Jarrow FORMULAS® Vitamin D3 (cholecalciferol) is derived from cod liver oil and sheep’s wool and is free of Vitamin A. Fat-soluble Vitamin D3 is converted by the kidneys into the hormone calcitriol, the active form of Vitamin D3, which affects a variety of target tissues, including bone, intestine, muscle, brain, skin and immune cells.* Calcitriol enhances calcium and phosphorous absorption and stimulates the synthesis of osteocalcin, an important structural protein in bone.* Also, calcitriol is involved in proper cell differentiation (changing of cell function), including in prostate cells.*
