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.
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.
What I am after is how people are distinguishing a supplier having a bad batch from a supplier on the way out.
If the honest answer is that nobody knows, that is a useful answer and I would rather have it.
Short answer first, then the reasoning. 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.
Dr.PeteFamMed said:Prices dramatically below market are the strongest single signal, and the reason is arithmetic rather than suspicion.
Right, and one flattering data point from a group buy is not consistency. Consistency means separate batches, separately commissioned, over months.
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Browse GL BiochemLindaRN_retired 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…
This matches mine closely enough to be worth saying so. The pattern that distinguishes a bad batch from an exit is behaviour rather than product. A bad batch comes with communication, a reshipment offer and a batch number. An exit comes with slower replies, pressure toward less reversible payment methods, sudden discounting, and the same reassurance repeated without any new information. The product tells you less than the correspondence does.
Adding the clinical framing, because it changes how the question reads.
Shipping damage protocol for vendor vetting orders: if your package arrives with visible damage, temperature excursion, or broken vials:
Reputable vendors will replace damaged shipments without argument. If they push back, that's a red flag about the vendor.