Heading image that says 'Supplement Warning: Ostarine'


*Last updated 21 May 2021


Ostarine is a Selective Androgen Receptor Modulator (SARM) which is a drug designed to have similar effects to testosterone.

Alternative Names

  • Enobosarm

  • GTx-024

  • MK-2866

  • S-22

  • (2S)-3-(4-cyanophenoxy)-N-[4-cyano-3-(trifluoromethyl)phenyl]-2-hydroxy-2-methylpropanamide

Anti-Doping Status

Prohibited (S1. Anabolic Agents)

Legal Status

It is not approved for human consumption in the UK or anywhere else in the world.

Product Types

Ostarine is readily available online - it is commonly sold in pill form for oral consumption.

Product Claims

Dietary supplements containing Ostarine typically claim to promote muscle building.

Unscrupulous manufacturers may market such products as “legal steroids” or “steroid alternatives”.


There have been 178 adverse analytical findings (AAFs) reported globally between 2015 and 2019 (WADA Anti-Doping Testing Figures, 2015-19).