Source comparison
PT-141 Purity Comparison: Research-Grade vs. Generic Peptides
Research-grade suppliers (Real Peptides, Peptide Sciences) 98–99.5% Third-party COA provided with batch number before purchase Full lot traceability with synthesis date and testing date MS confirmation included in standard COA Best choice for reproducible rese
This comparison does not assign a generated winner or score.
- Research-grade suppliers (Real Peptides, Peptide Sciences)
- 98–99.5%
- Third-party COA provided with batch number before purchase
- Full lot traceability with synthesis date and testing date
- MS confirmation included in standard COA
- Best choice for reproducible research. Purity and documentation meet pharmaceutical standards
- Mid-tier generic suppliers
- 90–96%
- COA available on request, often recycled across batches
- Batch numbers present but may not match provided COA
- MS testing inconsistent or absent
- Acceptable only if COA is verified and batch-specific. Risk of impurities increases below 95%
- Discount peptide vendors
- 70–92% (when tested independently)
- No COA, or generic 'purity certificate' without chromatogram
- No batch tracking or lot numbers
- No MS confirmation
- Unacceptable for research use. Purity claims unverifiable and contamination risk high