Titanium dioxide (E171) is a whitening and brightening agent — the same mineral compound used in sunscreen and paint. In food it makes candy coatings bright white, keeps frostings and coffee creamers opaque, and makes colors pop on gummies, chewing gum, and marshmallows. The FDA permits titanium dioxide as a color additive in food at up to 1% by weight, and it's been used for decades. It has no flavor, no calories, and no nutritional purpose — it's purely cosmetic.
The regulatory story diverged sharply in 2022. The European Food Safety Authority concluded in 2021 that titanium dioxide "can no longer be considered safe" as a food additive, citing concerns it could not rule out genotoxicity (potential to damage DNA), largely because of the nanoparticle fraction. Acting on that opinion, the EU banned titanium dioxide as a food additive effective August 2022. The US FDA has not followed; it continues to allow the additive, taking the position that the available evidence doesn't establish a safety concern at permitted levels. California considered banning it in the 2023 AB 418 bill but removed it before passage.
For kids, this is a genuine US-vs-EU split, which is why we tag it "limited." The additive concentrates in exactly the products kids reach for — bright candy, gum, marshmallows, white frostings, and some "yogurt-covered" coatings. Parents who want to match the EU's precautionary stance can avoid it; there's no evidence it provides any benefit to offset the uncertainty, since its only job is to make food look whiter or brighter.
How to spot it on a label: "Titanium dioxide," "titanium dioxide (color)," or the EU code E171. Because it's cosmetic, it clusters in visually engineered treats: chewing gum, bright candy shells, marshmallows, coffee creamers, white frosting and icing, and some coated snacks. USDA Organic products cannot use it. In the EU the same brands have already reformulated, so European versions of familiar candies are titanium-dioxide-free.