Vitamin D
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Vitamin D

Introduction Along with many other biological effects, vitamin D is a class of fat-soluble secosteroids that increases intestinal absorption of calcium, magnesium, and phosphate. The two most significant substances in this category for humans are vitamin D2 (ergocalciferol) and vitamin D3 (cholecalciferol). The primary natural source of vitamin D is the production of cholecalciferol in…