CR tested 23 of the most popular protein powders and ready-to-drink shakes sold in the U.S. The results were unsettling: more than two-thirds of the products contained more lead in a single serving than CR’s food safety experts say is safe to consume in a day. Some had 10 times that amount. One powder—Naked Nutrition’s Vegan Mass Gainer—contained 7.7 micrograms of lead per serving, which is 1,572% of CR’s level of concern. Another top seller, Huel Black Edition – a favorite among tech bros – registered 6.3 micrograms of lead, or 1,288% of CR’s limit.

The Consumer Reports test results include a list of protein supplements and the level of lead detected.

Three products also exceeded our level of concern for cadmium and inorganic arsenic, toxic heavy metals that have been classified as a probable human carcinogen and known human carcinogen, respectively, by the Environmental Protection Agency.

Cadmium and lead can be found in jewelry. There have been warnings on jewelry labels indicating children should not be wearing the jewelry item. When I saw those labels it made me not want the jewelry.