This Sun Cream Mineral Sunscreen Stick shields your skin with non-nano zinc oxide. Organic zinc oxide is the active SPF ingredient that acts as a physical barrier laying on the top of your skin, protecting you from the sun's harmful UVA/UVB rays. This mineral based sunscreen does not enter your blood stream like other toxic chemical sunscreens do. Most traditional plastic sunscreens are made of chemicals, such as Oxybenzone and Octinoxate, and that when applied can go into your bloodstream. They are endocrine disrupting and in some cases cancer causing, as well as reef destroying.