A certificate is the document a supplier offers as evidence of what is in the vial. Most of what circulates in this market does not do the job it appears to do, and the reasons are consistent enough to check in about a minute.

Why the lot number is the whole document

A certificate of analysis is only worth anything if the lot number on it matches the lot on the vial in your hand. A certificate from a different batch, or one with no lot number at all, tells you nothing about what you received — and re-publishing another seller's results as though they were ours would be worse than publishing none.

What to ask any supplier, including us

• Does the certificate name a specific lot, and does that lot match the vial?
• Is the laboratory named, and can you verify the result with them directly rather than from a PDF the seller sent you?
• Does it cover identity as well as purity? Purity testing alone cannot tell you the vial contains the compound on the label.
• Is the certificate free, or charged as an extra?

Where we stand

Our supplier has had samples of many lines tested by Janoshik, and those product pages give the task number and key so you can open the report at janoshik.com/verify yourself. By the standard above, treat them for what they are: evidence about the sample the supplier submitted, not about your lot. We copy no purity figure from them onto our pages and charge nothing for them. Lines with no test yet say Coming soon.