Vitamin D is a fat-soluble vitamin. Vitamin D exists in two forms; vitamin D3 (cholecalciferol) and vitamin D2 (ergocalciferol). Vitamin D3 is produced in the skin from 7-dehydrocholesterol when the skin is exposed to ultraviolet radiation. Vitamin D2 is obtained only from nutrients. Approximately 90% of bodys vitamin D requirements are met by the sun exposure, 10 % by the food.
Vitamin D status is measured by the circulating levels of 25-hydroxyvitamin D [25(OH)D]. A blood level of 25(OH)D
Key words: Pregnancy, Vitamin D, Vitamin D requirements. Article Language: Turkish English
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