Last summer, there was a lot of talk of nanoparticles after the Environmental Working Group (EWG) and other consumer advocacy groups questioned their safety. Nanoparticles - specifically, those found in sunscreens - are ultra-small particles of zinc and titanium dioxide. Making the particles so small ensures that sunscreen goes on clear instead of remaining opaque, but comprehensive studies had never been done on their potential toxicity and the extent to which they're absorbed into the skin.
The EWG has since concluded that nanoparticles of zinc and titanium don't penetrate the skin enough to pose a potential hazard, and their list of recommended sunscreens doesn't take nanoparticles into account. But, if you want to be on the safe side just in case, you can still avoid nanoparticles in sunscreen. Model Angela Lindvall explains how below: