ACE-031 is a decoy receptor that binds factors like myostatin, but also other related factors that collectively aid in muscle growth. However, and I cannot stress this enough; I cannot possibly imagine how this biologic could be on the black market. It is made by only one company as a joint venture (Shire + Acceleron) and it would be essentially impossible to get, not to mention well over $100,000 for a course of treatment. But, do you think this has stopped peptide companies from trying to market something, of course not. This decoy receptor can only be generated in a properly formulated biologic system, like bacteria or yeast, or cultured mammalian cells with baculovirus technology. No way this could be on the black market at effective dosing, trust me.