Janoshik Analytical draws around 18,000 US searches a month according to keyword-volume tooling, and almost everyone searching has arrived at the same place: a vendor's product page showing a certificate with the Janoshik letterhead, and no way to tell whether it means anything. Janoshik does not sell peptides. It is a contract testing laboratory in the Czech Republic that analyses samples for whoever pays for the analysis — vendors, resellers, and individual buyers who ship a vial in themselves.
That distinction does most of the work on this page. A Janoshik report is evidence about one sample, commissioned by someone with a commercial interest in the result, and published by that same someone. What makes it unusually useful anyway is that Janoshik runs a public database of every report it issues, so a certificate can be checked against the lab's own copy in about thirty seconds. Below: where the lab is, what it charges, which vendors we could actually confirm use it, how the verification step works, and what a clean report still cannot tell anyone.
Research-context information only. Compounds discussed are research peptides; some are investigational drugs not approved by the FDA. This article reports what has been documented, not what should be done. Possession or use of investigational drugs outside an authorized clinical trial may be illegal in your jurisdiction. Consult a licensed physician for personal medical decisions.
Which country is Janoshik from?
The Czech Republic. The operating company is Janoshik s.r.o., registered in the Czech commercial register under company ID 17668727 with a registered office at Kaprova 42/14, Prague 1, and an incorporation date of 25 October 2022. Its registered activities include technical testing and analysis. The lab's own terms name the Municipal Court in Prague as the registering court and Czech law as the governing law. The price list corroborates it from the other direction: every test is quoted in US dollars with a Czech koruna figure beside it — a BPC-157 analysis shows as $215.00 and 4 710,65 CZK.
One detail worth separating out: the registered office is not the laboratory. Janoshik publishes no laboratory address, city or even country anywhere on its site, and its terms state that the address for sending samples is disclosed only after payment. The company's registration is verifiable in a state register; the bench is not.
Janoshik also states that it accepts samples globally. So the country of the laboratory and the country of the vendor are routinely different, and a European lab report on a US vendor's product page is the normal case rather than a discrepancy.
One practical consequence: the lab's EU location means it sits outside FDA jurisdiction entirely. A Janoshik certificate is not a regulatory document in the United States, and it has never been presented as one.
Is Janoshik a legit lab?
It is a real, operating laboratory, and — unusually for this market — that is checkable rather than merely asserted.
We verified the verification system directly. Entering the task number and unique key from a published vendor certificate at janoshik.com/verification returned, verbatim: "This test is in our database. You can open the report and check if the data match your report." Changing a single character in the key returned, verbatim: "No test found for the given task number and unique key." The database is public, it responds, and it discriminates between a real report and an invented one.
That is a meaningful amount more than most certificates in this market offer. It is also not the same as three other things that get bundled into the word "legit":
- Accreditation. Janoshik does not claim ISO 17025 accreditation, and we found no published record of it. The words "accredited" and "17025" appear nowhere on the lab's site or in its terms. What it does publish is a receipt letter from ÚSKVBL, the Czech veterinary medicines regulator, acknowledging a notification about handling substances under the Czech Medicines Act — a registration for importing standards and samples, carrying no test scope. Janoshik's own terms say so directly: regulation of the laboratory, or any of its test reports, does not by itself confer product approval by the regulating body or any other authority. By contrast, Vanguard Laboratory certificates published by two of the vendors we checked carry an explicit ISO 17025:2017 mark and an A2LA certificate reference that can be looked up. Where a vendor claims "ISO-accredited laboratories" site-wide without naming them, that claim is the vendor's, not the lab's.
- Independence of the result. The lab is independent of the vendor, which is the point. But the vendor chooses what to submit, when to submit it, and whether to publish what comes back. Reports carry a
Client:field precisely because someone commissioned them. Janoshik is explicit that it takes no position on the companies whose samples it tests — its public results index carries the line "We do not endorse, sponsor, or have any affiliation with any of the companies, organizations, or products listed." A vendor presenting a Janoshik report as a Janoshik endorsement is contradicting the lab. - Anonymity in the chain. Some published Janoshik reports name the vendor in the client field — EZ Peptides' certificates read
Client: http://ezpeptides.com/. Others do not. Among the Janoshik reports published by Swiss Chems, we opened two: one readClient: IMT, the otherClient: Anonymous, and one listedManufacturer: Unknown. Those reports are genuine Janoshik documents, but nothing inside them ties the tested sample to the vendor publishing it.
How much does Janoshik cost?
Janoshik publishes a per-test price list, which is why the cost question has a straight answer. Figures below were read from the lab's own product pages in November 2026.
| Test | Listed price |
|---|---|
| BPC-157 analysis (identity, amount, purity) | $215 |
| RU-58841 analysis | $215 |
| Armodafinil analysis | $290 |
| Survodutide analysis (investigational compound) | $400 |
| O-304 analysis | $600 |
The contaminant panels that distinguish a thorough certificate from a purity-only one are priced as add-ons on top of the base test:
| Add-on | Listed price |
|---|---|
| Heavy metals analysis | +$105 |
| CHNS mass report | +$145 |
| Endotoxin analysis | +$180 |
| LC-MS screening for peptide contamination | +$205 |
| Sterility testing | +$290 |
| TFA analysis | +$290 |
| Fentanyl presence analysis | +$75 |
| Variance testing | +$75 |
| pH measurement | +$35 |
| Raw data | +$25 |
The stated minimum sample is one whole unopened vial, or 30mg of raw API powder in a sealed glass vial; sterility testing needs two. On timing, the marketing figure and the contractual one are very different numbers: the homepage advertises an average rush turnaround of three hours from sample receipt, while the terms guarantee 21 working days, with sterility listed at 14 days on its own product page. Expedited work is priced at a 100% surcharge.
These figures carry a check date for a reason. Comparing the current catalog against an archived copy from February 2026, prices across the peptide menu rose roughly 15-20% inside nine months — BPC-157 from $180 to $215, the GLP-1 blind test from $300 to $360. Any price quoted for this lab goes stale.
Those numbers explain a pattern that otherwise looks like vendor laziness. A purity-and-identity test on a single batch runs a couple of hundred dollars; adding sterility, endotoxin and heavy metals to the same batch roughly triples it. Multiply by every lot of every SKU and full-panel coverage becomes a real line item — which is why published certificates across this market skew heavily toward purity and identity, with contaminant panels appearing selectively.
What peptide companies use Janoshik?
This is the question with commercial consequences, and it is also the one where the market's assumptions are least reliable. Janoshik's name circulates as a shorthand for "properly tested," and secondary review sites attach it to vendors freely. We checked it against primary documents instead.
Our own vendor data records testing methods and COA access — it has never recorded a laboratory name. So for every vendor currently recommended on this site, we opened the certificates those vendors publish and read the letterhead. The attribution below is as of November 2026, taken from those documents rather than from any secondary source.
| Vendor | Laboratory on its published COAs | Janoshik? |
|---|---|---|
| EZ Peptides | Janoshik Analytical | Yes — certificates name Client: http://ezpeptides.com/ |
| Swiss Chems | Janoshik, Freedom Diagnostics and Vanguard Laboratory | Partly — roughly a third of published reports are Janoshik |
| Nura Peptide | Freedom Diagnostics Testing | No |
| Ion Peptide | Freedom Diagnostics Testing | No |
| Ascension Peptides | Kovera Labs | No |
| Mile High Compounds | Vanguard Laboratory, Kovera Labs, ILS Laboratories, Ethos Analytics, Freedom Diagnostics and Chromate | No |
Four findings worth carrying away.
Janoshik is a minority supplier among the vendors we track, not the default. Two of six publish its reports. The other four publish certificates from US laboratories instead. A vendor that does not use Janoshik is not thereby a worse vendor — it is a vendor that commissioned a different lab.
"Partly" is a real category. Swiss Chems publishes certificates from three different laboratories across its catalog, and Mile High Compounds from six. Describing either as "Janoshik-tested" — or as any single lab's vendor — would be true of some batches and false of others, which is exactly the kind of claim that turns a certificate into marketing.
Laboratories change. Ascension's certificates were issued by MZ Biolabs through early 2026 and by Kovera Labs after it; Ion's earlier reports came from a lab trading as BioRegen before moving to Freedom Diagnostics. A lab name verified once is a snapshot, not a standing fact.
Secondary sources get this wrong. At least one review site asserts Janoshik-verified COAs for Ascension Peptides. No Ascension certificate we opened mentions Janoshik. Another attributes a different lab entirely. The vendor's own published documents are the only source worth reading on this question, and they are usually two clicks from the product page.
How to verify a Janoshik report
The verification step is the genuinely useful part of this page, and it takes under a minute.
1. Find the task number and the unique key. Both are printed on the report. The task number appears near the top (Task Number #226960), the key in the footer, directly under the line "Verify this test at www.janoshik.com/verify/ with the following unique key". Keys are twelve alphanumeric characters — RSCWEMM2K6FN is a real one. Reports also carry a QR code encoding the same lookup.
2. Enter both at the lab's verification page. janoshik.com/verification presents two fields, labelled Task number and Unique key. A valid pair returns the confirmation message and an Open report button. An invalid pair returns "No test found for the given task number and unique key."
A trap here, current as of November 2026: the URL printed on the reports themselves, www.janoshik.com/verify/, does not work — it redirects to a malformed address and is blocked. The working page is /verification, which is also where the site's own Verify menu item points. A report whose printed link fails is not thereby a fake.
3. Open the lab's copy and compare it to the vendor's. This is the step that is routinely skipped and the only one that catches a doctored document. The portal does not validate the PDF in hand — it retrieves Janoshik's own stored version of that report. The check is a field-by-field comparison between the two.
4. Match the batch to the vial. A verified report for a batch that is not the batch on the label documents someone else's material — the lot number on the vial and the lot number on the certificate have to be the same string. This is the step that connects a genuine certificate to an actual shipment, and it is the one no verification portal can do on a reader's behalf.
Some vendors now host the certificate on their own domain rather than linking the lab directly. EZ Peptides, for example, serves the active certificate from testing.ezpeptides.com and exposes the Janoshik task number and key on that page, deep-linking to the original. That arrangement is still verifiable end to end — the identifiers resolve at the lab — but the self-hosted page is a presentation layer, and the lab's copy remains the authority.
How forged and altered certificates get spotted
Certificate forgery is not hypothetical in this market. The Partnership for Safe Medicines reported in August 2026 that a US federal judge had sentenced the owner of a peptide company to 70 months in prison over the sale of research chemicals using forged laboratory certificates to deceive customers. The published research points the same direction from a different angle: De Spiegeleer and colleagues, profiling obestatin obtained from five different manufacturers in 2008, found that one of the products was in reality a totally different peptide, and that two-thirds of the remainder were of insufficient quality for research use. Vanhee and colleagues at a Belgian official medicines control laboratory later published a dedicated LC-MS/MS screening method in 2015 for counterfeit and illegal injectable peptide preparations seized by European agencies, covering 25 compounds.
Against that backdrop, these are the signals that a verification check surfaces:
- The identifiers do not resolve. A report whose task number and key return "No test found" was not issued by Janoshik in that form. This is the single highest-value check and the reason the forgery problem is tractable at all.
- The identifiers resolve but the figures differ. A pattern commonly described in community reporting is not an invented document but a real report with an edited number — the purity figure, the measured milligrams per vial, the sample name or the analysis date altered in the published copy while the lab's stored copy still shows the originals. Only the side-by-side comparison would expose this, which is why the comparison step matters more than the lookup.
- The same key appears on multiple products. One report covers one sample. A key recycled across several SKUs means at most one of them was tested.
- A screenshot or a flattened image instead of the original. Removing the live link and the QR code removes the reader's route to the lab's copy. This is not merely unhelpful — Janoshik's terms require that a report not be reproduced other than in its entirety, including the verification data, so a cropped certificate breaches the lab's own condition for publishing it.
- A report described as updated or re-issued. The terms allow a replacement only for a printing error or a mistake by the lab, and state that a report cannot be altered once issued. The sample is also destroyed shortly after the report is sent, so "they re-tested the same vial later" is not a thing that can happen.
- The batch on the certificate is not the batch on the vial. A perfectly genuine, fully verifiable certificate for a different lot proves nothing about the vial in hand.
- A client field that does not tie back to the vendor.
Client: Anonymouson a report published as a vendor's own testing is not evidence of fraud, but it is not evidence of the vendor's chain of custody either.
Two things that are not forgery signals, and get misread as such. Janoshik runs a separate public index of reports at public.janoshik.com, but listing there is opt-in — a customer chooses whether a report is published. A report missing from that index is not thereby fake; only the verification lookup is dispositive. And the broken /verify/ link printed on the reports, noted above, fails for genuine certificates too.
A broader framing of the same problem appeared in a 2026 narrative review of unregulated peptide use by Hailu and colleagues, which characterised the central concern as consumer experimentation with products of uncertain identity, purity, potency, sterility and safety moving through poorly traceable channels. Verification is the part of that problem an individual buyer can actually act on.