Mineral-based sunscreen that offers proper mineral protection against the sun is highly recommended. The mineral contents like zinc oxide and titanium dioxide are suitable for your skin against the sun. So yes, zinc oxide is a useful mineral and natural ingredient to have in your sunscreen. It does not go inside your skin; it sits on your skin and protects it entirely against the sun, which is the main objective of a sunscreen. Always get checked that you don’t have a particular allergy against the mineral before using it.