Distributor first-PO checklist: peptide documents to request before buying

A distributor's first peptide purchase should validate the supplier's documentation chain before volume terms are negotiated. The goal is not to collect paperwork for its own sake; it is to prove that the supplier can connect the specific lot being offered to identity, purity, storage, regulatory, and shipment records.

What documentation should a distributor request before a first peptide PO?

Before a first peptide PO, a distributor should request a batch-specific COA, HPLC chromatogram, mass-spec identity report, counter-ion and water content, residual-solvent screen, storage and retest dates, SDS, product specification sheet, manufacturer identity, and destination-market notes. For injectable-route or regulated workflows, add LAL endotoxin, microbial limits, stability data, and audit-support documents.

First-PO document set

Ask for the exact lot intended for shipment where possible. If inventory is not allocated yet, ask for a recent representative lot and confirm that the final lot will ship with the same scope.

• Batch-specific COA with lot number, manufacture date, retest date, and signed release
• HPLC chromatogram with integration table and method conditions
• Mass-spec report with theoretical vs observed molecular weight
• Counter-ion, water content, and residual-solvent results
• SDS, product specification sheet, storage condition, and shipping condition
• Manufacturer identity and facility-level contact path for QA questions
• Destination-market notes for the buyer's import or resale jurisdiction

When to request add-on evidence

For pharmacy, clinical-adjacent, injectable-route, or high-value recurring supply, request LAL endotoxin, USP microbial limits, stability summary, retain-sample policy, deviation/OOS history for the lot if available, and supplier audit support. If the supplier cannot provide these at any price, the issue is capability, not paperwork timing.