What is a COA?
The Certificate of Analysis (COA) is the document issued by an independent laboratory after testing a sample from a peptide batch. It is the single most important piece of evidence for verifying that a product truly is what it claims to be.
The key information to check
1. The batch number
It must match exactly the one printed on the label of the vial you received. If the numbers don't match, the COA proves nothing about your specific vial.
2. The HPLC purity level
Expressed as a percentage, it indicates the proportion of the main compound in the tested sample, measured by high-performance liquid chromatography. A serious research peptide typically shows a purity of ≥98%. A lower level isn't necessarily dangerous, but it should be consistent with the price and the seller's claims.
3. Mass confirmation (LC-MS)
Mass spectrometry coupled with liquid chromatography (LC-MS) confirms that the molecule present truly has the expected molecular mass for the stated peptide — an identity check, in addition to purity.
4. The analysis date and laboratory
A recent COA, issued by an identifiable, independent laboratory (not affiliated with the seller), is a mark of seriousness. BioPep works with Janoshik Analytical for all of its batches.
What a COA does not guarantee
A COA attests to the chemical composition of the batch tested at the time of testing. It does not replace good storage practices after receipt (see our preparation and storage guide), which remain the buyer's responsibility.
How to get a COA from BioPep
The batch number printed on your vial lets you request the corresponding COA. Contact us with this reference.