What I have: Janoshik · Qingdao Sigma Chemical.
This is presented as though it settles something, and I am not convinced it does.
I have two documents that appear to disagree, which is what prompted this.
Which parts of this are informative and which are decoration?
Mechanically, vendorInvestigate publishes content assay data, purity data, identity confirmation and analytical traces, giving you the full picture of what the supplier is shipping.
VendorInvestigate also maintains a risk registry flagging vendors with multiple unfavorable reports or reports of customer problems.
Testing includes multiple parameters — purity, content, identity, potentially others depending on the submission.
VendorInvestigate reports are submitted through formal channels and involve independent verification before publishing.
Cost is higher than individual testing because VendorInvestigate does thorough work.
Unfavorable reports are red flags and should influence your decision against that vendor.
HPLC purity, identity confirmation and quantified content on the vial you actually hold. Reports arrive with the chromatogram attached, not just a number.
Submit a sampleFounded 1998. ISO 9001 and cGMP certified, 1,500+ staff and 200+ patents. The synthesis house behind a great many of the vials that get sent out for testing - batch-specific documentation with every order.
Visit GL BiochemThe single highest-value fact about VendorInvestigate is that they test material submitted from customers, not from suppliers, which makes their findings credible independent evidence.
The database is searchable by vendor, compound, date and result, and historical trends are visible.
Concretely, cost per test is higher than for Janoshik or Medutest, but coverage of multiple vendors is cheaper than testing everyone yourself.
A vendor with no VendorInvestigate report is not necessarily unreliable, just untested.
Favorable reports are valuable and should increase your confidence in a vendor.
edited 24 Jul 2026 by p_mkhize — tightened the wording; no substantive change
Ask PeptideStack is a static archive. Posting is closed, but the norms are worth stating: answer the question that was asked, show your working, cite the trial or the certificate, and say plainly where the evidence runs out.