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S-23, which also goes by the name Unii-xdk89456WM, was developed by GTX, Inc. to be a male hormonal contraceptive. It works as an androgen receptor agonist, which means it binds to the receptors of androgenic hormones like testosterone. Because it’s a selective androgen receptor modulator (SARM), S-23 is used in the fitness community for its ability to increase muscle growth from resistance training . Unlike testosterone boosters, SARMs such as S-23 don’t act on muscle tissue directly. Instead, they work by improving workout performance so that more muscle can be gained from each training session.
Because of its ability to enhance your performance, however, S-23 is banned by the World Anti-Doping Agency (WADA). Toxicologists have studied the metabolites of SARMs, including S-23, so that they can identify them as signs of doping in urine samples .
According to a study published in Endocrinology, S-23 produces both anabolic and androgenic effects. In a dose-dependent manner, it also suppresses the production of sperm .