Pure Encapsulations Vitamin D3 25 mcg (1,000 IU) is a dietary supplement designed to support bone, joint, breast, prostate, heart, colon, and immune health. Each serving size of 1 vegetarian capsule contains Vitamin D (as cholecalciferol) 25 mcg (1,000 IU). The product is gluten-free, non-GMO, and hypoallergenic, making it suitable for a wide range of users. The capsules are made from hypoallergenic plant fiber (cellulose) and a vegetarian capsule (cellulose, water). This supplement promotes intestinal calcium and phosphorous absorption, reduces urinary calcium loss, and supports healthy bone composition. It also promotes cellular health, including support for breast and prostate tissue, cardiovascular function, and immune cell activity.