From Adam Ragusea.

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2025 Consumer Reports investigation of heavy metals in protein supplements: https://www.consumerreports.org/lead/protein-powders-and-shakes-contain-high-levels-of-lead-a4206364640/

2020 Toxicology Reports scholarly paper on heavy metals in protein supplements: https://pmc.ncbi.nlm.nih.gov/articles/PMC7509468/

2025 coverage of the Consumer Reports investigation in Chemical & Engineering News: https://cen.acs.org/food/food-ingredients/scientists-found-lead-protein-powders/103/web/2025/10

2025 coverage of the Consumer Reports investigation by Vox: https://www.vox.com/future-perfect/465552/protein-powder-lead-poisoning-fda-supplements-consumer-reports

FDA lead reference levels: https://www.fda.gov/food/environmental-contaminants-food/lead-food-and-foodwares

California Prop 65: https://oehha.ca.gov/proposition-65/law/proposition-65-law-and-regulations