Third-Party Lab Testing vs In-House Testing
Why the words 'lab-tested' and 'third-party tested' are not interchangeable.
Last updated: 18 April 2026
Defining the difference
In-house testing: the supplier tests their own product in their own lab. This isn't worthless — quality manufacturers run identity, purity and microbial tests as part of their internal QC — but it provides no independent check.
Third-party testing: an independent lab, with no commercial or ownership relationship to the supplier, tests the product. This is the level of evidence that survives scrutiny.
Why independence matters
An in-house lab has every incentive to confirm what the marketing claims. A third-party lab has no skin in the game — they report what they find, and their accreditation depends on accurate reporting.
When a supplier says 'lab tested', the next question is always: tested by whom? If the answer is the supplier itself, the value of the test is significantly lower than if the answer is a named, accredited, independent lab.
The Australian picture
NATA (National Association of Testing Authorities) accredits Australian labs against ISO 17025. NATA-accredited labs publish their scope of accreditation — what tests they're qualified to perform.
Reputable Australian-context COAs name the testing lab and reference its NATA accreditation number. This is the highest standard of testing-evidence available in the local market.