Nano-titanium dioxide (the tiny particles used in sunscreens) doesn't penetrate past your skin's outer layer and doesn't enter your bloodstream, even on damaged skin. At concentrations up to 25%, it shows no evidence of causing cancer, genetic damage, or reproductive harm. The main concern: avoid inhaling it, so skip nano-TiO2 in spray sunscreens and powders—but creams and lotions are considered safe.

This was a safety review by the European Scientific Committee on Consumer Safety (SCCS), analyzing existing human and animal research on nano-titanium dioxide across skin, lung, and digestive exposure routes.

Funding not disclosed in abstract