Understand the source comparison
LL-37 Cost Comparison by Supplier Tier and Purity Level
Not all LL-37 peptides perform identically in antimicrobial assays, even when supplier certificates claim equivalent purity. Purity percentage measures the proportion of the primary peak in HPLC. But that peak could be full-length LL-37, a 36-amino-acid deleti
No winner is assigned.
This page preserves a source comparison for education. It does not add a rating, recommendation or clinical judgment.
- Not all LL-37 peptides perform identically in antimicrobial assays, even when supplier certificates claim equivalent purity. Purity percentage measures the proportion of the primary peak in HPLC. But that peak could be full-length LL-37, a 36-amino-acid deletion variant, or a peptide with one substituted residue. The cost difference between supplier tiers reflects what 'purity' actually measures and what verification accompanies each batch. Budget suppliers optimize for cost per gram. Mid-tier suppliers optimize for consistent HPLC purity. Premium suppliers optimize for sequence fidelity and structural integrity across the entire production cycle.
- We've analyzed pricing across verified research peptide suppliers active in early 2026. Budget-tier LL-37 (under $100 per 5mg vial) typically ships with a certificate of analysis showing HPLC purity but no mass spectrometry confirmation and no amino acid analysis. These batches work adequately for preliminary dose-finding studies or mechanism-agnostic work where absolute potency variance is tolerable. Mid-tier LL-37 ($120–$180 per 5mg vial) includes HPLC and mass spec verification, confirming both purity and molecular weight. This catches most synthesis errors but not single-residue substitutions with isobaric amino acids. Premium-tier LL-37 ($200–$250 per 5mg vial) includes full sequencing verification, sterility testing, and endotoxin quantification, making it suitable for immune cell assays where lipopolysaccharide contamination would confound results.
- The pricing gap narrows significantly when calculated per functional dose rather than per milligram. If a budget-tier peptide is 92% pure and 8% consists of deletion sequences with negligible activity, the effective cost per microgram of functional peptide is higher than it appears. A premium-tier peptide at 99% purity with confirmed sequence delivers more usable material per vial. For studies requiring reproducibility across multiple batches. Longitudinal infection models, dose-response curves, or multi-site collaborative research. The cost per reproducible result favors verified peptides even when the upfront price is 2× higher.