Amazon COA Review Process: How It Works
- Ingredient name match — "Magnesium Glycinate" on COA must match the label exactly
- Amount match — COA reports actual measured amounts; label must reflect within tolerance
- Source form match — "as Magnesium Glycinate" or just "Magnesium" — must be consistent
- Daily Value calculation — %DV must match FDA Daily Values reference
- Third-party verification — COA from ISO 17025-accredited lab is preferred
Amazon reviews every dietary supplement listing against a Certificate of Analysis (COA) from a third-party lab or the contract manufacturer. The review checks: