Take this with you.

Seven red flags that should make you close the tab, six green flags that mean he might not be a complete disaster, and the three ways suppliers game COAs so the lab report is real but what's in your vial isn't. The part most people skip.

It also walks you through how to actually read a COA once you have one in front of you — lab name, batch number, HPLC purity, endotoxin levels, verification keys — and the one right-click trick that tells you whether the PDF came from a lab or from Canva.