BPC-157 vs LL-37
Two gut-research staples compared: the systemic tissue-repair peptide vs the body's own antimicrobial peptide. Here's a neutral, sourced side-by-side — no hype, every claim links to its evidence.
BPC-157
ResearchAlso: Body Protection Compound, PL 14736
BPC-157 is a man-made copy of a tiny piece of protein. It comes from something found in the juice of your stomach.
LL-37
ResearchAlso: LL-37 , CAS: 154947-66-7, antimicrobial peptide, LL-37, human acetate
LL-37 is a natural germ-fighting substance that your own body makes. It is a tiny chain of building blocks called amino acids.
At a Glance
| BPC-157 | LL-37 | |
|---|---|---|
| Research status | Preclinical | Preclinical |
| Highest-tier evidence | Peer-reviewed study | Peer-reviewed study |
| Research citations | 50 | 10 |
| Dosing routes | SubQ | SubQ |
| Receptor targets | Growth Hormone Receptor, VEGF | bacterial membranes, TLR3/TLR9, formyl-peptide receptors |
| Half-life | No established half-life in humans; preclinical data only. | — |
| Known side effects | 28 | 11 |
Research Areas
Top preclinical research areas — cited studies for each.
BPC-157
- Tendon/ligament repair
- Angiogenesis
- Anti-inflammatory
LL-37
- Antimicrobial host defense
- Immunomodulation
How People Use It
Reported routines — research only, not medical advice.
BPC-157
- SubQ — 5 mg BPC-157 + 5 mL BAC water
- SubQ — Daily
- SubQ — BPC-157 250–500 mcg/day SC + TB-500 2–5 mg twice weekly for 4–6 week loading, then TB-500 2 mg weekly for 4–8 weeks
LL-37
Not yet documented for LL-37 — being compiled.
The Evidence
Key studies — click through to verify each on PubMed.
BPC-157
50 sourced studies
- Source
The promoting effect of pentadecapeptide BPC 157 on tendon healing involves tendon outgrowth, cell survival, and cell migration.
In vitro2010 Key study 85/100Rated 85/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
Gastric pentadecapeptide body protection compound BPC 157 and its role in accelerating musculoskeletal soft tissue healing.
Review2019 80/100Rated 80/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
Pentadecapeptide BPC 157 enhances the growth hormone receptor expression in tendon fibroblasts
In vitro2018 84/100Rated 84/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
Regeneration or Risk? A Narrative Review of BPC-157 for Musculoskeletal Healing
Review2025 76/100Rated 76/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology →
LL-37
10 sourced studies
- Source
The human cathelicidin LL-37: a multifunctional peptide involved in infection and inflammation in the lung.
Review2005 80/100Rated 80/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
LL-37 | C205H340N60O53 | CID 16198951 - PubChem
95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
Efficacy and safety of Oral LL-37 against the Omicron BA.5.1.3 variant of SARS-COV-2: A randomized trial
95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
Evaluation of LL-37 in healing of hard-to-heal venous leg ulcers: A multicentric prospective randomized placebo-controlled clinical trial
95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology →
Decision Guide
How to Choose
Neither is a “winner” — they suit different goals. Compare the documented benefits and evidence above against what you’re actually trying to achieve, note the research status (approved vs research-stage), and read each full guide before deciding. Many people also stack peptides rather than pick one.
Source BPC-157
Shop BPC-157Source LL-37