A shortlist you can explain.
Compare documents and unanswered questions. This worksheet does not rank or endorse suppliers.
Download the editable comparison sheet (.csv)
1. Identify the supplier and material
Supplier: ____________________ Date: ____________________
Compound / lot: ____________________ Reviewer: ____________________
2. Record the evidence
| Check | Document or source + date | Verified / unanswered |
|---|---|---|
| Legal business and contact details | ||
| Business location / fulfillment / claimed manufacture | ||
| Lot number and sample identity | ||
| Laboratory, report ID and verification | ||
| Identity test and result | ||
| Purity method and result | ||
| Quantity / content method and result | ||
| Other tests required by your laboratory | ||
| Shipping, refund and dispute terms | ||
| Specific concerns, source and supplier response | ||
| Commercial relationship or commission |
3. Make a bounded conclusion
What did the documents establish? ___________________________________
What remains unverified? ___________________________________________
What would change this assessment? _________________________________
How to use it
Keep a copy for each supplier. Distinguish a supplier’s claim from an independently verified document. A missing report is an open question, not automatic proof of misconduct. Popularity is not a substitute for testing. Have your laboratory determine whether the evidence matches its requirements.
The Peppers Index is affiliated with Ntegrity Labs. Apply the same checklist to affiliated suppliers. September 12, 2026.