Glyphosate or Round-up weed killer in some foods. It causes cancer.
Here is the list with the highest levels of glyphosate include:

Honey Nut Cheerios Medley Crunch
Nature Valley Crunchy Granola Bars, Maple Brown Sugar
Nature Valley Granola Cups, Almond Butter
Chocolate Peanut Butter Cheerios
Nature Valley Baked Oat Bites
Nature Valley Crunchy Granola Bars, Oats and Honey
Nature Valley Crunchy Granola Bars, Peanut Butter
Nature Valley Granola Cups, Peanut Butter Chocolate
Nature Valley Fruit & Nut Chewy Trail Mix Granola Bars, Dark Chocolate Cherry
Nature Valley Granola Protein Oats n Dark Chocolate
Multi Grain Cheerios
Nature Valley Soft-Baked Oatmeal Squares, Blueberry
Fiber One Oatmeal Raisin Soft-Baked Cookies
Nature Valley Granola Peanut Butter Creamy & Crunchy
Nature Valley Biscuits with Almond Butter
Bon appetit,
Jake