Compound Library

Peptide / Immune

LL-37 (Cathelicidin)

Human host defence peptide. Broad-spectrum antimicrobial, immunomodulatory, and wound healing properties. Kills bacteria, fungi, and viruses by membrane disruption. Anti-biofilm activity. Promotes keratinocyte migration for wound closure. Intranasal for respiratory infections, SubQ for systemic immune support.

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Educational reference only. This page does not diagnose, prescribe, or replace care from a licensed professional. Laws, availability, and clinical appropriateness vary by location.
Reference dose100–500 mcg SubQ or intranasal daily
Half-life1 hours
Risk flaglow
Regulatory noteResearch-only flag

Side effects and watch-outs

  • Injection site pain and redness (most common)
  • Nausea at higher doses
  • Intranasal: temporary nasal burning
  • Pro-inflammatory at high doses (hormetic — low doses anti-inflammatory)
  • Generally well tolerated at standard research doses