Janoshik testing, audited.

The 200 publicly-submitted tests in our local mirror cluster heavily on the GLP-1 mainstream. The compound mix and shipping origin are the structural signals worth knowing before reading any single COA.

Is Janoshik testing legit?

Yes. Janoshik Analytical is a real third-party lab that specializes in research-peptide HPLC purity quantification and mass-spec identity confirmation. Every test resolves to a verifiable COA at verify.janoshik.com, and the QR codes on their certificates point to records on Janoshik servers — not on the vendor's site, which is why fabricated COAs fail against the public database. Our own audit of 200 publicly-submitted tests confirms the lab process is consistent. See our full writeup: Is Janoshik testing legit? An audit of the lab and its data.

Where is Janoshik located?

Janoshik Analytical operates from the Czech Republic in the European Union. The public-tests database at public.janoshik.comis accessible internationally; per-test verification URLs are at verify.janoshik.com. The lab's EU location is part of why their COAs are trusted across the US, UK, and Canadian research-peptide markets — they are not subject to direct US regulatory pressure on the vendors they test.

How much does Janoshik testing cost?

Pricing is set per assay on Janoshik's site and varies by test type. Common services: HPLC purity quantification, LCMS identity, blind GLP-1 multi-compound tests, and full vial assessment with sterility. Vendors pay for the tests they submit; buyers can submit independent samples at the same fee schedule. For current pricing, see Janoshik's site directly — we don't republish their fee schedule because it changes.

Does Janoshik test tirzepatide and retatrutide?

Yes. Across our 200-test mirror, retatrutide and tirzepatide are the two most-tested compounds — 44 retatrutide tests and 33 tirzepatide tests in the public corpus as of May 2026. Janoshik's "blind GLP-1 multi-compound test" is specifically designed to catch identity-fraud cases (a compound labeled as one peptide turning out to be a different one in mass-spec).

How do I verify a Janoshik COA?

Match three fields exactly between the certificate and the public-database entry: compound identity, purity percentage, and sample-receipt date. Then confirm the batch ID on the vial in your hand matches the batch ID on the COA. The full four-step protocol — including how to spot fabricated certificates — is in our Janoshik verify guide.

Janoshik vs Finnrick — what's the difference?

Both are third-party peptide testing labs. Janoshik publishes a QR-verified public-tests database where every certificate resolves to a record on Janoshik's servers — vendors cannot edit their COAs after the fact. Finnrick publishes a larger overall test count (the cited "7,164 tests" figure) but its lab-assignment methodology is not public, and independent auditors have flagged transparency concerns. We cover the difference in our 7,164-tests purity analysis.