Many protein powders and shakes have high lead levels, Consumer Reports analysis shows

The popularity of protein – and the idea that people aren't eating enough of it – has taken off in recent years.

Research shows that getting enough protein helps build muscle, reduce hunger and cravings, strengthen the immune system, increase metabolism and sustain weight loss. Social media influencers have been promoting protein powders as a convenient way to boost protein intake. MORE: What should you look for when picking a protein bar? Here are some suggestions

But a new Consumer Reports analysis suggests that many popular protein powders contain high lead levels, and that the dangers of using them probably outweigh any benefit.

"We advise against daily use for most protein powders, since many have high levels of heavy metals and none are necessary to hit your protein goal