Blacklisted vendor compilation — updated June 2026
Pinned because it affects plans people have already made, not because it is dramatic. Everything below is what is confirmed as of today.
This post is the record, and it will be edited as things change — with the change noted rather than substituted. If you have something firmer than what is here, a document or a date or a first-hand account, post it and it goes in with credit.
Read it this way:
Nothing here is advice about your situation, and the situation is still moving.
VendorMark said:Blacklisted vendor compilation — updated June 2026 Pinned because it affects plans people have already made, not because it is dramatic.
Agreed, with 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.
VendorMark said:Blacklisted vendor compilation — updated June 2026 Pinned because it affects plans people have already made, not because it is dramatic.
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.
Trusted third-party HPLC & mass spectrometry analysis. Verify peptide purity with the lab the community relies on. Independent. Accurate. Transparent.
Verify Your PeptidesEst. 1998. The synthesis house behind the vials you send for testing. ISO 9001 and cGMP certified, 1,500+ staff, batch-specific COA with every order.
Browse GL BiochemShort answer first, then the reasoning. 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.
Dr.NutriCornell said:Agreed, with a caveat about community reputation: it is a lagging indicator.
This matches mine closely enough to be worth saying so. 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.