LL-37
Cathelicidin · hCAP-18 fragment
Host-defense peptide. High-risk; easy to overshoot.
The only human cathelicidin. Antimicrobial and immunomodulatory, but it can also be pro-inflammatory and has been implicated in autoimmune flares (e.g. psoriasis, rosacea) when dysregulated.
Usual range
50–200 mcg
Schedule
Once daily, short course
Half-life
Short
How it is used
Host-defense peptide. High-risk; easy to overshoot.
Subcutaneous
Morning. Stop if rash, dyspnea, or systemic inflammation appears.
1–2 weeks. Do not run chronically.
How to mix this vial
Typical vial 5 mg · 5 mL BAC
5 mg + 5 mL → 1 mg/mL. 50 mcg = 5 units. Start at the floor. This is not a ‘more is better’ peptide.
Fridge. Handle as a short-dated research vial.
Side effects
- Inflammatory flares
- Injection-site pain
- Systemic flu-like feeling
- Autoimmune exacerbation
Who should skip this
- Psoriasis, rosacea, SLE, and most autoimmune disease
- Pregnancy
- Sepsis without a hospital
Nutrition note
Irrelevant next to the safety profile. Do not combine with other immune stimulants.
One of the easiest peptides to misuse. Listed for completeness, not encouragement.
Peptipedia is an educational calculator, not medical advice. Many catalog entries are unapproved for human use. Approved molecules have labels that outrank this app. Do not use this to self-prescribe. Consult a licensed clinician. Not for anyone under 18, pregnant, or being treated for cancer.