Oxymesterone is a potent oral anabolic steroid derived from testosterone. In structure, it is most closely related to 4-hydroxytestosterone, differing only by the addition of a C-17 alpha methyl group, which makes oral dosing viable. Like its non-methylated analog, oxymesterone remains an effective lean-tissue-building steroid with only a minimal to moderate androgenic component. It has no known estrogenic or progestational activity, and no discernable ability to cause side effects related to female sex hormones. Oxymesterone is a “clean” drug among oral steroids: potent, non-aromatizable, and primarily anabolic in nature. According to the standard laboratory assays, oxymesterone is over three times more anabolic than methyltestosterone, with only half the androgenicity. Closer comparisons to methyltestosterone, which may seem structurally logical, do not hold up well in practice, given the sharp contrasts in relative effects between these drugs. The differences are as drastic as their applications, with methyltestosterone being used almost exclusively for bulking phases of training while oxymesterone would fit most comfortably with cutting cycles or competitive.