Understand the source comparison
KPV Real vs Fake: Authentication Comparison
Supplier CoA Review Purity ≥98% per HPLC, correct molecular weight, endotoxin <10 EU/mg No CoA provided, or CoA from 'in-house lab' only $0 (should be free) Immediate Required first step. If supplier won't provide CoA, do not purchase Visual Inspection (Pre-Re
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This page preserves a source comparison for education. It does not add a rating, recommendation or clinical judgment.
- Supplier CoA Review
- Purity ≥98% per HPLC, correct molecular weight, endotoxin <10 EU/mg
- No CoA provided, or CoA from 'in-house lab' only
- $0 (should be free)
- Immediate
- Required first step. If supplier won't provide CoA, do not purchase
- Visual Inspection (Pre-Reconstitution)
- Lyophilisation quality, storage integrity, contamination absence
- Yellow/brown discolouration, fluffy dispersed powder, loose crimp seal
- $0
- Fastest rejection filter. Catches 60–70% of degraded peptides before use
- Reconstitution Test
- Solubility, aggregation absence, formulation correctness
- Fails to dissolve in 90 seconds, cloudiness, visible particulates
- 2 minutes
- Simple functional test. If it doesn't dissolve cleanly, it won't perform consistently
- Independent HPLC Analysis
- Definitive purity percentage, molecular weight confirmation
- Purity <95%, incorrect molecular weight, multiple peaks in chromatogram
- $150–$400 per sample
- 5–10 business days
- Gold standard. Only method that definitively proves peptide identity and purity
- Amino Acid Analysis (AAA)
- Correct amino acid ratio (1:1:1 Lys:Pro:Val)
- Ratio deviates >5% from expected, presence of unexpected amino acids
- $100–$250 per sample
- 7–14 business days
- Confirms composition but not purity. Use when HPLC unavailable