Pesticide tied to reproductive issues found in Cheerios, Quaker Oats and other oat-based foods

A little-heard-of pesticide linked to infertility in animals is showing up in the overwhelming majority of oat-based foods sold in the United States, including popular cereal brands Quaker Oats and Cheerios.

The chemical, chlormequat, was detected in 77 of 96 urine samples taken from 2017 and 2023, with levels increasing in the most recent years, a new study by the Environmental Working Group finds.

Further, chlormequat was found in 92% of oat-based foods sold in May 2023, including Quaker Oats and Cheerios, according to the research published Thursday in the Journal of Exposure Science and Environmental Epidemiology.