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are currently being sold legally and marketed by brands such as "Advanced Muscle Science" as 1-androsterone, and are labeled to contain 1-androstenedione-3b-ol,17-one. Only through a recent clinical study has it been shown that the 1-androsterone in the capsules being sold was identified using semi-quantitation and confirmed to be 1-testosterone.

Research surrounding other prohormones and prohormone supplements is limited, so many side effects are unknown regarding both legal and illegal prohormone supplements.