Matcha Brands by Testing Status
Find matcha brands that publish lab results, COAs, and heavy metal testing data.
Most matcha brands claim to test. Very few publish the actual numbers. This directory separates brands by what they actually disclose: numeric ppb results with a named lab and date, ppm-only results, or no public data at all. Testing claims without published numbers are not the same as published testing.
Collections in Matcha Brands by Testing Status
Matcha Brands with Published COA
6 brandsMatcha brands that publish a Certificate of Analysis with numeric heavy metal results, a named lab, and a test date.
Heavy Metal Tested Matcha Brands
6 brandsMatcha brands with documented heavy metal testing — either brand-published COA or independent third-party test results.
Matcha Brands with Public Lab Results
4 brandsMatcha brands that publish numeric lab results publicly — accessible without requesting or purchasing.
Frequently Asked Questions
What is a COA?
A Certificate of Analysis (COA) is a document from an accredited laboratory that lists the measured levels of specific contaminants — typically heavy metals like lead, cadmium, arsenic, and mercury — in a tested sample. A meaningful COA names the lab, dates the test, and reports values in ppb (parts per billion) resolution.
What is the difference between ppb and ppm testing?
Parts per billion (ppb) is 1,000 times more precise than parts per million (ppm). A ppm non-detect result cannot rule out contamination at the ppb level. For heavy metals in food, ppb resolution is the meaningful standard.
Why do some brands claim testing but not publish results?
Brands may test internally without publishing results, or may share COAs only on request. We classify these as Tier 3 — they claim testing but provide no public verification. This is meaningfully different from brands that publish numeric results publicly.