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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 OutletPicks, 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.