Is Ibutamoren (MK-677) legal?
Medically reviewed by Dr. Jonathan Snipes, MD
Reviewed for clinical accuracy · Last reviewed July 22, 2026 · Review policy
Quick answer
Ibutamoren (MK-677) is not FDA-approved and is prohibited in sport. It is sold as a research chemical, outside the regulated supply chain.
- FDA status
- Not FDA-approved; investigational compound
- Prohibited in sport (WADA)
- Yes
Ibutamoren is not an FDA-approved drug; it remained investigational and was never marketed. It is widely sold as a research chemical labeled 'not for human use,' outside the regulated supply chain. It is prohibited in sport under the WADA framework as a growth-hormone secretagogue.
Frequently asked questions
Is Ibutamoren (MK-677) legal in the US?+
Ibutamoren (MK-677) is not FDA-approved and is prohibited in sport. It is sold as a research chemical, outside the regulated supply chain.
Do you need a prescription for Ibutamoren (MK-677)?+
Ibutamoren (MK-677) is not FDA-approved. Where it is available through a compounding pharmacy it requires a prescription; research-chemical versions are sold outside the regulated, prescription-based system.