Jarrow Formulas Vitamin D3, Supports Calcium and Bone Metabolism, Immune Function, 5000IU, 100 Softgels (Pack of 2)

Jarrow Formulas Vitamin D3 provides cholecalciferol, which is more biologically active than ergocalciferol (D2). Vitamin D3 is ultimately converted to its hormonally-active form, calcitriol, in the kidneys. Calcitriol enhances dietary calcium and phosphorous absorption, stimulates the synthesis of osteocalcin (an important structural protein in bone), and supports a healthy immune response.*