Reading a REVIVE Certificate of Analysis

It describes one batch and nothing else

A certificate applies to the batch it was issued for. Two batches of the same compound, made the same way, have their own certificates and small differences between them are normal. A certificate presented without a matching batch number tells you nothing about the vial in front of you.

So the first check is not the purity figure. It is whether the batch number on the certificate matches the vial and the box.

Purity, and the method beneath it

Chromatographic purity is the target peak area as a percentage of total peak area, produced under a specific method. Column, gradient and detection wavelength all shape it — a shallower gradient resolves closely related impurities that a steeper one merges into one peak, and reports a lower, more honest number.

A purity percentage quoted without its method cannot be compared with another supplier's.

Purity is not content

Purity asks what fraction of the peptide-related material is the target. It does not say how much of the powder is peptide at all. Lyophilized solids also contain counter-ions and residual water, so a vial can be 99% pure while a meaningful part of its mass is not peptide.

That is a separate measurement, and anyone calculating a concentration from the vial's stated mass is relying on it.

Dates assume storage

An expiry date describes material kept as the certificate specifies. A vial that spent a month at room temperature has aged faster than the calendar suggests, and the printed date has no way of knowing.