Skin-Pigment Regulation of Vitamin-D Biosynthesis in Man

@article{Loomis1967SkinPigmentRO,
  title={Skin-Pigment Regulation of Vitamin-D Biosynthesis in Man},
  author={William F. Loomis},
  journal={Science},
  year={1967},
  volume={157},
  pages={501 - 506}
}
  • W. Loomis
  • Published 4 August 1967
  • Physics
  • Science
The known correlation between the color of human skin and latitude (Fig. 2) is explainable in terms of two opposing positive adaptations to solar ultraviolet radiation, weak in northern latitudes in winter yet powerful the year around near the equator. In northern latitudes there is selection for white skins that allow maximum photoactivation of 7-dehydrocholesterol into vitamin D at low intensities of ultraviolet radiation. In southern latitudes, on the other hand, there is selection for black… 

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...

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