Certificates of Analysis (COA), explained
What a Certificate of Analysis reports, and why batch-specific documentation matters for research.
What is a Certificate of Analysis?
A Certificate of Analysis (COA) is a laboratory document that reports the results of analytical testing performed on a specific product or batch. For research peptides, a COA is the documentation researchers use to verify what a material is and how pure it is.
What a COA typically reports
- Product identity — the compound the material was tested as.
- Batch or lot number — links the document to a specific production lot.
- Reported purity — the measured purity, usually as a percentage.
- Testing date — when the analysis was performed.
- Analytical method — such as HPLC or mass spectrometry.
- Supporting data — chromatograms or spectra, when included.
Why batch-specific matters
A COA is only meaningful if its batch or lot number matches the material you receive. A generic report that is not tied to a specific batch provides far less traceability. Always confirm the batch number on the vial corresponds to the COA.
Frequently asked
Is a COA a guarantee of safety?
No. A COA reports analytical results for research reference. TagPep products are for laboratory research use only and are not for human or veterinary use.
Can I request a COA?
Available COAs may be shown with the product or provided on request, depending on the product and batch.
Looking for research compounds?
Browse TagPep's catalog of research peptides and laboratory compounds, supplied with available batch documentation for laboratory research use only.
Browse research compoundsEducational content for research reference only — not medical, veterinary, or personal-use advice. Products referenced are research compounds supplied for laboratory research use only and are not intended for human or veterinary use.