EXHIBIT 32.2


           CERTIFICATE PURSUANT TO 18 U.S.C. SECTION 1350, AS ENACTED
                BY SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002



         I, Brian J. Hayden, the Vice President-Finance and Chief Financial
Officer of Bone Care International, Inc. (the "Company"), certify, pursuant to
18 U.S.C. Section 1350, that (i) the Quarterly Report on Form 10-Q of the
Company for the quarter ended December 31, 2003 (the "Form 10-Q") fully complies
with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act
of 1934 and (ii) the information contained in the Form 10-Q fairly presents, in
all material respects, the financial condition and results of operations of the
Company.


                                      /S/  BRIAN J. HAYDEN
                                      ---------------------------------------
                                      Brian J. Hayden
                                      Vice President -- Finance and Chief
                                      Financial Officer
February 10, 2004