Quality
Understanding Peptide Purity
REPRIME Research·18 Jan 2026·6 min read
Purity isn't a single number. Here is how REPRIME thinks about identity, purity, and what the numbers on a COA actually mean.
Purity reporting can obscure as much as it reveals. This article walks through what an HPLC purity figure actually measures, the difference between identity and purity, and how to read a Certificate of Analysis without being misled.
Identity vs purity
Identity confirms the molecule is what the label says. Purity quantifies what fraction of the material is that molecule. Both numbers belong on every COA.
REPRIME quality program
Every batch is independently tested. The COA is public on the product page and in our Certificates repository.
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