Protein powders and shakes are more popular than ever—touted as workout fuel or even meal replacements. But a new Consumer Reports investigation uncovered a hidden risk: some of these supplements contain concerning levels of lead.

Consumer Reports tested 23 popular protein powders and shakes. The results? Over two-thirds contained more lead in a single serving than what CR’s experts consider safe for an entire day. In some cases, levels were more than 10 times higher.

Plant-based products had the most concerning results. Plant-based powders had some of the highest levels of lead. They were nine times higher than the dairy-based protein powders CR tested, and double that of the beef-based powders CR tested.

Naked Nutrition’s Vegan Mass Gainer tested at roughly 1,570 percent of CR’s daily

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