* In Extra Virgin Olive Oil * Dietary Supplement Promotes: * Calcium and Bone Metabolism * Immune Function Jarrow Formulas Vitamin D3 Provides cholecalciferol, the most bioavailable form of vitamin D. Vitamin D3 is converted by the kidneys into the hormone calcitriol, the active form of vitamin D3. Vitamin D3 enhances calcium phosphorous absorption, stimulates the synthesis of osteocalcin (as important structural protein in bone), and is involved in proper cells differentiation and immune response.