Titanium dioxide (E171)

What is Titanium dioxide?

Titanium dioxide is a naturally occurring mineral that is purified and ground into a fine white powder. The food grade (E171) is chemically the same compound used in paint, sunscreen and toothpaste, but it has its own purity rules for food.

A notable feature of food-grade titanium dioxide is its particle size: EFSA reported that up to about half of the particles in E171 can be nanoparticles (smaller than 100 nanometers). That detail is at the center of the safety debate.

Why is Titanium dioxide used in food?

It is used purely for appearance. Titanium dioxide makes foods opaque and bright white, and it makes other colors on top of it look more vivid. You'll find it most often in candy shells and coated chocolates, frosting and cake decorations, chewing gum, coffee creamers and some dressings.

It has no taste and no nutritional role. Manufacturers who remove it switch to other whitening ingredients or accept a slightly less white product.

Is Titanium dioxide safe? What the research says

Why the EU banned it. In May 2021, EFSA's food additives panel concluded that titanium dioxide "can no longer be considered safe" as a food additive. Very little is absorbed from the gut, but particles can build up in the body, and the panel could not rule out genotoxicity — the ability to damage DNA. Because genotoxicity has no known safe threshold, EFSA did not set an acceptable daily intake. EFSA also said there was no conclusive proof of harm; the decision was precautionary.

Why other regulators disagree. The UK's Committee on Toxicity (2022), Health Canada (2022) and Food Standards Australia New Zealand reviewed EFSA's opinion and concluded the evidence does not show a health concern at dietary levels. In November 2023 the WHO/FAO expert committee (JECFA) reaffirmed an acceptable daily intake "not specified" — its lowest-concern category — finding no convincing evidence of genotoxicity from dietary exposure, while noting gaps in the data on nanoparticles.

Where that leaves you. No study has shown that titanium dioxide in food causes disease in people. The disagreement is about how much uncertainty is acceptable for an ingredient that is purely cosmetic. Since it adds nothing but whiteness, avoiding it costs little.

Titanium dioxide regulation: US vs EU

The FDA says titanium dioxide in food is safe under current rules. In April 2023, the Environmental Defense Fund and other groups petitioned the FDA to revoke its approval; the FDA has said it is reviewing the petition, and no decision had been announced as of September 2026. California considered banning it in its 2023 Food Safety Act (AB 418), but titanium dioxide was removed from the bill before it passed. Check the latest status: this petition could be decided at any time.

Who should limit or avoid Titanium dioxide?

• Anyone who prefers a precautionary approach. Titanium dioxide is cosmetic, so choosing products without it has no nutritional downside.
• Parents. Children tend to get the highest exposure because it is common in candy, gum and brightly decorated sweets.
• There are no known allergies or intolerances specific to titanium dioxide.