Supports:.
* Jarrow FORMULAS Vitamin D3 is tested and verified to be free of vitamin A. Calcitriol enhances calcium and phosphorus 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. Jarrow Formulas Immune Support Vitamin D3 1000 mg - 100 Softgels Immune Function. Calcium and Bone Metabolism.