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5-androstenedione is a prohormone of testosterone. In the United States, the Controlled Substance Act is inclusive to anabolic steroids and their precursors. Thus 5-androstenedione is a controlled substance. The World Anti-Doping Agency also prohibits use of 5-androstenedione in athletes.
5-androstenedione is structurally similar to 4-androstenedione, with the exception of the positioning of a carbon-carbon double bond. 4-Androstenedione is a prohormone which is naturally produced in the body by the adrenal glands and gonads, and acts as precursor to testosterone, as well as estrone and estradiol. [Wikipedia]
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