High-protein foods have been trending recently, promising to help build muscle, boost bone mass, and make you feel fuller longer.

So I nearly spit out my smoothie when I read that a new study from Consumer Reports found that many popular protein powders also contain more lead per serving than their experts advise consuming in a single day. The plant-based protein powders tended to contain the highest lead levels, while animal and whey-based options tended to be on the lower side.

Lead is a toxic heavy metal that can build up in the body over time through repeated exposures. Lead poisoning can cause symptoms ranging from cognitive problems to high blood pressure, and the effects in children can be particularly severe.