We have all been sun burnt at one time or another, probably because we forgot sunscreen. But what does sunscreen really do for us?
The sun gives off three wavelengths of ultraviolet light which include UVA, UVB, and UVC. UVC doesn't reach Earth, but UVA and UVB can cause skin damage. You may not always see sun damage to your skin, you may not even be red. However that does not make it less dangerous, ultraviolet light can alter your DNA, prematurely age skin, and over time DNA damage can contribute to skin cancers.
How soon a sunburn begins depends on your skin type, the sun’s intensity in your part of the world, how long you are exposed, and how much SPF (Sun Protection Factor) is in your sunscreen. By combining organic ingredients like OMC (octyl methoxycinnamate) or oxybenzone, and inorganic ingredients like zinc oxide or titanium oxide, scientists have created sunscreen. Inorganic ingredients scatter ultraviolet radiation and organic ingredients absorb the radiation dissipating it as heat.