SARMs: The Illegal Supplements in Your Gym

Selective androgen receptor modulators (SARMs) are drug compounds first developed to treat muscle loss and bone disease. The plan was to get the muscle-building effects of steroids with fewer side effects. None of them are FDA-approved for any human medical use. Yet they are sold openly online and in gyms, often labeled as "research chemicals" or "not for human consumption" to dodge drug law. Buyers are taking unapproved drugs with documented risks of liver failure, heart attack, and stroke.

The Appeal and the Reality

SARMs were designed to switch on androgen receptors in muscle and bone while leaving the prostate and liver mostly alone. In theory, that means anabolic benefits without the worst side effects of testosterone and other synthetic androgens. In practice, the selectivity is incomplete. Recreational doses are far higher than what trials studied. Products are not pharmaceutical grade. And long-term safety data in healthy people barely exists, because no SARM ever completed FDA approval. The trials needed to prove safety were never done.

Documented Adverse Effects

Published case reports and case series describe SARM-related drug-induced liver injury (DILI), severe hypogonadism with testosterone suppression that sometimes requires medical treatment, ischemic stroke in young athletes, and cardiac events including myocarditis (Flores 2020 PMID 33134761; Barbara 2020 PMID 32754621; Bedi 2021 PMID 34239744). A 2023 review in Therapeutic Advances in Drug Safety summarized the published literature and found cholestatic liver injury was the single most common pattern reported (Hilkens 2023 PMID 38028932). The FDA issued consumer warnings against SARMs in body-building products in October 2017 and again in 2021, citing risks of liver toxicity, heart attack, and stroke (FDA 2017; FDA 2021). FDA enforcement actions and product testing have repeatedly found SARMs in products labeled only as “workout” or “testosterone support,” sometimes at concentrations far above any studied dose, and sometimes containing SARMs not listed on the label at all (Van Wagoner 2017 PMID 28114673). Selling SARMs in human dietary supplements is illegal under the Dietary Supplement Health and Education Act (DSHEA), because SARMs are unapproved drugs, not dietary ingredients. The federal SARMs Control Act — reintroduced most recently in 2024 — would explicitly schedule SARMs as controlled substances if enacted.

If You Have Used SARMs

If you develop yellowing of the eyes or skin (jaundice), dark urine, severe fatigue, racing heart, testicular shrinkage, or major mood changes, see a doctor right away. Tell them you used a SARM — many clinicians have not seen these cases and will not ask. A reasonable first work-up is liver enzymes (AST, ALT, alkaline phosphatase, bilirubin), a lipid panel, and a full hormone panel (testosterone, LH, FSH, estradiol). Recovery of the hypothalamic-pituitary-gonadal axis after SARM use can take months and sometimes does not fully return to baseline.