COA Checklist
- Lot number matches your vial
- Method (HPLC/LC‑MS) and chromatogram present
- Purity with acceptance criteria
- Assay date & lab ID
- Storage and stability notes
Red Flags
- Generic PDFs reused across lots
- No method detail
- Mismatch between label and COA
Pro Tip
Archive COAs and photos of packaging. Keep an audit trail for replacements.