LL-37
Also known as: Cathelicidin
LL-37 is the only human cathelicidin antimicrobial peptide — a 37-amino-acid peptide (starting with two leucines) cleaved from the hCAP-18 precursor. It has broad-spectrum antimicrobial activity and immunomodulatory roles, but is also implicated in the pathogenesis of autoimmune and inflammatory skin diseases including psoriasis, rosacea, and lupus. Not FDA-approved; research-use only.
Pricing for LL-37
Live vendor pricing, normalized to $/mg so sizes compare fairly — fused with each seller's Merit trust score and latest independent COA purity. Prices refresh daily.
Average price
$11.85/mg
range $1.96–$29.00/mg
Sellers
43
from $0.00
45-day trend
+2.2%
vs 45-day avg $/mg
37 of 43 sellers have a current price· 23 stale listings hidden (not seen in 7 days)
Top Merit pick
🇺🇸 BioLongevity Labs96via Disclosed Labs · just now
$18.99/mg +60.3% vs avg$94.97
5mg
- 🇺🇸 Ion Peptide95
✓ verified at source · just now
$9.00/mg -24.1% vs avg$45.00
5mg
99.6% purity 5 COAs - 🇺🇸 Orbitrex Peptides95
via Disclosed Labs · just now
$10.00/mg -15.6% vs avg$49.99
5mg
99.8% purity 2 COAs - 🇺🇸 Peptide Tech94
✓ verified at source · 1d ago
$5.00/mg -57.8% vs avg$49.99
10mg
no purity - 🇺🇸 Peptidology89
✓ verified at source · just now
$9.00/mg -24.1% vs avg$45.00
5mg
- 🇺🇸 Verified Peptides86
via Disclosed Labs · just now
$13.14/mg +10.9% vs avg$65.70
5mg
- 🇺🇸 Simple Peptide85
via Disclosed Labs · just now
$5.40/mg -54.4% vs avg$54.00
10mg
- 🇺🇸 EZ Peptides85
✓ verified at source · just now
$7.80/mg -34.2% vs avg$78.00
10mg
99.5% purity 2 COAs - 🇺🇸 Ascension Peptides84
via Disclosed Labs · just now
$8.90/mg -24.9% vs avg$89.00
10mg
- 🇺🇸 MedGe Peptides82
✓ verified at source · just now
$15.00/mg +26.6% vs avg$75.00
5mg
- 🇺🇸 Texpeptide65
✓ verified at source · just now
$8.00/mg -32.5% vs avg$40.00
5mg
no purity - 🇺🇸 Certified Peptides62
✓ verified at source · just now
$17.80/mg +50.2% vs avg$89.00
5mg
no purity 1 COA - peptidetech.isUnscored
via Disclosed Labs · just now
$5.00/mg -57.8% vs avg$49.99
10mg
no purity - realpeptides.coUnscored
via Disclosed Labs · just now
$16.00/mg +35% vs avg$80.00
5mg
no purity
Prices observed from public storefronts (last 24h), normalized to $/mg. "Evidence" is Merit's 0–100 Merit Score, derived only from observable verification evidence (methodology on /about); "Purity" is the latest independent COA. Some buy links are affiliate links — Merit may earn a commission at no extra cost to you, and where a vendor offers one, the code shown gets you a discount at their checkout. Affiliate status never affects price data, ranking, or the Merit Score (full policy on /disclosure). Research use only.
COAs for LL-37
41 third-party tests across 11 vendors. Each card links to the full report.
For
LL-37
by Ion Peptide· batch L375-06092026
For
LL-37
by Verified Peptides· batch LL05260305C
For
LL-37
by Verified Peptides
For
LL-37
by Verified Peptides· batch LL025602005C
For
LL-37
by Real Peptides· batch Black Cap
For
LL-37
by Ion Peptide· batch LL375-03232026
For
LL-37
by Ion Peptide· batch LL375-03232026
For
LL-37
by EZ Peptides· batch EZP-LL371002172026-01
For
LL-37
by EZ Peptides· batch EZP-LL37100217-2026-01
For
LL-37
by Peptidology· batch 1669
For
LL-37
by Ruo Bio
For
LL-37
by Simple Peptide· batch L1-05-01162026-J
For
LL-37
by Simple Peptide· batch LL10-37011220236-J
For
LL-37
by MedGe Peptides· batch LL375LT12
For
LL-37
by MedGe Peptides· batch LL375LT12
For
LL-37
by Simple Peptide· batch LL37L2092025-J
For
LL-37
by Orbitrex Peptides· batch LL5126
For
LL-37
by Orbitrex Peptides
For
LL-37
by Real Peptides
For
LL-37
by Kimera Chems· batch KC-L37-BLU1
For
LL-37
by Mile High Compounds· batch LL3-005-MH-01
For
LL-37
by Mile High Compounds· batch LL3-005-MH-01
For
LL-37
by BioLongevity Labs· batch 251549
For
LL-37
by Skye Peptides· batch LL25-04-002
20 citations indexed for LL-37
review · 2026
LL-37: Biological Mechanisms and Emerging Therapeutic Applications in Intestinal Disease
Human cathelicidin peptide LL-37 is encoded by the CAMP gene and plays a key role in innate immunity. It maintains intestinal homeostasis through antibacterial, immunomodulation, and tissue repair functions.
Study · 2026
LL-37 and citrullinated-LL-37 enhances oxylipins: citrullination attenuates LL-37-mediated COX-2-dependent chemokine response in human bronchial epithelial cells
BACKGROUND: During airway inflammation, chemokines, oxylipins (bioactive lipids) and cationic host defence peptides (CHDP) are enhanced in the lungs. However, the interplay of these molecules in the process of airway inflammation is not fully resolved.
review · 2026
β-Amyloid (Aβ) and Human Cathelicidin LL-37: Two Sides of the Same Coin?
review · 2026
β-Amyloid (Aβ) and Human Cathelicidin LL-37: Two Sides of the Same Coin?
Physiologically produced circulating β-amyloid (Aβ) exerts critical physiological functions. Although Aβ is a key player in Alzheimer's disease (AD), it may initially be beneficial at the onset of infection.
Study · 2026
[Evaluation of Serum LL-37 Levels in Patients with Brucellosis and Their Relationship with Clinical Course]
This study aimed to determine the serum levels of the LL-37 molecule, associated with the pathophysiology of Brucellosis, in patients diagnosed with Brucellosis and to investigate the relationship between these levels and the clinical course of the disease.
animal · 2026
Combined nonoxynol-9 and antimicrobial peptide LL-37 for barrier contraception
Abstract Birth control and sexually transmitted infections are global concerns. Nonoxynol-9 (N-9) is the most commonly used component in spermicides, with controversial safety and efficacy. LL-37 has been considered the most promising antimicrobial peptide for developing spermicides.