Peptide COAs Explained: How to Verify Purity Before You Buy
QUALITY GUIDEWhat a Certificate of Analysis is, how to read HPLC and mass-spec results, and how to verify any Flux Labs batch in seconds.
What is a COA?
A Certificate of Analysis is an independent lab's report on one specific production batch. It should name the compound, the batch number, the test method and the measured purity. If a supplier can't show a COA for your batch, you don't actually know what's in the vial.
How to read the HPLC result
HPLC (high-performance liquid chromatography) separates the sample into its components. The main peak is your peptide; smaller peaks are impurities. Research-grade means the main peak is 99%+ of the sample. Every Flux Labs COA shows the full chromatogram, not just a number.
What mass-spec confirms
Mass spectrometry confirms identity: the measured molecular weight must match the peptide's known weight. Purity without identity is meaningless — both tests together prove you have the right compound at the right purity.
Verify your batch in seconds
Every Flux Labs order carries a verification code. Enter it on the Verify page to see the exact COA for your batch. No account needed.
99%+ verified purity, COA on every batch, next-day UAE delivery, cash on delivery available.
Browse the catalog →Frequently asked
What purity should research peptides be?
99%+ by HPLC is the research-grade standard; anything unstated or below is a red flag.
Are Flux Labs COAs independent?
Yes — testing is performed by an outside laboratory, and the report is downloadable per batch.
Can I see a COA before ordering?
Yes, ask via the Contact page and we'll share the current batch report for any compound.