A new study led by a team of researchers and scientists from Florida International University shows that rice cereal— a food that’s likely to be included in childrens’ diets can also be a potential source of mercury.

The team purchased 119 common brands of rice, multigrain, and non-rice cereals from local grocery stores and online. The results showed that rice cereals had on average three times the amount of methylmercury, the most concerning type, as multigrain cereals, and 19 times the amount in cereals made with grains other than rice.

Chair of the Department of Chemistry and faculty member of the Biochemistry and the Southeast Environmental Research Center at FIU, Dr. Yong Cai, said “For infants, we typically think of mercury coming from breast milk, but this study shows that there are other sources we haven’t considered.”

Read more about the growing concern and what parents can do.