whenever i plan to go out in the skin ,i am very careful and use sunscreens to protect my skin from the harmful uv radiation,but none of these help in protecting my skin that much and i end up being tanned.as it is i am dark skinned and if i get further exposure from the skin then i will go really dark and i dont want that to happen.so my friend who goes to jog with me in the morning told me about Zinc Oxide Sunscreen .how is Zinc Oxide Sunscreen more effective and powerful than the other sunscreens for uv rays protection?