The FDA thinks that the Heparin was deliberately contaminated See: http://news.bbc.co.uk/2/hi/asia-pacific/7375057.stm Or the China supplier used a cheaper alternative like Heparan Sulfate (a member of the glycosaminoglycan family ) or chondroitin sulfate of the same family? Since Heparin is also a a highly-sulfated glycosaminoglycan.