High levels of lead have been detected in numerous protein powders sold in the United States, according to an investigation by Consumer Reports, the nonprofit consumer advocacy organization dedicated to independent product testing.

The report, published on Tuesday (October 14), noted that the average lead content found in these products has increased compared to previous years.

Specifically, out of 23 protein powders tested, more than half contained over 0.5 micrograms of lead per serving—an amount that exceeds what a person can safely consume in a day without health risks.

Two of the tested products contained such high levels of lead that Consumer Reports recommended avoiding them entirely.

“We do not recommend daily use of most protein powders because many contain high levels of heavy metals, and none are necessary to meet your protein goals,”
said Tunde Akinleye, lead researcher at Consumer Reports.

In recent years, demand for high-protein foods and supplements has skyrocketed in both the U.S. and Europe, partly because protein helps increase satiety and reduce overeating, but mainly due to people’s desire to build muscle mass.

However, health experts warn that many Americans are already consuming more protein than they need, and that additional protein from fortified supplements, shakes, or processed foods is often unnecessary.