How to read a Certificate of Analysis (COA)
A COA or laboratory report describes the sample submitted for testing. It does not automatically cover every vial, a later shipment or another product variant. The certificate catalogue links to available reports; compare these with the product page before relying on a result.
- Identify the sample. Compare the product name, presentation, sample identifier and report date. Where a batch reference is given, check it against the supplied material. Ask for clarification if the link cannot be established.
- Read the method. Identify what was measured and whether chromatographic purity, identity or quantity was actually tested. Check the stated units and any method notes.
- Check the scope. A chromatogram is not a sterility result. A mass measurement is not a complete impurity profile. Look for a specific test before making a specific conclusion.
- Retain the evidence. Record the report URL, access date and correspondence confirming sample relevance in your laboratory records.
If no report is published for a product, request the available documentation through MKM BioLabs contact. Absence of a link should not be replaced by an assumption about purity or batch testing.
Examples of documentation scope
- MOTS-C 40 mg has separate COA and heavy metals report links; each document addresses its stated test.
- KLOW80 is a blend, so component identification matters when reading its report.
- Retatrutide product options include 20 mg, 30 mg and 40 mg, while published links identify 20 mg and 30 mg samples. Do not extrapolate to an unreported option.
- The Semaglutide 10 mg link is labelled customer-provided; it does not establish the currently supplied batch.
Sources and further reading
- Hoofnagle et al. (2016): recommendations for peptide standards, quantification, storage and handling for mass spectrometry.
- Agilent: peptide standards and analytical characterisation.
- Hureau et al. (2011): X-ray and solution structures of copper complexes of GHK and DAHK, DOI: 10.1002/chem.201100751.
Editorial review: 11 October 2026. This information supports critical reading of laboratory documentation; it does not certify a product or replace method validation.