Is Semax with selank and dihexa legal in the United Kingdom?

Three brain peptides sold as one focus stack. Two are approved medicines in Russia, with small studies done there. The third rests on a paper that was pulled by its journal in 2025, after a warning notice in 2021. Nobody has tested the mix, and no vial size is standard across sellers.

The pitch is one peptide to wake you up, one to calm you down, and one to grow new brain connections. That covers focus, anxiety and long-term learning.

How it works: In rats, semax seems to raise the brain growth protein BDNF and its receptor in the memory centre of the brain. Russian medical papers describe it as protecting nerve cells.

Approval history: None of the three is approved in the United States. Semax and selank are registered medicines in Russia. Dihexa has never been approved anywhere, and never finished human testing.

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 Semax with selank and dihexa 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 Semax with selank and dihexa 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 Semax with selank and dihexa 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.