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Nanotoxicology “focuses on determining the adverse effects of nanomaterials on human health and the environment.”

A 2012 study published in the journal Environmental Science & Technology noted that children are especially exposed to titanium dioxide because of the food that contains the food additive and is particularly marketed to children, including candy and cakes.

It's hard to determine the total amount of food products that have titanium dioxide because federal regulations don't require all producers to list its use on ingredient labels, but the list of foods containing the substance certainly doesn't end with Skittles.