[VERIFIED] Vendor application thread — apply here
This list is maintained by the moderation team and it records one thing only: which suppliers members have independently tested, and how consistently the results held. It is a record, not a recommendation.
On the list
| Supplier | Mean purity | Independent tests on file | Standing |
|---|---|---|---|
| QSC (Qingdao Sigma Chemical) | 97.3% | 56 · Janoshik | Listed |
| WWB (Wuhan Wansheng Bio) | 96.5% | 7 · Janoshik | Listed |
| GGPeps (Nantong Guangyuan) | 96.8% | 11 · Janoshik and PeptideDetective | Listed |
What being listed does and does not mean
- Does mean: more than one member has paid for a test, on more than one batch, over months, and posted the report.
- Does mean: no unresolved scam report and no unanswered quality complaint at the time of review.
- Does not mean that the batch in your hand is the batch that was tested. It is not, and nobody can tell you otherwise.
- Does not mean endorsement. This board sells nothing, brokers nothing, and takes nothing from anyone on this list.
A supplier comes off the list the moment a quality question goes unanswered, and a removal is recorded rather than quietly done. If you have a test result — good or bad — post it in the review sections and it will be counted.
Reviewed monthly.
mike_mod said:[VERIFIED] Vendor application thread — apply here This list is maintained by the moderation team and it records one thing only: which suppliers…
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.
If somebody has the primary source to hand I would rather cite it than paraphrase it.
mike_mod said:[VERIFIED] Vendor application thread — apply here This list is maintained by the moderation team and it records one thing only: which suppliers…
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.
Janoshik Analytical — Independent Testing
Trusted third-party HPLC & mass spectrometry analysis. Verify peptide purity with the lab the community relies on. Independent. Accurate. Transparent.
Verify Your PeptidesGL Biochem (Shanghai) Ltd. — Direct Manufacturer
Est. 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 BiochemAnswering 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.
Dr.NutriCornell said:Agreed, with a caveat about community reputation: it is a lagging indicator.
Can confirm the pattern Dr.NutriCornell describes. 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.