Abstract
VITAMIN D, the “sunshine vitamin”, is produced in the skin when ultraviolet radiation is absorbed by the pro-vitamin 7-dehydrocholesterol1. The endogenous vitamin, together with dietary vitamin D, is then apparently converted in the liver to 25-OH vitamin D, and this active metabolite facilitates the intestinal absorption of calcium and the uptake and release of calcium by the skeleton2,3.
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NEER, R., DAVIS, T., WALCOTT, A. et al. Stimulation by Artificial Lighting of Calcium Absorption in Elderly Human Subjects. Nature 229, 255–257 (1971). https://doi.org/10.1038/229255a0
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DOI: https://doi.org/10.1038/229255a0
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