Questions to Ask Before a Peptide Qualification Order

Problem definition

The first order should answer a question: can this supplier repeatedly provide research material with documents you can defend internally? If the first order is treated as a casual sample purchase, failures become expensive and unclear.

This questionnaire is for lawful B2B laboratory procurement planning. It is not an import-permit service and not medical advice. Destination legality remains the buyer's responsibility.

Block 1 — Intended use and compliance posture

Ask your internal stakeholders:

1. What is the lawful intended use (analytical research, method development, reference comparison, formulation research, or another lawful B2B purpose)? 2. Who is the importer of record? 3. Has destination classification and licensing been reviewed by qualified counsel or a broker? 4. Are consumer / human-use claims prohibited in all customer-facing and shipping text?

Do not use personal-use or self-injection options in B2B sourcing files.

Block 2 — Material identity

5. What common name, aliases, and sequence (if applicable) are required? 6. Is a CAS number reliable for this item, or should identity rest on sequence / structure documents? 7. What physical form and fill size are required? 8. Which attributes are mandatory for release: identity, chromatographic purity, content, water, solvents, bioburden, endotoxin, sterility?

Cross-check public identity references such as PubChem when useful, but never treat a database page as batch proof.

Block 3 — Supplier and document package

9. What is the legal selling entity? 10. Who manufactures the lot? 11. Which documents are due before payment vs before shipment vs with shipment? 12. Will chromatograms / spectra be included? 13. Which laboratory issues the COA, and has its scope been checked?

Block 4 — Commercial and logistics terms

14. What Incoterms and named place apply? 15. Who pays duties, taxes, and inspection fees? 16. What packaging and temperature controls are required? 17. What is the maximum acceptable transit time for your use case? 18. What is the written remedy if the lot fails independent testing?

Block 5 — Independent testing plan

19. Which lab will test the retained sample? 20. Which methods and acceptance criteria apply? 21. Who pays for testing? 22. How will out-of-spec results be documented and communicated?

See Testing checklist and HPLC vs LC-MS.

Minimum output before you send payment

Create a one-page qualification brief containing:

• - Supplier legal name and status classification
• - Product identity fields
• - Document list
• - Incoterms
• - Testing plan
• - Go / no-go criteria

If any of those lines are blank, the order is premature.

Related guides

• - How to verify a peptide supplier
• - Shipping documentation
• - DDP vs DDU
• - Request supplier matching

Regulatory references such as FDA databases or EMA guidelines help buyers understand analytical and development context. They do not approve a research supplier, catalog vial, or individual shipment.