Understand the source comparison
Document VIP Research: Peptide Purity Comparison
Reputable 503B Facility Full HPLC chromatogram + MS trace provided with every COA Batch lot numbers printed on vials match COA lot numbers; COAs dated within 30 days of synthesis Yes. MS trace shows molecular weight ±0.5 Da of theoretical value Gold standard f
No winner is assigned.
This page preserves a source comparison for education. It does not add a rating, recommendation or clinical judgment.
- Reputable 503B Facility
- Full HPLC chromatogram + MS trace provided with every COA
- Batch lot numbers printed on vials match COA lot numbers; COAs dated within 30 days of synthesis
- Yes. MS trace shows molecular weight ±0.5 Da of theoretical value
- Gold standard for research-grade material; meets GLP traceability requirements
- Generic Online Supplier
- COA lists purity percentage only; no chromatogram attached
- Lot numbers present but COA date often 6+ months prior to shipment
- Rarely. MS data available 'upon request' but not standard
- Insufficient for peer-reviewed research; purity claims unverifiable without raw data
- Compounding Pharmacy (Non-503B)
- Purity listed but integration parameters not disclosed
- Batch traceability inconsistent; some suppliers reuse lot numbers across months
- No. Molecular weight confirmation not standard practice
- Acceptable for preliminary studies only; cannot confirm molecular identity
- Research Institution In-House Synthesis
- Full analytical suite (HPLC, MS, amino acid analysis) performed internally
- Complete synthesis and purification logs maintained per GLP standards
- Yes. MS, NMR, and sometimes circular dichroism data available
- Highest confidence level; full analytical control and documentation