- A Janoshik PDF is just a file. The report that counts is the one on the lab's own verification page, reached by the key printed on it. Anything that does not resolve there is not a Janoshik report.
- The commonest fraud is not a forgery. It is a genuine report, for a genuine sample, that belongs to a different client, a different batch, or a year ago — and is presented as if it were yours.
- Five fields settle it: the key resolves, the client name is the vendor you are buying from, the batch on the report matches the carton, the date is recent, and the numbers on the vendor's page match the lab's page.
- After the lab's reported data exposure in early 2026, formatting and task numbers can be copied convincingly. Only the verification page is proof.
A buyer on a peptide forum posts three screenshots. Three vendors, three "independent Janoshik reports" for the same compound, and the purity figure is identical on all three: same percentage, same decimal places, same measured content. How, they ask, is that possible? It is possible because two of the three did not test anything. This article is about how that happens, how to see it, and how to make a report earn your trust in about five minutes.
What a genuine report is, and what a PDF is
Janoshik Analytical is an independent laboratory in the Czech Republic. When it tests a sample it issues a report carrying a task number and a verification key, and it publishes the report on its own website, where the key retrieves it. The verification page is the report. The PDF the vendor emails you, or the image on their product page, is a copy of it, and a copy can be altered, borrowed, or invented.
That distinction is the whole method. Every check below comes back to one question: does the lab's own site say what the vendor's page says?
The five ways a report goes wrong
1. The borrowed report. The report is real. It verifies. It just is not the vendor's. Peptide is often bought from a manufacturer or a wholesaler who tested their own batch; a reseller copies that report onto their site. The tell is the client field: the lab records who submitted the sample. If the client named on the verification page is a manufacturer or a different company, the vendor did not test their stock. They are showing you someone else's homework.
2. The stale report. Real, verifies, and the vendor's own. It is also from a batch sold out eighteen months ago. Each production batch is a separate synthesis, and a report describes one of them. A report with no batch number, or a batch that is not the one on your carton, tells you about a product you did not buy. This is why batch traceability matters more than the report itself.
3. The edited PDF. Real report, real key, and a purity figure that has been retyped from 91% to 99% in a PDF editor. The verification page will show the original number. The vendor is betting you will not look.
4. The fabrication. A report that never existed. A layout copied from a real one, a task number that looks plausible, a key that resolves to nothing or to a different compound. The give-aways are round numbers ("100.00%"), a missing key, or a key that does not resolve.
5. The wrong test. Real, verifies, correct client, correct batch — and it is an identity-only test, or a purity test with no quantity, presented as if it were the full panel. Read which fields a report contains and check the ones that matter for the question you are asking.
Why this got harder in 2026
In February 2026 Janoshik was reported to have suffered a data exposure affecting customer order records and report metadata. The lab's account, as relayed in the community, was that systems were restored within a day and no payment data was taken. The point for a buyer is narrower: task numbers, client names, batch references and report formatting from real orders may be in circulation, which makes a fabricated report easier to make convincing on its face. It does not touch the verification page, which still reflects the measurement the lab made. It simply means that "it looks like a Janoshik report" has stopped being evidence of anything, if it ever was.
The five-minute check
Take the report the vendor shows and do these in order. Stop at the first failure.
- Find the key and verify it. A verification key is printed on every genuine report. Enter it on the lab's verification page. No key, or a key that does not resolve: stop.
- Read the client field on the lab's page. It should name the vendor you are buying from. If it names a manufacturer, a wholesaler or a brand you have never heard of, the report is borrowed.
- Match the batch. The lab's page names the batch that was tested. It should match the batch on the vendor's product page and, when the parcel arrives, the batch on the carton.
- Check the date. A report is for one batch. If the vendor has been selling for a year and shows one report, ask which batch you are receiving and whether it has its own.
- Compare the numbers. Purity, and the measured content in mg or mg/ml. The vendor's page should quote the lab's figures exactly. A page that says "99%" when the lab says 97.4% has been rounded in the vendor's favour, and that tells you how they round everything else.
If all five pass, you have a report that describes a sample the vendor submitted, from the batch you are buying, recently, and honestly transcribed. That is as much as any report can prove; the four things it still does not cover are a separate question.
How Biovanta's reports are published
Each batch we sell is submitted to Janoshik as it comes on sale, in Biovanta's name, and the result is published on the testing page with the task number, the batch, the measured figures and the verification key, next to the manufacturer's own certificate. The batch printed on your carton is the batch on the report. Where a batch's independent report has not come back, the product page says so rather than showing an older one. Products are supplied strictly for in-vitro laboratory research.
Sources
Questions this article answers
How do I verify a Janoshik report?
Take the verification key printed on the report and enter it on Janoshik's own verification page. The lab's site shows the genuine report: client, batch, date and figures. If the key does not resolve, the document is not a Janoshik report, whatever it looks like.
Why do several vendors show the same Janoshik report?
Because they bought from the same manufacturer or wholesaler and copied that supplier's report. The report is real but describes the supplier's sample, not the reseller's stock. The client field on the verification page reveals who actually submitted it.
A report verifies but the batch is different from my carton. Does it still count?
It counts for the batch it names, not for yours. Each batch is a separate synthesis. Ask the vendor for the report on the batch you are receiving; a vendor who tests per batch will have it.
Can a fake report pass verification?
No. Verification retrieves the report from the laboratory's own records, which a vendor cannot edit. What can pass is a genuine report presented misleadingly — wrong client, wrong batch, wrong date — which is why the check does not stop at 'it resolves'.
Want the certificate for a real batch?
Name a compound and we'll send the manufacturer's HPLC-MS certificate for the batch you would receive — before you order, no account needed.