COA literacy
How to Read a COA
A buyer-friendly guide to interpreting lot number, identity, purity, testing method, and document date fields on a certificate of analysis.
COA field
What it means
What to check
Product name
Identifies the compound referenced by the document.
Match it to the product page and label.
Lot number
Connects the document to a specific batch.
Match the label lot to the COA lot.
Purity data
Provides analytical quality context for that batch.
Review alongside testing method and date.
Testing method
Shows the analysis type used for documentation.
Use it to understand the evidence shown.
Use this page as a trust bridge
Link this guide from product pages, COA verification, quality standards, and checkout-adjacent educational content.