How to read a peptide COA
Last updated: 11 September 2026
Every serious peptide seller claims third-party testing. A certificate of analysis (COA) is the document behind the claim, and most people never open one. Here is what a COA should contain, what each section means, and how to check ours against the pen in your hand.
The four things to check
Identity: the analysis should name the exact compound and confirm it by mass spectrometry (see HPLC vs mass spectrometry). The measured molecular mass should match the theoretical mass of the peptide sequence.
Purity: expressed as a percentage from HPLC (high-performance liquid chromatography). The number matters, but so does the chromatogram: a clean single dominant peak is the visual signature of a pure product (more on what a purity percentage proves).
Batch: a COA without a batch number is marketing, not evidence. The certificate must be traceable to the specific production lot you received (see how to match a certificate to your pen).
Issuer: the testing should be done by a laboratory independent of the seller (see what third-party testing means).
Checking a Body Pharm COA
Every batch we sell is tested by an independent laboratory, and every pen carries a QR code linked to its batch. Scan the code and compare the batch number on the certificate with the one printed on your pen. The full current set of certificates is on the COA index, as plain PDFs; unfamiliar terms are in the glossary of testing terms.
Browse all certificates of analysis →
Frequently asked questions
Where are Body Pharm’s COAs?
On the COA index (linked below) as plain PDFs, one per batch, and via the QR code on each pen, which opens the certificate for that pen’s batch.
What purity figure should a peptide certificate show?
Reputable sellers publish HPLC purity of 98% or higher for the compounds we stock. Treat a missing purity figure, a missing method or a missing batch number as a warning sign.
This page is educational and intended for research and informational use only. It is not medical advice, a treatment recommendation, or dosing guidance, and it makes no claims about outcomes. Body Pharm EU supplies research-grade materials for laboratory use. These statements have not been evaluated by the EMA.