Research by the Clean Label Project (CLP) reveals that 47% of tested protein powders exceeded at least one federal or state regulatory set threshold for heavy metal contamination such as lead and cadmium. However, US industry associations, the Natural Products Association and the Council for Responsible Nutrition (CRN), call the report’s methodology and outcomes into question. 

Both organizations say the CLP denied their requests to disclose the methodology and the data behind the allegations. 

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