Short answer: A Certificate of Analysis (COA) is an independent lab report proving a kratom batch’s identity, potency and safety. Never buy from vendors who won’t share them.
What a COA shows
- Potency: mitragynine / 7-OH percentages
- Microbials: PASS for salmonella, E. coli, mold
- Heavy metals: within safe limits
- Batch match: lot number = your package
Red flags
In-house (not independent) testing, missing batch numbers, outdated reports, or “COA available soon” forever. We publish per-batch testing — see Lab Testing & COA and our promise. More: FAQ. Adults 21+ only.