Is Clenbuterol legal in the United Kingdom?

The first proper human study, in 2025, found two weeks of clenbuterol added 0.91 kg of lean mass, did nothing to fat, and cut fitness (the most oxygen the body can use) by 7 percent. It is not approved for people in the United States. It has poisoned people in outbreaks, from tainted meat and from heroin cut with it.

Clenbuterol is a long-acting drug that opens the airways by switching on beta-2 receptors. A few countries license it for people with breathing problems.

How it works: It switches on beta-2 receptors. In muscle, that sets off a chain of signals inside the cell.

Approval history: Not approved for human use in the United States, at any dose or for any use. Its only US approval is for animals, as a drug that opens the airways in horses. Some other countries license it for people, to open the airways. WADA, the world anti-doping agency, bans it in sport as a muscle-building drug.

Licenses medicines for sale in the UK. A compound without a licence to be sold (a marketing authorisation) is an unlicensed medicine. The law only lets it reach people through a prescriber, under the specials scheme (unlicensed medicines made for one patient's needs). It cannot be sold as a research product.

The legal category above is how The Longevity Archive reads Medicines and Healthcare products Regulatory Agency listings for Clenbuterol on the reviewed date. It is not a legal opinion. Rules change. Bringing a compound into the country, prescribing it and owning it can each be treated differently. Check with the agency before you act on anything here.

Check MHRA directly

Whether Clenbuterol is banned in sport is set by the World Anti-Doping Code and by military rules, not by its legal status in the United Kingdom. Before you compete or get tested, look up Clenbuterol by name on the Prohibited List, or look up a named product in Global DRO. Under the World Anti-Doping Code, category S0 bans, at all times, any drug-like substance that meets two tests. No other section of the List covers it. And no government health regulator anywhere has a current approval for it as a treatment in people. Many substances that are approved somewhere are banned by name in another section. So approval does not mean a substance is allowed in sport.

• WADA Prohibited List
• Global DRO (check a named product)
• USADA (US athletes)
• Operation Supplement Safety (US service members)

The rules you compete or serve under decide this, not this page.