Is LL-37 legal?
Not as a drug. LL-37 has no FDA approval, so selling it for human use breaks federal drug law, and a 'research use only' label does not protect a seller whose site signals human use. It is not a controlled substance, and possessing it is not a federal crime. Pharmacies cannot compound it.
DESCRIBES THE LAW · NOT LEGAL ADVICE · NO DOSING INFORMATION
Federal, compounding and sport status
CHECKED 12 OCT 2026Federal status
Sport-body status
What we couldn’t verify
State rules
NONE FOUNDWe found no state statute, board rule or enforcement action that names LL-37. The federal position above applies in all 50 states and DC.
What changed at the last check
2 CHANGES| Date | Field | Was | Now | Why |
|---|---|---|---|---|
| 12 Oct 2026 | WADA 2027 | 2027 List not yet published | prohibited (S0), unchanged | WADA published the 2027 List on 21 Sep 2026. It adds 'peptides' to the S0 examples of substances with no approval for human therapeutic use. Status unchanged. source ↗ |
| 12 Oct 2026 | WADA 2026 | not prohibited | prohibited (S0) | Not named. S0 covers any pharmacological substance with no current approval by any government for human therapeutic use, and we found no such approval. source ↗ |
Questions
3 ANSWERSIs LL-37 legal in the US?
Not as a drug. LL-37 has no FDA approval, so selling it for human use breaks federal drug law, and a 'research use only' label does not protect a seller whose site signals human use. It is not a controlled substance, and possessing it is not a federal crime. Pharmacies cannot compound it.
Can a pharmacy compound LL-37?
Not eligible. Removed from Category 2 on 15 Apr 2026. FDA says the PCAC will review cathelicidin LL-37 before the end of February 2027; no date set as of 12 Oct 2026.
Is LL-37 banned in sport?
Yes. It is prohibited at all times under WADA 2026 class S0. Not named. S0 covers any pharmacological substance with no current approval by any government for human therapeutic use, and we found no such approval. WADA's 2027 List, in force from 1 Jan 2027, now names 'peptides' among the S0 examples; the status does not change.