Heavy Metal Tested Matcha Brands

Why these brands qualify

Each brand has at least one documented heavy metal test result — either a brand-published COA or an independent test from a named third-party tester. Testing documentation is verified from brand websites and published independent test sources.

Useful for

Safety-conscious buyers, parents, pregnant women, and anyone who wants to verify heavy metal levels in their matcha before purchasing.

Strongest in collection

Teafy — Publishes numeric COA (ppb resolution, named lab, dated)

Heavy Metals in Matcha: What You Need to Know

Matcha is a whole-leaf powder, meaning it concentrates everything in the tea leaf — including heavy metals that accumulate from soil. Lead, cadmium, arsenic, and mercury are the primary heavy metals of concern in matcha. Lead is the most commonly detected at meaningful levels. The concentration depends on soil conditions, farming practices, and the specific farm — not just the brand or region.

What Heavy Metal Testing Measures

Heavy metal testing measures the concentration of lead (Pb), cadmium (Cd), arsenic (As), and mercury (Hg) in the matcha powder. Results are typically reported in parts per billion (ppb) or parts per million (ppm). ppb is 1,000 times more precise than ppm. For context, California Prop 65 sets a maximum allowable dose level for lead of 0.5 micrograms per day — for a 2g serving, this is approximately 250 ppb in the powder.

Brand COA vs. Independent Testing

Brand-published COAs are commissioned by the brand and may use the brand's preferred laboratory. Independent tests are conducted by third parties without brand involvement — consumer advocacy organizations, journalists, or independent labs. Both types of testing are valuable. Independent tests provide an additional verification layer since the brand doesn't control the results or the publication decision.

Which heavy metals are most concerning in matcha?

Lead is the most commonly detected heavy metal at meaningful levels in matcha. Cadmium is also present in some samples. Arsenic and mercury are generally detected at lower levels. Lead accumulates in older tea leaves and in plants grown in lead-contaminated soil. First-flush, shade-grown leaves (used for ceremonial grade matcha) may have different lead profiles than older leaves.

Is there a safe level of lead in matcha?

Regulatory limits vary by jurisdiction. California Prop 65 sets a maximum allowable dose level (MADL) for lead of 0.5 micrograms per day. The FDA's action level for lead in certain food categories is 100 ppb. Most high-quality matcha brands publish lead levels well below these thresholds. Consult a healthcare provider for personalized guidance, especially for children or pregnant women.

Does organic certification reduce heavy metal levels?

No. Organic certification prohibits synthetic pesticides and fertilizers but does not address heavy metal contamination from soil. Heavy metals are naturally occurring in soil and can be present in organic-certified matcha. Always check published COA data regardless of organic certification status.

How do I compare heavy metal levels across brands?

Use the comparison table on this page to compare published lead, cadmium, arsenic, and mercury levels across brands. Ensure you're comparing values in the same units (ppb vs ppm). A non-detect result is only comparable to a numeric result if the detection limit is specified.