These vitamin D metabolites subsequently facilitate the active absorption of calcium and phosphorus in the small intestine, serving to increase serum calcium and phosphate levels sufficiently to allow bone mineralization. The first hydroxylation of vitamin D3 cholecalciferol (or D2) occurs in the liver to yield 25-hydroxyvitamin D while the second hydroxylation happens in the kidneys to give 1, 25-dihydroxyvitamin D. The in vivo synthesis of the predominant two biologically active metabolites of vitamin D occurs in two steps. Vitamin D acts as a hormone and increases reabsorption of Calcium and Phosphorus by the kidneys and increased bone turnover. It is also necessary for utilization of both Calcium and Phosphorus.
Vitamin D is essential for normal bone growth and development and to maintain bone density. Replesta Oral capsule, 14,000 intl units, 2000 intl units, 25,000 intl units, 400 intl units, 50,000 intl units, 5000 intl units), oral liquid, oral solution, oral tablet, oral tablet, chewable, oral tablet, disintegrating, oral wafer
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