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Sunscreens are topicals which contain chemical actives to help absorb the sun's harmful ultraviolet radiation. Sunscreen actives in the US include cinnamates, benzophenones, salicylates, PABA, titanium dioxide and zinc oxide. Sunscreens are labelled with SPF or sun protection factor which helps to tell us how much time it takes for our skin to burn from UVB rays on skin with sunscreen versus skin without sunscreen. If it takes 5 minutes for you to sunburn, SPF 15 protects offers you 75 minutes of protection before getting sunburned or 15 times longer than your skin without sunscreen protection.