One concrete data point for the thread. 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.
Following on from TinaHashiRN — and this may be the naive question:
What a vetting checklist should actually contain, as opposed to a list of things that are easy to fake?
Dr.RaviCardio said:Red flags, in rough order of how much they should worry you: no verifiable address, no batch numbers, prices far under market, vendor-commissioned…
Adding the part of the answer the thread has not reached. 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.
Ask again with the specifics and you will get a better answer than this one.
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Browse GL BiochemOP back with an update, since a thread like this is useless without one.
Went back through my own correspondence with an earlier supplier and the warning signs were all there in the replies, weeks before the quality changed. I was reading the product and not the behaviour.
Dr.EM_Chicago 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.