Understanding Certificates of Analysis (COA) for Research Peptides
A Certificate of Analysis (COA) is a document issued by a laboratory confirming the identity and purity of a compound. For research peptides, a genuine third-party COA is one of the strongest signals of quality and transparency. Here is how to read one.
What a COA contains
A typical COA includes the compound identity, the testing method used (such as HPLC and mass spectrometry), the measured purity percentage, and the date of analysis. It should also identify the laboratory that performed the testing.
- Compound name and batch identifier
- Testing methods (HPLC, MS)
- Measured purity (e.g. 99%+)
- Issuing laboratory and date
Why third-party testing matters
A COA produced by an independent laboratory carries more weight than one produced in-house, because there is no conflict of interest. Blind testing — where the lab is not told what the compound is in advance — provides an even stronger guarantee of authenticity.
Verifying authenticity
Look for COAs that name a reputable laboratory and that match the specific batch you received. Suppliers who make COAs readily available for every product demonstrate a commitment to transparency.
Research Use Only
This article is for educational and informational purposes only. Research peptides are intended strictly for laboratory and in-vitro research and are not approved for human consumption. Always follow relevant regulations and scientific literature.
Read Next
How to Reconstitute Peptides: A Step-by-Step Research Guide
A practical walkthrough of peptide reconstitution for research, covering solvent choice, calculations, and storage.
Are Peptides Legal in Australia? A 2026 Research Guide
A clear overview of how research peptides are classified in Australia and what that means for laboratory and research use.