WASHINGTON, D.C. (CBSNEWS.COM) – Twenty-one oat-based cereal and snack products popular with children contain traces of glyphosate, the active ingredient in the weed killer Roundup, according to tests from the Environmental Working Group.

(credit: Justin Sullivan/Getty Images)

EWG said the tests found glyphosate levels above what it considers safe for children in all but four of the products.

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