| http://www.w3.org/ns/prov#value | - UVB is necessary for the synthesis of active vitamin D.30 At least about 90% of active vitamin D in each person is generated in this way.30 However, humans can obtain vitamin D from other sources besides sun exposure, such as fortified milk, fish oil and vitamin supplements.18 After sun exposure, 7-dehydrocholesterol in the skin is converted to previtamin D3 and then to vitamin D3 (cholecalciferol
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