“Janoshik-tested” has become the default trust signal in the research-peptide market — and, predictably, one of the most abused claims. Plenty of vendors print “Janoshik tested” with no report you can actually check. This guide explains what the phrase should mean in 2026, and — more usefully — how to verify any vendor’s Janoshik claim yourself in about a minute, so you never have to take a vendor’s word for it.
What “Janoshik-tested” should actually mean
Janoshik Analytical is an independent laboratory in Prague that the research community has used for years. A genuine “Janoshik-tested” claim means three specific things — and a vendor failing any one of them is waving a flag:
- A viewable report exists — not the words “third-party tested” in marketing copy, but an actual COA you can open.
- It carries a Task Number and a case-sensitive Unique Key — the two identifiers that resolve to the lab’s own record.
- It matches the batch you received — the lot number on the report corresponds to the vial in your hand, not a generic product sheet.
How to verify any vendor’s Janoshik claim (60 seconds)
- Open the COA the vendor publishes for the product (or ask for it before buying).
- Find the Task Number (top of the report) and the Unique Key (bottom, case-sensitive).
- Go to
public.janoshik.com(or scan the QR code on the COA) and enter both. - Confirm three things match: compound name, declared purity, and test date.
- If the key returns nothing — or resolves to a different product — the COA is reused or forged. That is the single most common scam pattern: a real Janoshik test number pasted onto an unrelated product.
For the full walkthrough see how to verify a peptide COA on Janoshik in 60 seconds. If the portal won’t load, see is Janoshik down? — keep your identifiers and re-check; an outage never excuses skipping verification.
The claims to distrust
- “Independently tested” with no report. A claim, not evidence. Vendor COA vs independent testing covers why this distinction decides everything.
- One COA reused across every batch. A certificate that isn’t matched to your lot is not a certificate of your product — see Match-Batch vs pooled testing.
- In-house “lab” results. The seller grading their own exam. Independent ≠ in-house.
- Expired reports. A 2022 COA presented as current for 2026 inventory tells you nothing about the vial shipping today.
More failure modes are catalogued in the 7 red flags of a fake peptide COA and why single-COA vendors are a problem.
What to demand before buying — from any vendor
Regardless of who you buy from, ask for a Janoshik COA whose Task Number and Unique Key resolve on the public portal, dated recently, with a lot number matching your order. A vendor who can produce that has earned the “Janoshik-tested” label. A vendor who can’t is asking for trust they haven’t backed with evidence.
Where Bastion fits
Bastion publishes a per-batch Janoshik COA for every lot, and ships the Task Number and Unique Key with each order so you can run the check above yourself. The full archive is public on the lab results page, and the methodology is explained in our Match-Batch guide. We’d rather you verify than trust us — that’s the entire point.
Frequently asked questions
How do I know a vendor’s Janoshik COA is real? Enter its Task Number and Unique Key at public.janoshik.com. If they resolve and match the product, purity, and date, it’s authentic. If not, it’s reused or forged.
Is “Janoshik-tested” a guarantee of quality? It’s a guarantee that one sample was tested. Pair it with a recent date and a lot number matching your vial, and prefer LC-MS identity confirmation for complex compounds (tirzepatide, retatrutide).
What if a vendor won’t share the COA before purchase? Treat that as a disqualifying answer. Any legitimate vendor can provide a verifiable COA on request.
For research use only. Not for human or veterinary consumption.