https://people.com/chemical-chlormequat-infertility-puberty-found-cheerios-quaker-oats-8583154

"Chlormequat — a chemical that's been linked to reproductive and fertility issues in animal tests — has been found in oat-based products like Cheerios and Quaker Oats.

The chemical has been banned for use on edible plants in the United States, but in 2018, the Environmental Protection Agency began allowing plants treated with chlormequat to be imported.

"All our products adhere to all regulatory requirements," said Mollie Wulff, a spokesperson for General Mills, which manufactures Cheerios."