Home › Guides › Janoshik vs In-House Testing: Why the Difference Matters By TorontoHealth Editorial · Updated June 17, 2026
Janoshik vs In-House Testing: Why the Difference Matters
The core idea: An independent lab and a vendor's own in-house testing are not the same thing. Independent testing — for example a widely used third-party lab like Janoshik — means a separate party ran the analysis. In-house means the seller graded its own homework.
What "independent" actually means
An independent result comes from a lab with no stake in the outcome. The value isn't the PDF itself — it's that the party running the test doesn't profit from a passing grade. That separation is the whole point.
Why in-house numbers deserve more scrutiny
When a seller tests its own product and publishes only the results it likes, you're seeing a curated picture, not an audit. This isn't an accusation against any specific company — it's a structural problem with self-reporting anywhere.
What to ask for
A COA that verifies on the testing lab's own portal.
The vendor named as the client on that report.
Ideally, independent blind testing — a buyer purchases off-the-shelf and submits it, so the sample can't be hand-picked.