Is MK-677 Legal? Ibutamoren Laws in the US, UK, Australia and Germany

Is MK-677 legal? MK-677 (ibutamoren) is not an approved medicine anywhere we could find, so in most countries it can’t legally be sold as a medicine or supplement for people. It is not a controlled drug under US federal law, but the FDA treats products sold as MK-677 as unapproved new drugs. In Australia it is prescription-only and possessing it without a prescription is illegal. Germany’s anti-doping law names it, and WADA bans it in sport at all times.

Below is the status in the countries people search for most, what “research use only” labels mean legally, and why MK-677 isn’t approved. We checked every source on 30 October 2026. Laws change, and this is general information, not legal advice. For the compound itself, see our MK-677 (ibutamoren) review.

MK-677 legal status by country

Is MK-677 legal in the US?

It sits in a gray zone that is narrower than many sellers suggest:

• Not a controlled substance. Ibutamoren does not appear on the DEA’s alphabetical list of controlled substances (version dated 21 October 2026) (DEA). So it is not in the same legal category as anabolic steroids, which are Schedule III on the same list.
• Not an approved drug. No FDA-approved drug contains ibutamoren (FDA 2024).
• Sold as an unapproved drug. In a December 2025 warning letter to an online seller, the FDA said products including “MK-677 Ibutamoren” were “unapproved new drugs under section 505(a)” of the Food, Drug, and Cosmetic Act, and that selling them across state lines violates the Act (FDA 2025).
• Not for pharmacy compounding. Since 29 December 2022 (outsourcing facilities) and 29 September 2023 (compounding pharmacies), ibutamoren mesylate has been in Category 2, “due to the potential for congestive heart failure in certain patients” (FDA Category 2).

In short: the FDA’s warning letters have targeted sellers, and federal law doesn’t list MK-677 as a controlled drug. State laws can differ.

Is MK-677 legal in the UK?

We found no UK law that names ibutamoren. A full-text search of legislation.gov.uk returns only EU customs tariff regulations that list it as a product code (legislation.gov.uk). That means it is not named in the Misuse of Drugs Act or any other UK statute on the site. It is also not an approved medicine anywhere we could find, and it is banned in sport under the WADA list (WADA 2026). We found no UK guidance on MK-677 specifically; for a definite answer about selling, importing or using it, ask the MHRA or a lawyer.

Is MK-677 legal in Australia?

No, not without a prescription. The Poisons Standard (June 2026) lists ibutamoren in Schedule 4 (prescription-only medicines) and in Appendix D, clause 5, which covers “poisons for which possession without authority is illegal” (Poisons Standard).

Is MK-677 legal in Germany? (Ist Ibutamoren in Deutschland legal?)

Germany’s Anti-Doping Act (AntiDopG) lists “Ibutamoren, synonym MK-677, Nutrabol” in its annex among growth hormone secretagogues (AntiDopG Anlage). Section 2 prohibits manufacturing, trading, selling or prescribing it for doping in sport, and prohibits acquiring, possessing or bringing into Germany a “nicht geringe Menge” (more than a small amount) for doping in sport (§ 2 AntiDopG). The law is framed around use in sport.

Other countries

For Ireland, see are SARMs legal in Ireland; for an overview of SARMs laws worldwide, see are SARMs legal. Remember that MK-677 is not a SARM, so laws that name SARMs as a class may not cover it, and laws that cover growth hormone secretagogues may.

Is MK-677 banned in sport?

Yes. WADA’s Prohibited List bans “growth hormone secretagogues (GHS) and their mimetics”, naming ibutamoren (MK-677), at all times, in and out of competition (WADA 2026). Anti-doping labs can detect it in blood at sub-nanogram levels (Mazzarino 2026), and a single 10 mg dose was found in hair four weeks later (Kintz 2026). See WADA and testing.

What “research use only” labels mean

Many sellers label MK-677 “for research use only” or “not for human consumption”. In its December 2025 warning letter, the FDA said that despite such statements, evidence from the product labeling and website “establishes that your products are intended to be drugs for human use” (FDA 2025). The FDA’s adverse event files also include a man who only noticed the “Not for Human Consumption, For Laboratory Use Only” line after taking a product for several weeks (FDA 2024). The label does not make a product legal or safe for people.

Why isn’t MK-677 approved?

Merck developed it in the 1990s and stopped development; it was never approved (FDA 2024). In 2024 the FDA concluded there was insufficient information to support its effectiveness for growth hormone deficiency, osteoporosis, hip fracture, sarcopenia, obesity or Alzheimer’s disease, and it listed serious safety concerns including high blood sugar, liver enzyme rises, fluid overload and heart failure in frail older adults (FDA 2024). As LUM-201, it is now in a Phase 3 trial for children with GH deficiency (NCT06948214). Its side effects are covered in MK-677 side effects.

Conclusion

MK-677 is not a controlled drug under US federal law, but it is not approved anywhere we could find, the FDA treats products sold as MK-677 as unapproved drugs, and “research use only” labels don’t change that. In Australia, possessing it without a prescription is illegal; in Germany, it is covered by the anti-doping law; and in sport it is banned outright. Check your own country’s current rules before relying on any of this.