Nano titanium dioxide in sunscreens and skincare doesn't penetrate beyond your skin's outer layer or enter your bloodstream—even on damaged skin. It's not a carcinogen, mutagen, or reproductive toxicant at concentrations up to 25%. The main concern: avoid inhaling it from sprays and powders, where animal studies showed potential lung inflammation.

This was a review of existing human and animal studies on nano-TiO2 safety, evaluated by the European Scientific Committee on Consumer Safety (SCCS) and the European Chemicals Agency.

Funding not disclosed in abstract