Vitamin d roles Facilitate intestinal absorption of calcium and phosphorus Promote renal reabsorption of phosphorus Direct effect on bone deposition and reabsorption of calcium and phosphorus Maintain calcium and phosphorus homeostasisVitamin D roles ➢ Facilitate intestinal absorption of calcium and phosphorus ➢ Promote renal reabsorption of phosphorus ➢ Direct effect on bone deposition and reabsorption of calcium and phosphorus ➢ Maintain calcium and phosphorus homeostasis