Ostarine (MK-2866): Patient Information & Safety Notes
Also known as MK-2866, GTx-024
Other names: mk-2866, enobosarm, gtx-024, -ostarine-mk2866
Ostarine (enobosarm) is an investigational SARM that binds androgen receptors selectively in muscle and bone tissue. It has been in clinical trials for muscle wasting (cancer cachexia) but has NOT received FDA approval. SARMs as a class are not FDA-approved as drugs and are not legal dietary supplements.
In plain language
What Ostarine is used for
- Investigated in clinical trials for cancer cachexia and muscle wasting (no approved use)
Taking this medicine
How it is administered
- Oral capsule
Read before you decide
Risks and precautions
Risks and warnings
- Fatigue, depression
- Headache, nausea
- Suppression of natural testosterone
- Potential hepatotoxicity (liver injury)
- Cardiovascular risk (lipid changes)
Who should not take it
- Pregnancy or breastfeeding
- Liver disease
Common questions
Patient questions
Are SARMs like ostarine legal?
SARMs including ostarine are not FDA-approved and cannot legally be sold as dietary supplements. The FDA has issued multiple warnings about SARM products. Using them without medical supervision and a legitimate investigational protocol carries significant legal and health risks.
Related medications
Explore treatment hubs
This information is educational — not medical advice.
This page is provided for general educational purposes and summarizes publicly available data from sources such as the U.S. Food & Drug Administration. It is not a substitute for the judgment of a licensed clinician and should not be used to start, stop, or change any medication. It may be incomplete or out of date, and individual circumstances vary. Always talk with your prescriber or pharmacist about your specific medications and health conditions. If you think you may have a medical emergency, call 911.
Sources & References
Learn more about where our data comes from and how we write and review medical content.