Peptide Vendor Verification Checklist
A comprehensive 10-point system for evaluating peptide supplier legitimacy before purchasing.
Bookmark This Page - Use this checklist every time you evaluate a new vendor. A vendor should pass at least 8 of 10 criteria.
Interactive Checklist
Check items as you verify each point. Your score appears below.
0/10
Check items above to calculate vendor score
Detailed Verification Guide
1. Third-Party Lab Testing
The most critical factor. A reputable vendor will have their peptides tested by an independent laboratory, not just in-house testing. Look for:
- HPLC Testing - Shows purity percentage (should be 98%+ for most peptides)
- Mass Spectrometry - Confirms the molecular identity is correct
- Named Laboratory - Lab should be identifiable and contactable
2. Batch-Specific Documentation
Generic or template COAs that apply to all products are a major red flag. Request the specific COA for the batch you'll receive before purchasing.
Red Flag: If a vendor cannot provide batch-specific documentation, or all their COAs look identical regardless of product, proceed with extreme caution.
3. Verifiable Business Information
Steps to verify:
- Search for business registration in their stated location
- Verify the physical address exists (Google Maps/Street View)
- Call the phone number to test responsiveness
- Check domain registration date (WHOIS lookup)
4. Community Reputation
Where to research vendor reputation:
- Reddit - r/Peptides, r/researchchemicals (search vendor name)
- Peptide Forums - Dedicated peptide discussion boards
- Independent Review Sites - Third-party aggregators
Be wary of vendors with only positive reviews on their own site and no external presence.
5-10. Additional Verification Points
See the checklist above for remaining criteria. Each point helps build a complete picture of vendor trustworthiness.
Questions to Ask Before Purchasing
- "Can you provide the COA for the specific batch I'll receive?"
- "Which laboratory performs your third-party testing?"
- "What is your return/refund policy if there are quality issues?"
- "How long have you been in business?"
- "What purity level should I expect?"
Pro Tip: A legitimate vendor will welcome these questions and provide detailed answers. Evasive or vague responses are a warning sign.