Sencha Naturals Organic Matcha (Costco)
Summary
Sencha Naturals Organic Matcha (sold at Costco) scores 55/100. USDA Organic 100% Japanese green tea powder. Lead Safe Mama 3rd-party lab testing (April 2025) returned the HIGHEST mercury reading of any matcha in the chart — 7.7 ppb — along with 73 ppb lead, 12.5 ppb cadmium, and 22.1 ppb arsenic. Single ingredient, but the metal burden pulls the score down hard.
At a glance
Contaminants 4
Source: Lead Safe Mama
Lead 73 ppb High
Detected at a high level — at or above health-based exposure limits. Regular exposure at this level is a genuine health concern. No safe level of lead exposure per federal agencies.
Lead Safe Mama 3rd-party lab testing (April 2025) detected 73 ppb lead.
Arsenic 22.1 ppb Low
A low level of arsenic — present but modest; a sourcing-quality note rather than a safety concern at typical intake.
Lead Safe Mama testing detected 22.1 ppb arsenic.
Cadmium 12.5 ppb Trace
A trace amount of cadmium — within the range expected from normal soil uptake/processing and below our concern threshold.
Lead Safe Mama testing detected 12.5 ppb cadmium.
Mercury 7.7 ppb Low
A low level of mercury — present but modest; a sourcing-quality note rather than a safety concern at typical intake.
Lead Safe Mama testing detected 7.7 ppb mercury — the HIGHEST mercury reading of any matcha tested in the April 2025 chart. The lab explicitly flags this as 'no safe level of mercury to consume.'
Key ingredients 1
Organic Japanese Green Tea PowderVery Good
USDA Organic 100% Japanese green tea powder. Single-ingredient NOVA 1 food — minimally processed with antioxidant catechins, L-theanine, and chlorophyll.
See more about Organic Japanese Green Tea Powder →Processing
Unprocessed or Minimally Processed Foods
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