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Vitamin D is both a nutrient we eat and a hormone our bodies make. It is a fat-soluble vitamin that has long been known to help the body absorb and retain calcium and phosphorus; both are critical for building bone.
9:4850:55Calcium, Phosphorus & Vitamin D - Kate Wesseling, MD - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo calcium and phosphorus both this a form of the vitamin D acts.MoreSo calcium and phosphorus both this a form of the vitamin D acts.
Abstract. Vitamin D functions by stimulating intestinal calcium and phosphorus absorption, by stimulating bone calcium mobilization, and by increasing renal reabsorption of calcium in the distal tubule. These functions on bone and possibly kidney, but not intestine, require the parathyroid hormone.
The main function of vitamin D is to maintain calcium (Ca) and phosphorus (P) balance in the body by promoting Ca and P absorption from the intestines and kidneys (5). In vitamin D deficiency, only 10%-15% of calcium and 50%-60% of phosphorus can be absorbed from ingested foods (6).