How does SPF work?Updated a year ago

SPF, or Sun Protection Factor, works by absorbing, reflecting, or scattering sunlight, specifically the harmful UV rays. Chemical sunscreens contain organic (carbon-based) compounds that absorb UV radiation, convert it into heat, and then release it from the skin. Physical sunscreens, on the other hand, contain minerals like zinc oxide or titanium dioxide that sit on the skin's surface and reflect UV rays away from the skin. By preventing UV rays from penetrating the skin, SPF reduces the risk of sunburn, premature ageing, and skin cancer.