Home › Guides › COA Batch Numbers: Why They Have to Match Your Vial By TorontoHealth Editorial · Updated July 7, 2026
COA Batch Numbers: Why They Have to Match Your Vial
The core idea: A COA only describes the specific batch it was run on. If the batch number on the certificate doesn't match the number on your vial, the report isn't about your product.
Why batch matching matters
A clean report for a different lot tells you nothing about the vial in your hand. The number is the link between the paper and the product.
Where to find the number
It's usually printed on the vial label and stated on the COA. Both should agree, and ideally verify on the lab's own portal.
If they don't match
A mismatch means the certificate describes some other batch. Regard that as an unanswered question, not a pass.