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Vitamin D and Skin Type
An interesting point to note is that the darker a person’s skin type, the lower their ability to synthesise Vitamin D. Vitamin D3 is produced in skin through ultraviolet irradiation of 7-dehydrocholesterol. It is biologically inert and must be metabolized to 25-hydroxyvitamin D3 in the liver and then to 1alpha,25-dihydroxyvitamin D3 in the kidney before function (DeLuca HF, 2004).