How to Read a Certificate of Analysis — And What It Does Not Tell You
Most grey market peptide vendors publish a certificate of analysis alongside their products. It looks official. It reports purity at 98 or 99 per cent. For many buyers, it provides reassurance. It should not.
By UAE Peptide Clinic Research Desk
Most grey market peptide vendors publish a certificate of analysis alongside their products. It looks official. It reports purity at 98 or 99 per cent. For many buyers, it provides reassurance. It should not.
What a COA Actually Measures
A certificate of analysis from a research chemical supplier typically reports the results of High-Performance Liquid Chromatography (HPLC) analysis. HPLC measures peptide purity by area — the proportion of the peak corresponding to the target compound versus other detected species. A reading of 99% means 99% of what the instrument detected was the target peptide. It says nothing about what the instrument did not detect.
What a COA Does Not Measure
Standard HPLC analysis does not test for bacterial endotoxin, residual solvents, heavy metals, mycoplasma, or microbial contamination. It does not verify peptide sequence accuracy. It does not test sterility. It does not confirm concentration in the final vial. A product with a 99% HPLC purity figure can still contain dangerous endotoxin levels, incorrect amino acid sequences, or inadequate active compound per millilitre.
A certificate of analysis is only as trustworthy as the regulatory framework behind the laboratory that issued it.
What Pharmaceutical-Grade Testing Includes
A GMP batch release certificate covers identity (peptide sequence confirmed), potency (concentration verified against specification), sterility (no microbial growth), endotoxin (LAL test result within limits), and physical characteristics (pH, appearance, particulate matter). Each parameter has a defined acceptance criterion. Failing any one of them means the batch does not ship.
When our pharmacy issues a certificate for your prescription, it covers all of the above. You can request the batch documentation for any product we dispense. Book a free consultation at /book.