Janoshik Test Reports Explained: What They Show and Do Not

Peptilyze does not endorse, certify or rate any laboratory or any shop. This article explains what a “Janoshik tested” label refers to. It has one large limit: we could not open the lab’s own website. Both janoshik.com and verify.janoshik.com returned HTTP 403 (access forbidden) to our fetch tool on 2026-11-09, and we did not try to work around the block. What follows comes from a Czech press profile, which quotes the lab’s owner, and from two third-party web pages, each named as such. Where a figure is the owner’s own, we say so, and none of it is confirmed against the lab’s own text.

Key points

• A February 2026 profile in the Czech business magazine CzechCrunch, based on an interview with the owner, describes a commercial analytical laboratory near Prague that handles more than 5,000 samples a month and accepts samples from anyone, anonymously [6].
• The lab tests material sent by users and, according to its owner, by manufacturers and distributors. It does not sell the products it tests [6].
• A third-party directory lists HPLC purity, LC-MS/MS identity, endotoxin, heavy-metal, sterility and residual-solvent tests among its services [1].
• According to a how-to article, a report can be looked up with a six-digit task number and a 12-character key from its footer. The article says this proves a test was recorded, not whose vial it covers [2].
• We could not confirm any accreditation. The directory page says “Not ISO 17025 accredited” [1]; the press profile does not mention accreditation [6]; other pages claim the opposite and we did not open them.
• A report describes tested properties of one sample. It makes no safety claim.

What is Janoshik?

“Janoshik” is the pseudonym of the lab’s founder, Peter Magic, who according to CzechCrunch built his reputation on forums about anabolic steroids from 2011 and later moved into peptide testing; the lab operated in the Czech Republic under the company name Anachrom from 2018 and earlier in Slovakia, the owner told the magazine [6]. The same profile reports, citing the owner, a laboratory in Mníšek pod Brdy near Prague with 25 employees, more than 5,000 samples a month and annual revenue of about 250 million Czech crowns [6]. These are the owner’s figures as reported by a journalist; we could not check them. A directory page places the lab in Prague instead, and describes it as an “independent peptide testing laboratory” [1]; sources differ on the location, and we do not resolve it.

The magazine describes the lab as a commercial analytical service, not a seller: it examines samples that clients bought and want checked, and the operation is subject to regular inspections by state authorities, with extensive documentation for each sample [6]. The article does not say whether the lab holds an accreditation. Per the directory, services are HPLC purity, LC-MS/MS identity, endotoxin (LAL) for injectable samples, heavy metals by ICP-MS, sterility (TAMC and TYMC) and residual solvents by GC-MS, with a standard turnaround of 1 to 8 days [1]. The directory carries a “Last Verified” date of 2026-02-09 and does not state its relationship to the lab or to the shops it lists [1].

Other pages in our search results gave a founding year and a company registration date. We did not open them, so we do not repeat those details.

What does the lab test, and for whom?

According to the owner, quoted by CzechCrunch, the most common test is the active substance and its purity, and the most frequently tested products are GLP-1 drugs, followed by unapproved growth hormones and peptides marketed for healing or regeneration [6]. He says that most samples come from customers in English-speaking countries, up to 75% of his clients, and that some come from manufacturers or distributors, mostly in China, who often use outside analysis because customers find it more credible [6]. As an example of what such testing can find, he describes catching a mix-up between a semaglutide pen and an insulin pen [6]. These are self-reported accounts, not audited figures.

For a reader this matters in two ways. A report is commissioned by whoever pays, and that can be a seller, a producer or an individual. And a “Janoshik tested” line on a vendor page tells you that someone sent a sample, not who and not from which batch.

What does a Janoshik report show?

Each test type is a separate report, according to an October 2026 how-to article, and a report carries these fields [2]:

• Task number, six digits, printed at the top.
• Two dates: testing ordered and sample received.
• Client, sample, manufacturer and batch, which the article says are typed by the customer and not checked by the lab [2].
• Tests requested, such as a purity analysis or an endotoxin test.
• Results: amount in mg per vial, purity, or endotoxin in EU per vial.
• A 12-character unique key in the footer, and a QR code [2].

The article says the identifying fields are typed by the client, so the same words appear on a report whether or not they match the vial you hold [2]. The article’s publisher states it is not affiliated with the lab, and the page carries commercial links to sellers [2]; its procedural statements are secondhand.

Our general explanation of what these quantities mean is in what a peptide CoA proves and does not: an HPLC purity percentage is a share of detected signal, and the amount of peptide per vial is a different measurement [5].

How do I verify a Janoshik report?

We could not open the lab’s verification page, so we cannot tell you what it says. The how-to article describes this procedure: go to the lab’s verification page (typing the address yourself rather than following a seller’s link), enter the task number and the 12-character key in capitals, and a valid pair returns a green confirmation while a wrong pair returns a red error [2]. It then says to open the stored report and compare every field with your copy [2]. We did not test any of this.

The same article states the main limit: a valid key shows that a test was recorded, not that it covers your product [2]. Because the client types the batch and manufacturer fields, and the lab accepts samples from anyone [2][6], a matching key and a matching result do not by themselves show that the product in your hands was the one tested.

Is Janoshik accredited?

Not verified. The directory page lists “Not ISO 17025 accredited” under its drawbacks [1]. The press profile mentions regular inspections by state authorities but not accreditation [6]. Other pages in our search results claimed accreditation with a certificate number from the Czech Accreditation Institute; they included seller pages, and we did not open them. We could not read the lab’s own statement.

We tried to check. The Czech Accreditation Institute publishes an accredited-bodies database with a search field and, on the day we opened it, 1,104 records, but only the first page of entries loaded for us, so we cannot say whether the lab is listed [3]. A search of the Institute’s published certificates for the company name also returned nothing for it, which is not evidence either way, because we could not search the register itself. The ILAC signatory search is the route to find a national accreditation body and, for some bodies, a link to its directory of accredited facilities [4]. Result: we could not confirm accreditation either way. To check yourself, search the Czech database by name and read the scope of any entry, because accreditation covers defined methods, not everything a lab does [3][4].

Who pays for tests?

We could not read the lab’s own text. According to the owner, anyone can send a sample anonymously and pay in ordinary money or cryptocurrency, and manufacturers and distributors also send material [6]. The how-to article treats reports as ordered by a client, whose details the client types in [2]. The directory lists a +100% surcharge for expedited service but no price list [1]. Whoever pays also chooses what is sent, which is the main limit below.

Risks and unknowns: limits of any seller-commissioned report

These limits apply to any lab, and to this one.

1. The sender picks the sample. A report describes the material submitted, and the lab, according to the how-to article, does not check the client, manufacturer or batch fields [2].
2. One batch. A report covers one batch at one date. It does not show that a later batch matches. Our checklist suggests asking whether every batch is tested [5].
3. Not every property. Purity and content are separate quantities, and endotoxin, sterility and metals are separate tests [5]. The directory lists endotoxin, sterility and heavy-metal testing among the services [1], so whether a given report includes them depends on which tests were requested, as the how-to article says each test type is a separate report [2]. The owner says the most common request is the active substance and its purity [6].
4. Everything about the lab itself is secondhand. Sizes, volumes and revenue are the owner’s figures as reported by a journalist [6], and other pages about the lab come from sources with commercial ties to sellers [1][2]. We found no independent audit.

Does a Janoshik report mean a peptide is safe?

No. A report describes tested properties of one sample on one date. It is not a safety assessment, and neither this article nor Peptilyze draws that conclusion. Whether any given peptide product is legal to sell or possess depends on the country; see are peptides legal.

How to check any report you are shown

These steps concern the document, not the vial, and follow our CoA reading guide [5].

• Does the batch number match the one on the product or order?
• Is the test date recent and consistent with the batch?
• Is the lab named, and can its own verification route confirm the report? Type the address yourself.
• Which tests were run (purity, identity, amount, endotoxin, others)? A listed test is not the same as one that was done.
• Is the raw chromatogram or spectrum shown, or only a summary line?
• Does the same report, with identical results, appear under other names?

If you compare products by price, the purity-adjusted price tool and peptide mass calculator work from numbers you enter; they do not check a report. Shops that publish reports are collected at /lab-tests/, as published by the shops and not checked by us [5].

Frequently asked questions

What is Janoshik? The pseudonym of the founder of a commercial testing laboratory used by sellers and individuals to test peptides and other products. A Czech business magazine describes it as a service near Prague with 25 employees, based on its owner’s figures [6]; a directory lists HPLC purity, LC-MS/MS identity, endotoxin, heavy-metal, sterility and residual-solvent tests [1]. We could not open the lab’s own website to confirm this.

What does a Janoshik report show? According to a how-to article: task number, two dates, client, sample, manufacturer and batch fields typed by the customer, the tests requested, results and a 12-character key [2].

How do I verify a Janoshik report? The same article describes entering the task number and key on the lab’s verification page, and says a valid pair shows a test was recorded, not whose vial was tested [2]. We could not open that page.

Is Janoshik accredited? Not verified. A directory says it is not ISO 17025 accredited [1], the press profile does not mention accreditation [6], and we could not find or rule out an entry in the Czech database [3].

Does a Janoshik report mean a peptide is safe? No. A report describes tested properties of one sample and makes no safety claim.

Sources

1. PeptideProtocolWiki, “Janoshik Analytical” lab directory page (last verified 2026-02-09). https://www.peptideprotocolwiki.com/labs/janoshik-analytical (third-party; read 2026-11-09; supported services, turnaround, “Not ISO 17025 accredited”)
2. PeptideDeck, “How to verify a Janoshik report” (2026-10-30). https://www.peptidedeck.com/blog/how-to-verify-janoshik-report (third-party, commercial links on the page; supported verification steps and report fields)
3. Czech Accreditation Institute, “Accredited bodies database”. https://www.cai.cz/en/?page_id=4499 (read 2026-11-09; first page of 1,104 records only)
4. ILAC, “ILAC MRA Signatory Search”. https://ilac.org/signatory-search/ (read 2026-11-09; search interface only)
5. Peptilyze, “Peptide Certificate of Analysis: What It Proves and Does Not” (2026-11-09) and “Reading a certificate of analysis” guide. https://peptilyze.com/articles/peptide-coa-what-it-proves-and-what-it-does-not/
6. Karolina Tremko, CzechCrunch, “Svět šílí po peptidech, propadli jim i miliardáři ze Silicon Valley. Přípravky testuje laboratoř z Prahy” (published 2026-02-09, updated 2026-02-16; in Czech). https://cc.cz/svet-sili-po-peptidech-propadli-jim-i-miliardari-ze-silicon-valley-pripravky-testuje-laborator-z-prahy/ (read 2026-11-09; owner interview: location, size, history, clients, what is tested; the article’s other statements about the lab are the journalist’s)

Not verified and not cited as fact: janoshik.com and verify.janoshik.com (HTTP 403); lab-directory pages, vendor blogs and a catalogue mirror (labrulez.com, 403) that appeared in search results, including those claiming a founding year, company registration date or an accreditation certificate number.

This article is information, not medical advice.