Understanding Certificates of Analysis

The top of the certificate identifies the testing laboratory, the client who submitted the sample, the sample description as received, the date of analysis and the certificate or report number. Check that the laboratory is independent of the supplier and that the sample description matches your product. A certificate that names a different strength or a different compound is not your certificate, regardless of whose logo is on it.

The batch or lot number ties the certificate to a specific manufacturing run. It must match the reference on your vial exactly. Certificates without a batch number, or with a batch number that does not appear on the product, cannot be linked to what you hold and provide no assurance about it.

The identity section reports the method used to confirm the compound, usually mass spectrometry, with the observed molecular weight alongside the theoretical value. For BPC-157 the theoretical average mass is about 1,419.5 g/mol; an observed mass within the instrument's stated tolerance confirms the sequence. Some certificates also report the retention time against a reference standard as supporting evidence.

The purity result is given as HPLC area-percent, and a good certificate prints the chromatogram and the method parameters next to it: column, mobile phases, gradient, flow rate, detection wavelength. The specification limit (for example ≥ 98%) should be shown so that the result can be read as pass or fail, not just as a number.

Depending on the laboratory and the request, a certificate may include peptide content by weight, water content, counter-ion content (TFA or acetate), appearance, solubility and, where relevant, endotoxin. These are separate analyses from purity and are not implied by it. If a field is absent, the test was not performed.

A certificate describes a sample at the time of testing. It does not confirm how the batch was stored afterwards, that every vial in the batch is identical (though a homogeneous batch should be), or that the material is suitable for any particular use. It is evidence of identity and purity at release, which is exactly what it should be used for.

Every Regent Peptides certificate is issued by Janoshik Analytical and is viewable on their verification site. Search by batch reference on our lab reports page.