Heavy Metals Testing
Heavy metals testing screens protein powders for lead, cadmium, mercury, and arsenic, four contaminants that can accumulate in plant-based proteins and lower-grade ingredients. Reputable brands publish heavy metals data per batch.
Why It Matters
Plant proteins (pea, rice, hemp) tend to test higher for heavy metals than dairy proteins because plants take up trace metals from soil. Chocolate-flavored powders can also carry slightly higher levels because cocoa naturally concentrates cadmium and lead.
Brands committed to clean sourcing publish heavy metals results, usually meeting California Proposition 65 limits as a minimum standard. ConsumerLab, Labdoor, and Clean Label Project are common independent verifiers.
How to Spot It on a Label
Heavy metals data is rarely printed on the tub itself. Look for badges like Clean Label Project Certified or claims like tested below Prop 65 limits. Cross-check brand websites for batch-level testing data and choose tested-clean products if heavy metals are a concern.
Examples from real products
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