Six orders from the same supplier over eight months, every one independently tested, and the consistency is the part worth reporting rather than any single result.
Writing it up rather than posting a verdict, because a verdict is not checkable and the detail is.
Red flags, in rough order of how much they should worry you: no verifiable address, no batch numbers, prices far under market, vendor-commissioned tests only, pressure toward irreversible payment, and shipping with no temperature control.
A caveat about community reputation: it is a lagging indicator. Reports arrive weeks after orders, so a supplier can look excellent for a month after quality has already changed.
The narrow version of the question is how people are distinguishing a supplier having a bad batch from a supplier on the way out. I have searched first, so if this is covered somewhere point me at it and I will read it.
COA_Karl said:Six orders from the same supplier over eight months, every one independently tested, and the consistency is the part worth reporting rather than any…
That is correct as far as it goes, and here is where it stops going. The useful checklist is about verifiability rather than presentation. Independent test results commissioned by buyers rather than by the seller, consistency across multiple batches over time rather than one flattering report, a physical address and a company registration that resolve, batch and lot numbers on the actual labelling, and a shipping practice that matches what the material needs. Everything a good-looking website provides is cheap to fake; none of the items above are.
COA_Karl said:Six orders from the same supplier over eight months, every one independently tested, and the consistency is the part worth reporting rather than any…
I disagree that testing history is decisive. It tells you what a supplier did when they were being watched. Continuity of behaviour under stress — a late shipment, a failed test, a complaint — is more predictive than any run of good results.
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View ResultsAnswering the narrow version, because the broad one does not have a single answer. Prices dramatically below market are the strongest single signal, and the reason is arithmetic rather than suspicion. Synthesis, testing, and cold-chain shipping have floors. A price well under the floor means something was skipped, and the two things that get skipped are testing and content.
LipidDoc_ATL said:The useful checklist is about verifiability rather than presentation.
Adding a me-too, because a thread of one person's experience is not much use. I had assumed I was the exception until I read this.