Dietary Reference Intakes for Calcium, Phosphorus, Magnesium, Vitamin D, and Fluoride

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Dietary Reference Intakes for Calcium, Phosphorus, Magnesium, Vitamin D, and Fluoride (1997)
Institute of Medicine (IOM)

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DRI DIETARY REFERENCE INTAKES FOR Calcium, Phosphorus, Magnesium, Vitamin D, and Fluoride

FIGURE 7-2 Photosynthesis of vitamin D₃ and the metabolism of vitamin D₃ to 25(OH)D₃ and 1,25 (OH)₂D_3. Once formed, 1,25(OH)₂D₃ carries out the biologic functions of vitamin D₃ on the intestine and bone. Parathyroid hormone (PTH) promotes the synthesis of 1,25(OH)₂D₃, which, in turn, stimulates intestinal calcium transport and bone calcium mobilization, and regulates the synthesis of PTH by negative feedback. Reproduced with permission, Holick (1996).