Compare 1
Batch match
SpecificityCheck whether the file appears tied to a particular listing or whether it looks reused across many products.
Education guide
How to compare peptide COAs
Two COAs can look similar on the surface while telling very different stories. The most useful comparison points are traceability, timing, readability, and how well the file matches the listing.
Compare 2
Test timing
DateLook at when the document was issued and whether the page makes that timing easy to understand.
Compare 3
Method visibility
ContextStronger files show enough method information to explain what was measured instead of relying on headline numbers alone.
Compare 4
Page consistency
MatchThe document should fit the naming, labeling, and listing details shown on the page itself.
Why this matters
COAs work best when compared side by side with the listing.
It helps to open the product page, the supporting file, and another supplier page at the same time. That makes it easier to spot mismatched details, generic files, or stronger documentation habits.