The Sun – Beyond Vitamin D (Part 1)

Introduction The sun emits electromagnetic radiation, which encompasses a large spectrum of wavelengths. Of these, only infrared, visible light, and ultraviolet (UV) radiation are able to reach the earth’s surface and hence our skin.1 So far, most of the research regarding the effects of the sun on human health has focused on UV radiation,1, 2 which is divided into UVC, UVB and UVA.3 As depicted in figure 1, virtually no UVC radiation reaches the earth’s surface, except at extremely high altitudes, since it is efficiently absorbed by the stratospheric ozone layer.1-3 Ozone also absorbs most of the UVB and UVA…

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