You'll want double check the ingredient list on your cereal box before eating it this morning.
An environmental advocacy group claims several popular breakfast foods contain the cancer-causing ingredient, found in Roundup.
Cheerios and Nature Valley products are among the foods named that are contaminated with glyphosate.
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General Mills said the levels are much lower than federal limits.
According to EWG Children's Health Initiave, the two highest levels of glyphosate were found in Honey Nut Cheerios Medley Crunch, with 833 parts per billion, or ppb, and Cheerios, with 729 ppb. The EWG children’s health benchmark is 160 ppb.