Compare Peptides
Select any two compounds for a side-by-side comparison of mechanism, uses, risks, and FDA regulatory status.
Popular comparisons
LL-37
Cathelicidin, Human Cathelicidin Antimicrobial Peptide
The only human cathelicidin antimicrobial peptide, LL-37 is a 37-amino-acid peptide naturally produced by immune cells, epithelial cells, and barrier tissues. It plays a critical role in innate immunity by directly killing bacteria, viruses, and fungi, while also modulating inflammatory responses. Increasingly studied for chronic infections, biofilm disruption, and immune regulation.
A synthetic 15-amino acid peptide derived from a protective protein found in human gastric juice. One of the most widely researched peptides for tissue repair and recovery.
Disrupts microbial membranes through electrostatic interaction with negatively charged bacterial surfaces, creating pores that kill pathogens. Also modulates immune responses by recruiting immune cells, promoting wound healing, and disrupting bacterial biofilms. Acts as a bridge between innate and adaptive immunity.
BPC-157 promotes angiogenesis (new blood vessel formation), upregulates growth factor expression, and modulates nitric oxide synthesis. It appears to accelerate healing of tendons, ligaments, muscles, and the GI tract through multiple pathways including the FAK-paxillin pathway.
- Immune system support
- Chronic infection management
- Biofilm disruption (Lyme, SIBO)
- Wound healing
- Upper respiratory infection support
- Tendon and ligament repair
- Gut healing and GI protection
- Muscle injury recovery
- Joint health
- Post-surgical recovery
- Injection site reactions (pain, redness)
- Potential autoimmune activation at high doses
- Limited human clinical data for therapeutic use
- Overexpression linked to psoriasis and rosacea in some contexts
- Limited human clinical trial data
- Most research is animal-based
- Potential interactions with blood pressure medications
- Injection site reactions
- Long-term safety profile unknown
Not FDA-approved as a therapeutic. LL-37 is an endogenous human peptide being studied in clinical trials for wound healing and infection. Some compounding pharmacies have offered it, but it has no formal FDA category for compounding. Research is ongoing for topical wound applications.
On April 15, 2026, the FDA announced BPC-157 will be removed from the Category 2 'significant safety risks' list effective April 22, 2026. It is now scheduled for formal PCAC (Pharmacy Compounding Advisory Committee) review on July 23, 2026, to determine whether it should be added to the 503A bulk drug substances list. Removal from Category 2 does not authorize compounding — pharmacies should exercise caution until PCAC issues its recommendation. Previously reclassified to Category 1 in February 2026, a step that is now superseded by this more formal process.
PCAC: July 23, 2026
This comparison is for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before starting any peptide therapy.