EXHIBIT 32.1


               CERTIFICATE PURSUANT TO SECTION 1350 OF CHAPTER 63
                          OF TITLE 18 OF THE U.S. CODE


         I, Paul L. Berns, the President and Chief Executive Officer of Bone
Care International, Inc. (the "Company"), certify that (i) the Annual Report on
Form 10-K of the Company for the fiscal year ended June 30, 2003 (the "Form
10-K") 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-K fairly presents, in all material respects, the financial condition and
results of operations of the Company.


                                             /S/ PAUL L. BERNS
                                             ----------------------------------
                                             Paul L. Berns
                                             September 26, 2003



















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