Supports healthy bones and immune function Promotes heart health 2,000 IU of vitamin D3 per soft gel Potency and quality guaranteed Carlson Vitamin D3 2,000 IU is the preferred form of vitamin D that’s important for promoting strong bones and supporting immune system and heart health. Higher levels of vitamin D3 in the blood are associated with strong bones and good health, as well as a strong immune system. Each soft gel provides 2,000 IU of vitamin D3.