Search the word "janoshik" and you will find it attached to countless peptide certificates, forum screenshots, and product photos, yet rarely an explanation of what the lab actually is or how to read what it produces. This guide is a neutral, source-checked primer: who Janoshik Analytical is as a registered company, how independent third-party testing of peptides by HPLC and mass spectrometry works, what a Janoshik report contains, and how a researcher can confirm that a certificate is genuine rather than trusting a copied image. The descriptions below reflect the company's own published materials and public registry records; they are not an endorsement, and this piece makes no claim about the lab's accreditation status beyond what those sources state.
Who is Janoshik Analytical?
Janoshik Analytical operates as Janoshik s.r.o., a Czech limited-liability company (spolecnost s rucenim omezenym). Public registry records list its identification number (ICO) as 17668727 and its registered address as Kaprova 42/14, Stare Mesto, 11000 Praha (Prague), Czech Republic, with a registry publication dated 25 October 2022 (North Data company record).
On its own About page, the company describes itself as "an independent testing laboratory offering reliable and verifiable analytical services" and states "over 10 years of experience with chemical analysis of PEDs and related compounds." Its published leadership team is named as Peter Magic (Owner and CEO), Edita Prokesova (CSO), and Jakub Dobrik (Managing Director and CFO).
The lab positions its scope as "cutting-edge chemical analysis for steroids, peptides, and pharmaceutical compounds," and frames the work as harm reduction chemical analysis. Its listed service categories span Peptides, Anabolic Steroids, SARMs and related compounds, SERMs and related compounds, Sexual health, Harm reduction, and Others.
What Janoshik tests
The peptide-specific services listed on the company's Services page include a GLP-1 blind test covering semaglutide, tirzepatide, and retatrutide; a "Human Growth Hormone amount, purity and dimer and higher molecular weight proteins analysis"; an "rHGH fragment or AOD-9604 (LCMS+CHNS) analysis"; ipamorelin analysis; and BPC-157 analysis. A blind test, in general analytical practice, means the sample's claimed identity is not disclosed to the analyst in advance, which reduces the chance of a result being nudged toward an expected answer.
Beyond identity and purity, a separate Harm reduction category lists safety-oriented tests: heavy metals screening (arsenic, cadmium, lead, and mercury), GCMS/LCMS screening for contamination, a CHNS mass report, endotoxin analysis, and sterility testing (TAMC plus TYMC).
Prices, as archived in June 2026, included the GLP-1 peptide blind test at 360 USD, the Human Growth Hormone amount, purity, dimer and higher-molecular-weight-proteins analysis at 500 USD, and blind common anabolic steroid screening (oils) at 145 USD. Pricing and service lists change over time, so the lab's current published schedule is always the authoritative reference.
How independent HPLC and mass-spec testing works
Two complementary techniques underpin most peptide identity-and-purity reports, and understanding them makes any certificate easier to read.
Reversed-phase HPLC measures purity
Reversed-phase high-performance liquid chromatography (RP-HPLC) is the primary method for assessing the purity of a synthetic peptide. The sample is carried through a column that separates the target peptide from related impurities, and the eluting compounds are monitored by ultraviolet absorbance (commonly around 220 nm, with the peptide bond itself often monitored near 214 nm). Purity is then reported as area-percent: the area of the main peak expressed as a fraction of the total detected chromatographic area (AAPS PharmSciTech, via NCBI PMC).
To be trustworthy, an RP-HPLC method is developed and validated for characteristics such as specificity, linearity, accuracy, precision, and limits of detection and quantification (LOD/LOQ), so that a number on a report reflects a controlled measurement rather than a one-off reading (RP-HPLC method development and validation, NCBI PMC). The fundamentals of how laboratory assays are read and reported are covered in depth at RawMarkers.
Mass spectrometry confirms identity
Area-percent purity answers "how much of the sample is a single dominant compound," but not "is that compound the right molecule." Mass spectrometry (MS) answers the identity question independently: it measures the monoisotopic mass of the peptide, and through MS/MS fragmentation it can confirm the amino-acid sequence. This is what separates the intended peptide from a substance that is pure but incorrect, a distinction that HPLC alone cannot make (AAPS PharmSciTech, via NCBI PMC).
Even with validated methods, quantifying a peptide is not trivial. Comparative work on peptide quantification (for example, a multi-method study using oxytocin) shows that different approaches can vary in reproducibility (Talanta, via ScienceDirect), which is one reason method transparency matters when results are compared across laboratories.
What a Janoshik report contains and how to read it
According to the company, when a sample is submitted for analysis the outcome is delivered as a "secure digital report received via email and in your account." The lab's own service names make the content concrete: its human growth hormone analysis, for instance, is described as covering amount, purity, and dimer and higher-molecular-weight proteins. Mapped onto the methods above, a peptide report generally addresses three separate questions: how much active compound was found (content or amount), how pure it is (area-percent from HPLC), and whether it is the correct molecule (identity from mass spectrometry).
Reading a report well therefore means resisting the urge to fixate on a single headline purity figure. A high purity value with no identity confirmation, or an identity match with no quantification, each tells only part of the story. The most informative reports are the ones where content, purity, and identity are all present and internally consistent.
How to verify a Janoshik report
For anyone assessing authenticity, the decisive feature is that Janoshik reports are designed to be checked with the lab directly rather than trusted as forwarded images. The company states that "every report in our database is verifiable via Verify tab in the menu or QR code on the report," and it operates a public Verify page whose stated purpose is to let anyone "verify the authenticity of any test conducted by our company."
In practice this means a certificate should be treated as unverified until it is confirmed at the source. Scan the QR code printed on the report, or enter its identifier in the lab's Verify tool, and confirm that the details returned by the lab match the document in hand. A screenshot or PDF passed around without that check proves little on its own, because images can be edited, reused, or attached to the wrong sample. Independent, at-source verification is the single most important habit when a report is being used as evidence of identity or purity, and it is the practical core of this site's approach to verifying authenticity.
What a report can and cannot tell you
Even a genuine, verified report has boundaries worth stating plainly:
- A result describes the specific sample that was submitted and analysed, not necessarily every other unit from the same source.
- Purity by area-percent is method-dependent: it reflects what the chosen detector and wavelength can see, so a high number is not an absolute guarantee that every possible impurity is absent.
- Identity and purity are separate questions. A strong purity figure means little without an identity confirmation, and an identity match means little without knowing the amount and purity.
- Safety-oriented tests such as heavy metals, endotoxin, and sterility are distinct analyses; a standard identity-and-purity report does not automatically include them.
These are general points about analytical testing that apply to any laboratory you might evaluate, not to Janoshik specifically. They are the reason a careful reader treats a single certificate as one data point rather than a final verdict.
The bottom line
Janoshik Analytical is a registered Czech laboratory (Janoshik s.r.o., ICO 17668727) that offers independent chemical analysis of peptides and related compounds. For a careful reader, its usefulness rests on two things that can be examined directly: the analytical methods behind a result (RP-HPLC for purity, mass spectrometry for identity) and the ability to verify each report at its source rather than on trust. Understanding both is what separates reading a certificate from merely seeing one.