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Ergocalciferol is vitamin D2. Vitamin D is important for the absorption of calcium from the stomach and for the functioning of calcium in the body. Ergocalciferol is used to treat hypoparathyroidism (decreased functioning of the parathyroid glands).Ergocalciferol is also used to treat rickets (softening of the bones caused by vitamin D deficiency) or low levels of phosphate in the blood (hypophosphatemia).Ergocalciferol may also be used for purposes not listed in this medication guide.o not use this medication if you have ever had an allergic reaction to vitamin D, or if you have: 1  high levels of calcium in your blood (hypercalcemia); 2  high levels of vitamin D in your body (hypervitaminosis D); or. 3  any condition that makes it hard for your body to absorb nutrients from food (malabsorption).
Vitamin B12 is a nutrient that helps keep the body's nerve and blood cells healthy and helps make DNA, the genetic material in all cells. Vitamin B12 also helps prevent a type of anemia called megaloblastic anemia that makes people tired and weak.Two steps are required for the body to absorb vitamin B12 from food.First, hydrochloric acid in the stomach separates vitamin B12 from the protein to which vitamin B12 is attached in food.After this, vitamin B12 combines with a protein made by the stomach called intrinsic factor and is absorbed by the body.Some people have pernicious anemia, a condition where they cannot make intrinsic factor.fter this, vitamin B12 combines with a protein made by the stomach called intrinsic factor and is absorbed by the body. Some people have pernicious anemia, a condition where they cannot make intrinsic factor.