What a certificate of analysis is
A certificate of analysis is the record of what an analytical laboratory measured on one specific lot of material. It is not a brochure and it is not a specification sheet. A real one is boring, specific and dated, and it names a batch.
A certificate for a peptide lot should carry, at minimum:
- The compound name and the lot number. The lot number is the whole point — it is what ties the document to a physical batch.
- The release specification the lot was tested against. Ours is >99% (HPLC).
- The measured purity, and the method it was measured by.
- An identity result — the observed mass against the theoretical mass for the declared sequence.
- Appearance, fill and date of analysis.
How to check yours in ten seconds
- Read the lot number printed on the vial label.
- Find that lot number on the card above, or on the certificate that came with the parcel.
- Confirm they are the same string — not similar, the same.
- Confirm the compound and the fill on the certificate match the vial.
- Open the laboratory’s verify link and confirm the report ID resolves there. That step does not involve us at all, which is the point of it.
If the two lot numbers do not match, what you have is a representative certificate: a genuine document, from a genuine assay, of a batch that is not yours. That is the standard practice across much of this category and it is the practice this page exists to argue against.
Specification is not measurement
A product tile on this site prints >99% (HPLC)and labels it as the release specification — the bar a lot has to clear before it is sold. The measured figure for a particular lot is on the certificate, and where one exists the tile carries it as a separate badge with the lot number beside it. Those are two different numbers describing two different things, and a supplier that prints a measured figure as though it were a specification is advertising a result from somebody else’s vial. More on the distinction in testing methodology.
Why these are pictures and not PDFs
Each certificate above is served as an image of the document rather than the document itself. A COA in editable form is the single most forgeable asset a supplier in this category publishes: change the laboratory’s name and the purity figure and you have a convincing forgery carrying a real accredited lab’s letterhead. Publishing the source file hands that to anyone who wants it. The verify link on each card is the better check anyway — it confirms the report against the laboratory that issued it.
What a certificate does not tell you
A UV-area purity figure measures the proportion of UV-absorbing material in the sample. Residual water, counter-ions from purification and residual solvent do not absorb and therefore do not appear as peaks, which means peptide content by weight is almost always lower than the purity percentage implies. Every certificate above states its net peptide content separately for that reason. This is true of every certificate in this category, not only ours, and it is worth knowing before comparing two suppliers on a decimal place.
A certificate for a lot that is not listed
Email [email protected] with the lot number from the vial and we will send the certificate for that batch. If you are evaluating us before ordering and want to see what a certificate looks like first, every one above is the full document.
