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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, and its use in athletes is prohibited by The World …
A delta-4 C19 steroid that is produced not only in the testis, but also in the ovary and the adrenal cortex. Depending on the tissue type, androstenedione can serve as a precursor to testosterone as well as estrone and estradiol.
Formestane was the first selective, type I, steroidal aromatase inhibitor used in the treatment of estrogen-receptor positive breast cancer in post-menopausal women. Formestane suppresses estrogen production from anabolic steroids or prohormones. Formestane i…