Janoshik vs PeptideVerify: How UK Labs Verify Purity

Why the lab name belongs on the COA

A Certificate of Analysis is only as good as the laboratory that signed it. If the document doesn't name the testing lab, you can't independently verify the analysis. If the lab is named, you can in principle check the lab's existence, its accreditation status, and (in some cases) confirm individual reports.

Two analytical laboratories appear most often on UK research-peptide COAs in 2026: Janoshik Analytical (Czech Republic) and PeptideVerify (United States). They are independent third parties — they don't sell peptides themselves, they test material submitted by manufacturers and retailers.

This post is a neutral description of both. It does not rank them or recommend one over the other; it explains what each does and how to read their reports so you can verify what's in front of you.

Janoshik Analytical

Janoshik Analytical is an EU-based analytical chemistry laboratory headquartered in the Czech Republic. The lab provides HPLC purity testing and mass spectrometry confirmation for research peptides and related compounds.

A Janoshik report typically includes:

- A header with the lab name, address, and analysis date. - The customer / submitting party. - The sample identifier (batch / lot number). - An HPLC chromatogram with retention time, peak-area table, and an integrated purity percentage. - A mass-spectrometry trace with observed mass against the theoretical mass of the peptide. - The analyst's signature or a LIMS reference.

Janoshik is used by Peptify for all batch testing. Every Peptify Certificate of Analysis is a Janoshik report tied to the batch printed on the vial. The current Peptify BPC-157 reference batch is 2026/04 and its COA is downloadable from the product page.

PeptideVerify

PeptideVerify is a US-based analytical service that provides HPLC and mass spectrometry testing for peptide samples submitted by retailers and manufacturers. Reports include the same general structure — chromatogram, peak integration, purity number, mass-spec confirmation — packaged in PeptideVerify's own template.

PeptideVerify is used by a range of US-based and US-shipping retailers, and occasionally appears on UK-shipping retailers' COAs where the testing has been outsourced to a US lab.

One Peptify product line — MOTS-C — currently uses a PeptideVerify report rather than Janoshik. This is flagged neutrally and the COA is available on the product page in the usual way. The reason is supplier-side testing chain provenance, not a quality judgement about either lab.

What both labs share — and what they don't

Both labs run HPLC for purity and mass spectrometry for identity. Both produce per-batch reports tied to a sample identifier. Both name themselves on the document so the report is verifiable.

Where they differ is mostly format, lab-specific column / mobile-phase conditions, and the LIMS / report layout. The underlying analytical methods are the same family of techniques used across the peptide industry worldwide. A purity figure of 99.2% from either lab means the same thing methodologically: the integrated peak area of the target peptide accounts for 99.2% of the total integrated peak area across the chromatogram.

What neither lab does is certify that a vial in your hand is the vial they tested. The batch / lot number on the vial must match the report. If it doesn't, the report doesn't apply to the vial.

Reading either report — the same five checks

Regardless of which lab issued the document, the same five checks apply.

1. Does the batch / lot number on the report match the number on the vial? If no, stop.

2. Is there a chromatogram image visible on the report (not just a number)? Genuine HPLC reports include the trace.

3. Is the purity number derived from the chromatogram, with a peak-area table or equivalent? A bare number floating on a page is not the same as an integrated result.

4. Is there a mass-spectrometry section confirming the observed mass against the theoretical mass of the peptide?

5. Is the laboratory named and contactable? An anonymous report is unverifiable.

Applied to either a Janoshik COA or a PeptideVerify COA, these five checks tell you whether you are looking at a real analytical document.

Why naming the lab is the bar

A retailer that names its testing lab — and ships per-batch COAs — has structurally committed to a level of transparency that an unnamed-lab retailer hasn't. It does not by itself guarantee quality, but it makes the retailer's claims about quality independently checkable. That asymmetry — checkability — is what separates a research-grade supply chain from a marketing claim.

When you evaluate a UK research peptide supplier in 2026, the single most useful question is which analytical laboratory tested the batch you'd be shipped. If the answer is a real lab with a real address, you have something to work with. If the answer is silence or 'we don't disclose that', the document — whatever it looks like — is unverifiable.