What is the active element in sunscreen?

Sunscreen: Sunscreens work via 2 possible ways: 1) chemical blocks that breakdown the uv rays as they pass through the skin and 2) physical blocks that prevent the uv rays from getting to the skin. I recommend the physical blocks (zinc and titanium) because they have a very good safety profile and work very effectively. If you are going to be in the sun - use a minimum of SPF 15 - follow product directions.

2 major ingredients: Titanium dioxide and zinc oxide are the 2 safest and most effective ingredients.