How to verify a Janoshik peptide certificate of analysis

Most UK research-peptide sellers show a "certificate of analysis" (COA). Many are self-made, borrowed from a supplier, or simply invented. Here is exactly how to tell a genuine, verifiable Janoshik report from a fake, in four checks that take about two minutes.

Why a Janoshik COA is the gold standard

Janoshik Analytical, in Prague, is the independent laboratory the serious end of the research-peptide industry relies on. Every genuine Janoshik report carries a unique code you can check on Janoshik's own website, so the result cannot be faked or edited after the fact. There is no peptide-testing laboratory in England, so any British shop claiming testing by an unnamed "accredited UK lab" should be treated with suspicion, see how we audit.

The four checks

1. An independent laboratory must be named

A real COA names the outside lab that ran the test. If the document is just the seller's own branding with no independent lab named, it is self-made, the seller marking its own homework, and proves nothing.

2. The client field must name the seller you bought from

Read the Client and Manufacturer fields. They must name the shop you actually bought from. If they name a different company, often a Chinese wholesaler such as Lilipeptides, Uther Peptide or InnoPeptide, or a brand the seller has abandoned, the certificate is borrowed: it proves a supplier's batch was once clean, not what this seller ships you.

3. It must be recent and carry a batch number

A certificate only covers the single batch tested. Sellers re-order stock constantly, and each new batch is a separate, untested run. An old or undated certificate says little about the vial posted to you today.

4. You must be able to verify it yourself

Enter the report's unique key at verify.janoshik.com. If the code does not resolve on Janoshik's own site, treat the document as fabricated, however convincing it looks.

What the fakes look like

• Self-made / in-house: the seller's own template, no independent lab, often a suspiciously round "100.00%" purity.
• Borrowed: a genuine Janoshik report whose client is someone else.
• Fabricated: wrong layout, no task number, no working verify link.
• Stale: a real report that is months or years old.
• "COA on request": nothing published, a promise to email a document after you have paid.

Check a certificate now, free

Upload any certificate to the COA Checker for an instant, independent read, cross-referenced against our audit of every UK vendor.

Then see which UK sellers actually publish their own verifiable Janoshik COA: the independently-tested list (20 of 173 vendors).