Zinc Oxide- goodie What-it-does:sunscreen|Irritancy:0|Comedogenicity:1 When it comes to sunscreen agents,Zinc Oxide is pretty much in a league of its own. It's aphysical(or inorganic)sunscreenthat has a lot in common with fellow inorganic sunscreenTitanium Dioxide(TiO2) but a couple of thi...