No batch number
The COA should connect to the exact lot being sold. Generic product PDFs are weak evidence.
Purity without identity
A percentage alone does not prove the vial contains the claimed compound.
No testing method
“Lab tested” should say how: HPLC, LC-MS, mass spectrometry or another named method.
No testing date
Old or undated results are hard to connect to current inventory.
Supplier-created only
Independent third-party analysis is stronger than a supplier-generated certificate.
Human-use marketing nearby
Dosing or treatment claims around research-use products are a compliance and trust problem.
Best next step
Read COA guideUse the full COA guide
Red flags are the quick screen. The full guide explains the testing terms and what they do not prove.