Hi Dee Vitamin D3 10,000 IU is a dietary supplement containing cholecalciferol in soft gelatin capsules. Each capsule provides 10,000 IU of vitamin D3 to help maintain healthy bones, teeth, muscles and immune function by supporting proper calcium absorption. Vitamin D3 is essential for calcium absorption and bone health. It helps prevent conditions like rickets in children and osteoporosis in adults. Beyond bone health, vitamin D3 supports immune system function, muscle strength, and may help reduce inflammation. It's also used for various conditions including high blood pressure, diabetes, and autoimmune diseases. The supplement comes in an easy-to-take soft gelatin capsule form. A 30-capsule pack provides a month's supply when taken as directed.