The case in front of me: Janoshik · BCH.
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?
Concretely, vendorInvestigate also publishes findings on problematic vendors, flagging suppliers that consistently deliver below-specification material.
VendorInvestigate accepts customer submissions of material for independent testing, with full anonymity protected.
A vendor can request a re-test if they believe VendorInvestigate made an error, and that dispute process is documented.
VendorInvestigate reports are submitted through formal channels and involve independent verification before publishing.
Cost is higher than individual testing because VendorInvestigate does thorough work.
Check VendorInvestigate before choosing a new supplier.
Analytical standards and reagents with traceable certificates. Every quantitative result you read inherits the accuracy of the standard behind it.
Shop standardsMore usefully, the single highest-value fact about VendorInvestigate is that they test material submitted from customers, not from suppliers, which makes their findings credible independent evidence.
Favorable reports are usually not surprising, but they provide credible confirmation of what the supplier claims.
Put another way, 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.
Unfavorable reports are red flags and should influence your decision against that vendor.
A vendor that has been through VendorInvestigate and published a favorable report has passed external verification, which is stronger than any certificate they supply.
The database is searchable by vendor, compound, date and result, and historical trends are visible.
The part that matters: analytical data are published in full, including HPLC traces, mass spectra and quantitation details.
Coverage is not comprehensive — only vendors that enough people choose to test are in the database.
Favorable reports are valuable and should increase your confidence in a vendor.
The short answer is that VendorInvestigate is expensive because they do thorough testing, but the cost is paid once per supplier rather than per lot.
VendorInvestigate also maintains a risk registry flagging vendors with multiple unfavorable reports or reports of customer problems.
The caveat is that none of this makes a research-grade vial equivalent to a licensed medicine. There is no release testing programme behind it, no pharmacovigilance, and no recourse if it is wrong. Independent testing narrows your uncertainty; it does not eliminate the category difference.
If you only pay for one test, pay for quantified content. Purity is the number everyone quotes and content is the number that changes what you do.
edited 6 May 2025 by laminar_bench — fixed an arithmetic slip in the third paragraph
VendorInvestigate publishes content assay data, purity data, identity confirmation and analytical traces, giving you the full picture of what the supplier is shipping.
Reports are published after testing is complete and verified, ensuring that suppliers cannot suppress unfavorable findings.
The service has been operating long enough that systematic bias in their testing would be apparent.
In practice: ask for the chromatogram, check the method section, check the lot number against the vial, and set your accept threshold before you see the result rather than after.
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.