Vendor Evaluation — A Researcher Checklist
Practical signals researchers use when assessing a research-peptide supplier.
Documentation
- Per-lot Certificate of Analysis from a third-party laboratory.
- HPLC purity ≥99% with chromatogram attached.
- Identity verification by mass spectrometry.
- Clear lot-number labeling on both COA and physical packaging.
Operational signals
- Domestic shipping with reasonable lead times.
- Transparent return / replacement policy for damaged or short-shipped lots.
- Lyophilization and packaging consistent with research-grade norms.
Editorial signals
- Clear research-use framing on product pages — no human-use claims, no dosing instructions.
- Accurate compound descriptions and structural information.
- Independent reviews and a track record across multiple lots.
See also our blog post "How to Evaluate a Research Peptide Supplier" for a more narrative walkthrough.