reports estimate that formulations of PTH requiring a
          daily  injection could generate annual sales in excess of $500 million
          by 2005.  We believe that an oral  formulation  is more  desirable and
          could be  expected  to exceed  those  levels.  During the  development
          program,  Unigene will receive significant milestone payments from GSK
          and GSK  will  fund  its  development  activities  and  will  purchase
          Unigene's bulk PTH.

     o    Nasal  Calcitonin   Program.  We  believe  that  sales  of  our  nasal
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          calcitonin product may commence as soon as 2003. Last year, U.S. sales
          of the currently  marketed nasal calcitonin product were approximately
          $300 million.  Recent concerns over hormone replacement therapies have
          led  many   patients  and   practitioners   to  consider   alternative
          osteoporosis  therapies.  This could mean that sales of calcitonin,  a
          product with an excellent  safety profile,  may increase in the coming
          years. This has also increased  interest from potential  marketing and
          distribution  partners and should  allow us to select a partner  whose
          marketing  capabilities  and strategy seem best suited to maximize the
          return on this  opportunity.  We are  currently in  negotiations  with
          several  potential  distribution  partners  and  expect to  finalize a
          licensing  agreement in 2002. We expect that the  licensing  agreement
          would  involve  upfront,  milestone and royalty  payments.  Because we
          anticipate  that our  potential  partner may take the  opportunity  to
          review  the  New  Drug  Application  (NDA)  for our  nasal  calcitonin
          product,  we expect  that the NDA will not be filed  until the  fourth
          quarter of 2002.





     o    Chinese Calcitonin  Programs.  Our joint venture with the Shijiazhuang
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          Pharmaceutical  Group intends to file a Chinese NDA for injectable and
          nasal calcitonin  products by year end. There are more than 90 million
          osteoporosis  sufferers  in  China  and  the  Chinese  government  has
          identified  osteoporosis  as one of the  country's  top  three  health
          priorities.   An  approved   Chinese  NDA  will  give  us  significant
          advantages in the market and our  partnership  with one of the largest
          pharmaceutical companies in China should provide us with the resources
          to maximize this opportunity.

     o    Oral Calcitonin  Program. The recent  negative news regarding  hormone
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          replacement  therapy has heightened  interest in this product. We have
          now received the data generated from our prior  collaboration  and are
          in discussion  with  pharmaceutical  companies  who are  interested in
          completing  the  development  of and assuming  responsibility  for the
          manufacturing of the product.

     o    Manufacturing Capabilities.  We expect that the manufacturing capacity
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          for PTH  and  calcitonin  in our  state  of the art GMP  manufacturing
          facility will be  sufficient to meet the expected  demand for clinical
          trials and where appropriate, for commercialization of these products.
          This factory may also be used for  production of other peptides in the
          future.

     o    Other Oral  Peptides.  In  preclinical  studies  we have  successfully
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          delivered  insulin and other glucose  regulating  peptides,  DDAVP and
          leuprolide  which have potential  applications  in treating  diabetes,
          incontinence,  and endometriosis and prostate cancer, respectively. We
          believe that there will be  significant  licensing  opportunities  for
          these and other peptide products.

We  believe  that our focus on  therapies  to treat  osteoporosis  will  deliver
significant value to our shareholders  both in the near term and long-term.  The
market  opportunity for  osteoporosis  therapies is vast with  approximately  44
million people in the U.S.  afflicted with either  osteoporosis or low bone mass
and over 200 million  sufferers  worldwide.  More than 800,000 new prescriptions
were written for osteoporosis in the first month of this year alone.

The value of our technologies is not limited solely to osteoporosis.  We believe
that our  platform  oral  delivery  and  manufacturing  technologies  and patent
positions  are strong  with  potential  applications  in the  treatment  of many
diseases  including  diabetes  and  cancer.  While these  programs  are still in
pre-clinical  stages, we believe that the long-term value to our shareholders is
significant and we expect to continue to develop these programs.

We are excited by recent developments at Unigene over the past months and we are
even more excited by what we expect to achieve in 2002 and in 2003. We will work
to continue to keep our  shareholders  updated on the progress of our  licensing
activities  and our nasal  calcitonin  NDA by hosting  conference  calls  and/or
through additional shareholder letters.

Thank you for your continued support.

Sincerely,


Warren P. Levy, Ph.D.
President & CEO

     Safe Harbor statements under the Private Securities Litigation Reform Act
of 1995: This press release contains forward-looking statements as defined in
Section 27A of the Securities Act of 1933, as amended, and Section 21E of the
Securities Exchange Act of 1934, as amended. Such forward-looking statements are
based upon Unigene Laboratories, Inc.'s management's current expectations,
estimates, beliefs, assumptions, and projections about Unigene's business and
industry. Words such as "anticipates," "expects," "intends," "plans,"
"predicts," "believes," "seeks," "estimates," "may," "should," "would,"
"potential," "continue," and variations of these words (or negatives of these
words) or similar expressions, are intended to identify forward-looking
statements. In addition, any statements that refer to expectations, projections,
or other characterizations of future events or circumstances, including any
underlying assumptions, are forward-looking statements. These forward-looking
statements are not guarantees of future performance and are subject to certain
risks, uncertainties, and assumptions that are difficult to predict. Therefore,
our actual results could differ materially and adversely from those expressed in
any forward-looking statements as a result of various risk factors. These risks
and uncertainties include the risks associated with the effect of changing
economic conditions, trends in the products markets, variations in Unigene's
cash flow, market acceptance risks, technical development risks and other risk
factors detailed in Unigene's Securities and Exchange Commission filings.