Is MK-677 legal?
Not as a drug. MK-677 has no FDA approval, so selling it for human use breaks federal drug law, and a 'research use only' label does not protect a seller whose site signals human use. It is not a controlled substance, and possessing it is not a federal crime. FDA lists it as a significant safety risk for compounding, so pharmacies cannot compound it.
DESCRIBES THE LAW · NOT LEGAL ADVICE · NO DOSING INFORMATION
Federal, compounding and sport status
CHECKED 12 OCT 2026Federal status
- Oct 29, 2024 · voted against · 13 no, 1 yes · SOURCE ↗
Sport-body status
What we couldn’t verify
State rules
NONE FOUNDWe found no state statute, board rule or enforcement action that names MK-677. The federal position above applies in all 50 states and DC.
What changed at the last check
1 CHANGES| Date | Field | Was | Now | Why |
|---|---|---|---|---|
| 12 Oct 2026 | WADA 2026 | prohibited (S2.2) | prohibited (S2.2.4) | Named under S2.2.4 as ibutamoren (MK-677). source ↗ |
Questions
3 ANSWERSIs MK-677 legal in the US?
Not as a drug. MK-677 has no FDA approval, so selling it for human use breaks federal drug law, and a 'research use only' label does not protect a seller whose site signals human use. It is not a controlled substance, and possessing it is not a federal crime. FDA lists it as a significant safety risk for compounding, so pharmacies cannot compound it.
Can a pharmacy compound MK-677?
503A and 503B Category 2 (significant safety risk: congestive heart failure signal in a hip-fracture trial). The PCAC voted against it 13-1 on 29 Oct 2024. Not eligible. Ibutamoren is a small molecule, not a peptide.
Is MK-677 banned in sport?
Yes. It is prohibited at all times under WADA 2026 class S2.2.4. Named under S2.2.4 as ibutamoren (MK-677).