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Protein powder can be a beneficial supplement for some people, such as athletes, older adults, vegetarians, and vegans. However, not everyone needs extra protein, and dieticians often recommend getting nutrients from food before turning to supplements.
A nonprofit organization called the Clean Label Project investigated the contents of 134 high-selling protein powders. The results showed that 75% of the protein powders they tested contained some level of lead, and 55% tested positive for BPA. The study also detected levels of mercury, arsenic and cadmium.