Antimicrobial host-defense peptide studied for stubborn infections, biofilms, and wound healing.
LL-37 is the only human cathelicidin — a natural antimicrobial host-defense peptide that is part of your innate immune system. It punches holes in bacterial membranes, disrupts biofilms, signals the immune system and supports wound healing.
Researchers are interested in it precisely because it attacks microbes physically rather than chemically, which makes resistance harder to develop — relevant for stubborn infections and biofilm-related problems where conventional antibiotics struggle.
It is a double-edged molecule: dysregulated LL-37 is implicated in some inflammatory skin conditions (like rosacea), so it can irritate, and it should be approached cautiously — especially by anyone with autoimmune disease.
Disrupts bacteria and biofilms that resist standard antibiotics.
Well-characterized mechanism; mostly preclinical for therapeutic use
Supports closure and defense of wounds.
Preclinical and mechanistic support
Modulates innate immune responses.
Documented mechanism; clinical use experimental
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Mostly preclinical (animal/in-vitro) evidence with a clear mechanism. Human effects are largely anecdotal.
Men exploring support for stubborn infections, biofilms or wound healing
Can cause injection-site irritation. Use short cycles. Caution with autoimmune conditions.
Women interested in antimicrobial/immune support or wound healing
Limited female-specific data; can aggravate some inflammatory skin conditions. Avoid with active autoimmune disease and in pregnancy without guidance.
Limited female-specific data.
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Avoid with active autoimmune disease without medical guidance.
Can cause injection-site irritation.
Limited human data — use short cycles.
Standardized data for LL-37 is limited. These are the general effects to watch for with this type of compound.
Rotate sites, use sterile technique, let alcohol dry before injecting.
Hydrate and ease the dose; usually transient as your body adjusts.
Individual responses vary. Stop and consult a clinician for severe, persistent, or unexpected reactions.
14 steps with photos, pro tips, and a dosing calculator.
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View Full GuidePepCompass provides educational information only. Nothing on this platform constitutes medical advice, diagnosis, or treatment. All content is for informational and research purposes only. Always consult a licensed healthcare provider before starting any peptide protocol. Individual results vary.