Is Thymosin alpha-1 with KPV and LL-37 legal in the United States?

A three-peptide immune blend from the clinic end of the market. The ingredient with the biggest study, thymosin alpha-1, was tested in 1,106 adults with sepsis, a life-threatening blood infection. It did not lower deaths at 28 days: people on the dummy shot did just as well. LL-37 has two small studies as a wound cream, both with good results. KPV has no data in people. Nobody has tested the mix, and no vial size is standard.

The pitch is that one peptide organises the immune system, one calms swelling, and one kills germs while helping tissue heal. Each third has its own evidence.

How it works: Thymosin alpha-1 tunes the immune system's T cells and the signals they use, such as interleukin-2 and interferon gamma. LL-37 is a germ-killing peptide.

Approval history: Thymosin alpha-1 is approved in several countries outside the United States, but not by the FDA. LL-37 and KPV are not approved anywhere. The combination has never been reviewed.

Approves prescription drugs, each for a named use. It also acts against unapproved products, including peptides sold online. Compounding pharmacies, which mix drugs to order, may make some compounds with a prescription. That only applies when the FDA puts the compound in a category of bulk ingredients it allows.

The legal category above is how The Longevity Archive reads U.S. Food and Drug Administration listings for Thymosin alpha-1 with KPV and LL-37 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 FDA directly

Whether Thymosin alpha-1 with KPV and LL-37 is banned in sport is set by the World Anti-Doping Code and by military rules, not by its legal status in the United States. Before you compete or get tested, look up Thymosin alpha-1 with KPV and LL-37 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.