The U.S. Drug Enforcement Agency reports that 99% of illegal steroids are made from drugs originating in China:
Federal authorities said yesterday that they had exposed a sprawling underground distribution network for steroids, human growth hormone and other illicit bodybuilding drugs supplied by 37 companies in China.
The operation revealed a much wider, more diffuse commerce in performance-enhancing drugs than previously known, with a latticework of bathroom and basement manufacturers and distributors. That contrasted with the more centralized drug network from past years that tapped into established pharmaceutical pipelines. [Full text]