Certificate of Analysis
A lab document showing what's actually inside a specific product batch.
A Certificate of Analysis (CoA) is a per-batch lab report from an independent testing facility. It typically lists:
- Active ingredient assay (does the bottle contain the dose claimed?)
- Heavy metals (lead, arsenic, cadmium, mercury) below regulatory limits
- Microbial contamination (yeast, mold, salmonella, E. coli)
- Pesticide and solvent residues
Reputable supplement brands publish CoAs for every batch on their site. On a deal page on VitaminDB, look for the violet "CoA" badge — submitter or moderator has attached a public link.
A missing CoA isn't proof of bad quality, but a published one shifts the trust burden the right way.