Zinc oxide sits on top of your skin (rather than soaking in, like chemical sunscreens do) and protects by scattering, absorbing, and reflecting the sun’s rays.
It can stand alone as a sunscreen because it is truly effective against UVA and UVB rays — this is called a “broad-spectrum blocker.” But zinc oxide isn’t just effective at blocking the sun! It’s also good for the skin.
The concern with these super-small nanoparticles is that they can find their way into your body by penetrating your skin and getting into your bloodstream. And while a nanoparticle will enter your bloodstream, a non-nano particle won’t. For that reason, non-nano is considered safer.
Zinc is also known to be an effective treatment for skin concerns like perioral dermatitis, eczema and psoriasis