LL-37
The only human cathelicidin—a host-defense peptide with antimicrobial and immune-modulating roles in the gut and skin.
Back to all peptides
✨ real molecule sketch
Spotted this on a label?
Human antimicrobial peptide
That’s the INCI name—the official way it appears on the back of your serum or cream. Same ingredient, different marketing names.
Structure (cute edition)
✨ real molecule sketch
This peptide is a short chain of about 4 amino acids—think of it as a tiny protein necklace on your label.
INCI: Human antimicrobial peptide · ~4 amino acids in our simplified view
What brands say it does
LL-37 kills bacteria and modulates inflammation at mucosal surfaces. Low levels are linked to dysbiosis and psoriasis. Research explores it for IBD and wound healing. Not available as a consumer product; studied in academic and clinical trials.
Where you’ll find it
Immunology research, microbiome studies—not retail supplements.
Other names you might see
Cathelicidin
Human antimicrobial peptide
hCAP18 fragment
Educational only—not medical advice. GLP-1 drugs require a prescription; do not source medications online without a clinician.