Legal status · United Kingdom
Is LL-37 legal in the United Kingdom?
No. LL-37 is not an approved medicine in the United Kingdom; its classification is "Not licensed". Nothing containing it is authorized for any use in people. Vials labeled "for research use only" are not exempt: that label does not make human use lawful. Human evidence: Preliminary.
LL-37 in the United Kingdom at a glance
| Classification | Not licensed |
|---|---|
| MHRA approval status | Not approved by MHRA |
| Evidence level | Preliminary (research strength: Preliminary) |
| Reviewed | Sep 2026 |
Classification and note come from the LL-37 profile, checked against Medicines and Healthcare products Regulatory Agency (MHRA) listings at the reviewed date.
What this means
- 01
No product containing LL-37 is approved by MHRA for any use in the United Kingdom, so nothing on the market is authorized for people.
- 02
"Research use only" is a vendor label, not a legal category that permits human use. It does not exempt a product from medicines law.
- 03
Importing, supplying or promoting it for human use can fall under medicines legislation in the United Kingdom. This page is general information, not legal advice.
What LL-37 is
The main human cathelicidin antimicrobial peptide, central to innate immunity and wound healing, with a complex double-edged role in disease.
LL-37 is the active form of the only human cathelicidin, a key part of innate immune defense. It kills microbes directly, supports wound healing, and shapes immune responses.
Mechanism: Disrupts microbial membranes and modulates immune cell activity, wound repair, and inflammation.
Regulatory history: Not FDA-approved; research peptide
How MHRA treats this kind of product
Licenses medicines for the UK market. A compound without a marketing authorisation is an unlicensed medicine, which can only lawfully be supplied for human use through a prescriber under the specials scheme, not sold as a research product.
The classification above is the The Longevity Archive reading of Medicines and Healthcare products Regulatory Agency listings for LL-37 at the reviewed date, not a legal opinion. Rules change, and importing, prescribing and possessing a compound can each be treated differently. Check the regulator directly before acting on anything here.
LL-37 in other countries
Frequently asked questions
Is LL-37 legal in the United Kingdom?
No. LL-37 is not an approved medicine in the United Kingdom; its classification is "Not licensed". Nothing containing it is authorized for any use in people. Vials labeled "for research use only" are not exempt: that label does not make human use lawful. Human evidence: Preliminary.
Can I buy LL-37 in the United Kingdom?
No approved product exists to buy. In the United Kingdom LL-37 is classified as "Not licensed", so there is no licensed pharmacy product. Vendors selling it "for research use only" are not selling it for human use, and that label does not change its legal status. This site does not list or recommend vendors.
Is LL-37 MHRA approved?
No. In the United Kingdom LL-37 is classified as "Not licensed", which is not a MHRA marketing approval. For comparison, the US FDA status is: Not FDA-approved; research peptide. Evidence level: Preliminary.
Related compounds in the United Kingdom
Full research profile
Mechanism, cited studies, FDA status and the full legal summary for LL-37 live on its compound profile.
LL-37 profileThis page is general information about the regulatory status of LL-37 in the United Kingdom, current as of Sep 2026. It is not legal advice, and classifications change; check Medicines and Healthcare products Regulatory Agency directly or consult a lawyer for a specific situation. Educational use only. This database summarizes published research. It is not medical advice and contains no dosing protocols or recommendations for personal use. The Longevity Archive has no vendor relationships and does not recommend where to buy anything.