Not medical advice. Talk to your provider before using any peptide.
Full disclaimerPeptide Schedule Research TeamReviewed Apr 20269 Citations
LL-3737 residuesLLGDFFRKSKEKIGKEFKRIVQRIKDFLRNLVPRTESEach bubble = one amino acid. Size = residue mass. Color = chemical class.LL-37 is the body's only cathelicidin antimicrobial peptide, backed by three human wound healing trials. It breaks down biofilms that antibiotics can't touch. All clinical data is topical; subcutaneous injection remains community-driven. Research peptide, not FDA approved at any concentration.
50mcg · Daily
Summary: Add 2mL BAC water to your 5mg vial. Draw to 2.0 units on a U-100 syringe for a 50mcg dose. This vial will last 100 doses.
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| Level | Dose / Injection | Frequency |
|---|---|---|
| Beginner | 50mcg | Daily |
| Moderate | 100mcg | Daily |
| Aggressive | 200mcg | Daily |
Reconstitution math for a 5 mg vial with 2 mL bacteriostatic water: total volume is 200 units on an insulin syringe. Each unit delivers 25 mcg. So 50 mcg is 2 units, 100 mcg is 4 units, 125 mcg is 5 units, 200 mcg is 8 units. Start at 50 mcg daily (2 units) for the first week regardless of experience level. LL-37 is potent enough that skipping the titration week creates unnecessary risk. The dosing frequency listed in most structured references is 2 to 3 times per week. Community consensus and pharmacological logic both point to daily dosing. With a systemic half-life under 30 minutes, twice-weekly injections leave zero circulating peptide between doses. Source matters more with LL-37 than many peptides. Request HPLC purity certificates showing 98% or higher and mass spectrometry confirmation of the correct molecular weight (4493.3 Da). Endotoxin (LAL) test certificates are non-negotiable for any antimicrobial peptide. Verify the vendor uses solid-phase peptide synthesis, not E. coli expression systems that carry LPS contamination risk. Reconstituted vials go in the refrigerator at 2 to 8 degrees Celsius. Use within 4 weeks. Discard if you see particles, cloudiness, or color change.
Dosing based on Community consensus dosing: limited human data — 10 published references.View all sources →
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Pricing updated 2026-04-09
Prices are estimates and vary by source, location, and prescription status.Full pricing breakdown →
Disclaimer: This curve is a simplified first-order exponential decay model. Actual pharmacokinetics vary based on injection site, individual metabolism, body composition, and other factors. Half-life values are approximate and based on available preclinical and clinical literature. Many research peptides lack formal human pharmacokinetic studies. This is for educational purposes only — not medical advice.
LL-37 is the body's only cathelicidin antimicrobial peptide, backed by three human wound healing trials. It breaks down biofilms that antibiotics can't touch. All clinical data is topical; subcutaneous injection remains community-driven. Research peptide, not FDA approved at any concentration.
