What is Janoshik testing for research peptides?

Janoshik Analytical is an independent third-party laboratory that analyses research compounds. Eternal Peptides Wholesale publishes applicable Janoshik reports on product pages, where customers can review the reported sample, batch, result, analysis date and verification details before ordering.

What does HPLC purity analysis measure in a peptide?

A peptide assessment report can state the measured peptide quantity per vial and a purity percentage. Purity describes the proportion of detected peptide material assigned to the principal peptide peak; it should not be confused with vial content, sterility or endotoxin results, which are separate measurements.

What is endotoxin testing and why is it important for research peptides?

Endotoxin testing measures bacterial endotoxin and reports the result in endotoxin units, commonly EU per vial and, where calculated, EU per milligram. It is distinct from microbial testing: a sample can have no viable microbial growth while still requiring a separate endotoxin result.

How do I verify a Janoshik COA is genuine?

Match the report's client, sample and batch to the product listing, then use its task number and unique verification key or QR code on Janoshik's verification page. The verification record should match the report displayed by Eternal Peptides Wholesale.

Are the same reports available for every product?

Report availability is product- and batch-specific. Customers should open the laboratory reports on the individual product page and review the tests and results attached to the exact listing before ordering.

Our testing standards

Research quality should be documented—not assumed.

Published 23 April 2026

By Dr. Sarah Chen, PhD Pharmacology

We use independent laboratory reports to make product quality visible. Explore what Janoshik testing is, the four areas our program focuses on, and exactly how to read and verify the reports attached to our research products.

Purity & vial contentMeasured results for the submitted peptide sample.

Sterility testingMicrobial screening with TAMC and TYMC results reported independently.

EndotoxinReported in endotoxin units per vial and/or per mg.

Heavy metalsElemental screening results displayed on the report.

Why independent testing

Evidence customers can inspect for themselves.

A supplier-written promise is not the same as a third-party laboratory result. Janoshik Analytical operates independently from Eternal Peptides Wholesale and issues its own report for the sample submitted. That separation matters: the testing result is produced outside our sales operation and carries its own task number, analysis date and verification credentials.

Our approach: publish the applicable laboratory reports with the product listing so researchers can assess the evidence before ordering. Report availability is product- and batch-specific—always review the exact reports shown on the individual product page.

What is Janoshik?

Janoshik Analytical is an independent laboratory that analyses research compounds and provides online report verification. Its reports identify the client, submitted sample, manufacturer and batch, then state the test requested, result and date analysed.

Independent reportThe laboratory, not our storefront, records the result.

Batch traceabilitySample and batch fields let you compare the report with the listing.

Direct verificationA QR code or task number plus unique key lets you check authenticity with Janoshik.

The four testing pillars

Four different questions. Four different results.

No single test tells the whole story. Purity, microbial quality, endotoxin and elemental contamination measure different characteristics, so each report needs to be read on its own terms.

A peptide assessment report states the measured quantity found in the submitted vial and a purity percentage. These are separate numbers: vial content answers “how much was measured,” while purity describes the relative cleanliness of the detected peptide material.

Read the sample name and batch first, then compare the measured mg result with the nominal vial strength and review the reported purity. Do not treat a purity percentage as proof of sterility or low endotoxin—those require their own reports.

For background on what a purity figure can miss, read about impurity types in synthetic peptides.

Look for: sample · batch · measured mg · purity %

Our published Janoshik sterility testing reports show TAMC (total aerobic microbial count) and TYMC (total yeast and mould count). These assess viable microbial contamination in the submitted sample.

A result such as “Pass” is read against the laboratory test reported on that document. This testing is distinct from endotoxin: absence of viable microbial growth does not itself provide an endotoxin measurement.

Look for: TAMC result · TYMC result

Bacterial endotoxins are lipopolysaccharide components associated with Gram-negative bacteria. Endotoxin testing reports a quantitative result in endotoxin units (EU), rather than a general “sterile” result.

Our published reports can show EU per vial and a calculation per milligram. Read the unit carefully: EU/vial and EU/mg are not interchangeable. Compare only like-for-like values and use the actual result printed on the relevant batch report.

Look for: EU/vial · EU/mg · analysis date

Read the EU/vial and EU/mg guide for worked examples and reporting-limit explanations.

Heavy-metals reports screen for specified elemental contaminants. The reports published in our library identify results for elements such as arsenic (As), lead (Pb), cadmium (Cd) and mercury (Hg).

Read every elemental line rather than relying on the heading alone. A result such as “not detected” means the laboratory did not detect that element under the conditions and detection capability of that analysis; it does not mean an absolute zero concentration can be inferred.

Look for: As · Pb · Cd · Hg · result for each

How to read a report

Start at the top. Verify at the bottom.

A result only has value when it can be connected to the right sample. Use this order every time you review a report.

Use our peptide batch-verification checklist to match the listing, packaging and laboratory documents before ordering and on receipt.

For background on purity figures, see the purity guide for Australian laboratories.

Match the sampleConfirm the client, sample name, nominal strength and manufacturer shown.

Match the batchCompare the laboratory batch field with the batch or report displayed on the product listing.

Identify the test requestedPurity, TAMC/TYMC, endotoxin and heavy metals are different analyses.

Read the result and its unitKeep mg, %, EU/vial and EU/mg separate; read elemental results individually.

Check timingReview testing ordered, sample received and analysis conducted dates.

Verify independentlyUse the report QR code or Janoshik task number and unique key to open the laboratory verification record.

Report field guide

Task numberThe laboratory's unique job reference. Use it during verification.

Sample & batchThe traceability link between the submitted vial and the product listing.

Tests requestedThe exact scope of that report. Never assume it covers tests not listed.

ResultsThe measured quantity, percentage, pass result, EU value or elemental finding.

Analysis conductedThe date on which the laboratory completed the analysis.

QR / unique keyThe route to Janoshik's independent verification record.

Open Janoshik report verification

What our standards mean

Transparency before the order—not promises after it.

Our testing standards are designed to help qualified researchers make an informed procurement decision. We make the available evidence accessible, explain what each result means, and provide a direct path to the laboratory's verification system. We do not combine separate tests into one vague “lab tested” badge, and we do not claim a test that is not shown on the applicable report.

Important distinction: laboratory reports describe the sample analysed. They do not constitute TGA registration, therapeutic approval, clinical evidence or a guarantee of suitability for any unapproved use.

Published report directory

Find the report attached to your product.

Direct links to 30 product listings and 82 uploaded reports. This directory reflects the files displayed on the product pages; it is not independent verification of their authenticity, batch coverage or results. Check the sample, strength, batch and analysis date on each report, and verify its task number and key with the issuing laboratory. Contact us if the report does not match your supplied batch.

For a text version listing each batch, laboratory task number, test dates and printed results, see the COA library.

Evidence customers can inspect for themselves.

Four different questions. Four different results.

Start at the top. Verify at the bottom.

Transparency before the order—not promises after it.

Find the report attached to your product.

See the evidence on the product page.

Testing and wholesale procurement: source notes

References and bibliography