A practical 20-point checklist to evaluate any peptide supplier before placing an order. Work through it once per vendor and keep the result on file.

Identity and transparency

  • 1. Verifiable registered company name and physical address
  • 2. Working email, phone, and responsive technical support
  • 3. Clear “about” information and real facility or team details
  • 4. No therapeutic or “for human use” claims

Quality and documentation

  • 5. Lot-specific certificate of analysis available on request
  • 6. HPLC purity reported with a chromatogram trace
  • 7. Mass-spectrometry identity confirmation
  • 8. Independent third-party testing where claimed
  • 9. Stated purity grade and peptide content
  • 10. Endotoxin, sterility, or residual-solvent data where relevant

Product and pricing

  • 11. Accurate labels with sequence, size, and lot number
  • 12. Transparent price per milligram of active peptide
  • 13. MOQ and wholesale/volume terms clearly published
  • 14. Realistic market pricing (not far below competitors)

Logistics and service

  • 15. Insulated, cold-chain packaging
  • 16. Same-day or clearly stated dispatch time
  • 17. Tracking and reliable international shipping to your country
  • 18. Clear replacement and failed-lot policy
  • 19. Positive, verifiable buyer history
  • 20. Correct research-use labeling and export paperwork

A supplier that fails several documentation items—especially CoA, HPLC, or identity testing—should be disqualified regardless of price.