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Vitamin D2 (ergocalciferol) is a form of vitamin D that's available as a dietary supplement. Vitamin D allows your body to absorb more calcium and phosphate, which is important to keep your bones healthy and strong. If you have problems with your parathyroid gland, your body doesn't make vitamin D very well on its own. Vitamin D2 (ergocalciferol) replaces the vitamin D your parathyroid gland isn't making.
