Vitamin D2

Vitamin D2 (ergocalciferol, Drisdol) is a form of vitamin D that helps regulate calcium and phosphate absorption and metabolism, supporting healthy bone mineralization. It is FDA-approved for the treatment of vitamin D deficiency and related conditions such as hypoparathyroidism and certain forms of rickets. High-dose regimens (such as 50,000 IU weekly) are commonly used to correct significant deficiency, followed by lower maintenance doses; periodic monitoring of serum vitamin D and calcium levels helps guide therapy and avoid vitamin D toxicity, which can cause hypercalcemia.