The complete test results are publicly available in our online archive. In addition, we archive reports per batch for immediate retrieval — on request we send both a summary and the full PDFs for a specific batch.

We never buy tea blindly. We receive the complete laboratory tests from our Japanese supplier immediately upon closing the order — without them, we do not purchase the tea at all. Moreover, Japanese suppliers provide us with considerably more extensive control documentation than European standards require. In the Czech Republic, we then perform only verification laboratory tests for double assurance. Every delivered batch is therefore fully tested before we even purchase it — publication of the results in the online archive may simply lag slightly behind the delivery.

The obligation to perform radioactivity measurements on imported Japanese teas was abolished in 2014. Japanese suppliers continue to carry out control measurements under their own standards, but we are no longer subject to this obligation — which is why we do not publish radioactivity tests.

No. There is currently no regulation that would oblige us to present laboratory tests to customers. The seller is responsible for the quality of the teas and, in case of non-compliant results, for ensuring the product is withdrawn from the market — but no retailer is obliged to test every batch. Kyosun tests every batch primarily for its own control, and at the same time to make buying tea from us as trustworthy as possible for our customers. Testing costs us several thousand euros a year — but that is also why Kyosun has been on the market since 2010, having built a trusted name among its customers.

Do you keep seeing sellers show you the very same tests over and over? Be very careful about this. Every batch of matcha consists of different blends of tencha tea, so it is not realistic for a seller to present summary or long-standing laboratory tests. Remember: one batch, one separate laboratory test — and that is exactly what you can demand from sellers.

Primarily accredited laboratories, e.g., ALS. The scope/LOQ follows the methodologies of the given laboratory.

Yes, we conduct long-term comparative testing across regions. We prefer Japanese origin for stability and safety.