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The active compound in M-13 is 13-ethyl-3-methoxy-gona-2,5(10)-diene-17-one. I find it unlikely that there are very many aware of this structure, but it is certainly worth discussing. It is legal because it is a progestin, and before anyone thinks "birth-control", remember that trenbolone, nandrolone, methyltrienolone and Methyl-Dien are all progestins. I doubt anyone will dispute the effects of these compounds upon favorable body composition.
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