A purity number is a measurement under stated conditions, not a property of the molecule. What the gradient, the wavelength and the integration window each contribute, and where a supplier can quietly inflate a figure.

What the number means

Every figure Pure Labs publishes is tied to a method, a lot and a date. This note explains how to read it, and what it does not tell you. Nothing here is guidance on use.

How we apply it

Certificates for every lot are public in the lab results library. If a printed figure and a certificate disagree, the lot is withdrawn.