Jarrow Formulas, Vitamin D3, Cholecalciferol, 25 mcg (1,000 IU), 100 Softgels

Cholecalciferol In Extra Virgin Olive Oil Supports: Calcium and Bone Metabolism Promotes Immune Function Vitamin D3 1000 IU by Jarrow Formulas has been designed to increase your vitamin D levels. The active ingredient in each softgel capsule is vitamin D3, a highly absorbable form of the vitamin that may quickly boost your supply. Vitamin D3 is converted by the kidneys into the hormone calcitriol; the active form of vitamin D3. Calcitriol enhances calcium and phosphorous absorption; stimulates the synthesis of osteocalcin (an important structural protein in bone); and is involved in proper cell differentiation (changing of cell function); including in prostate cells and immune function.