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The most important natural source of ultraviolet rays is the sun. Whereas its aggressive UVC rays are almost completely absorbed by the ozone layer, the UVA and UVB rays invisible to the human eye reach the earth – and also, therefore, everything that lives there. UV radiation can produce varying effects in the human skin depending on its wavelength and intensity.
Negative effects of UV rays outweigh the positive
Sunshine is good for us – it makes us feel good and chases away the blues. The negative and painful effects, such as sunburn, wrinkles and the risk of developing skin cancer, are the other side of the coin. It is true that the skin produces the essential, bone-building vitamin D3 with the aid of UVB rays, but no more than a small dose of just 15 minutes of sunshine a day is needed. The damage that UV radiation does to the skin weighs far more heavily. It can do permanent damage to the skin’s local immune system and the skin cells’ genetic material (DNA). This is true both of the short-wave UVB rays and also the long-wave UVA rays.