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 and phosphorus absorption, stimulates the synthesis of osteocalcin (an important structural protein in bone), and supports a healthy immune response.*

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.