Sunlight, UV Radiation, Vitamin D, and Skin Cancer: How Much Sunlight Do We Need?

  title={Sunlight, UV Radiation, Vitamin D, and Skin Cancer: How Much Sunlight Do We Need?},
  author={Michael F Holick},
  journal={Advances in experimental medicine and biology},
  • M. Holick
  • Published 2020
  • Medicine
  • Advances in experimental medicine and biology
Vitamin D is the sunshine vitamin for good reason. During exposure to sunlight, the ultraviolet B photons enter the skin and photolyze 7-dehydrocholesterol to previtamin D3 which in turn is isomerized by the body's temperature to vitamin D3. Most humans have depended on sun for their vitamin D requirement. Skin pigment, sunscreen use, aging, time of day, season, and latitude dramatically affect previtamin D3 synthesis. Vitamin D deficiency was thought to have been conquered, but it is now… 
5 Citations
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