Your morning muscle gains may be coming with a side of metal poisoning.

A Consumer Reports investigation released this week found that many protein shakes and powders contain “troubling levels” of toxic heavy metals.

Protein has long been a staple of fitness fanatics and those looking to improve their muscle mass, but recently protein and supplements have broken into the mainstream. It’s more than just powders, shakes and bars; protein has become the latest health phenomenon. From oatmeal, ice cream, chips, pasta sauce — anything you can imagine — hundreds if not thousands of people on the internet have built followings around protein-focused meals and eating. Even the Kardashians jumped on the trend with Khloe recently dropping a line of protein popcorn.

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