Quick Overview
Jarrow Vitamin D3 contains cholecalciferol, a highly bioavailable form of vitamin D3, which supports skeletal health by improving calcium and phosphorous absorption, stimulating osteocalcin production, and regulating cell differentiation and immune response. The kidneys convert vitamin D3 into calcitrol, a hormone that is an active form of vitamin D3. This important vitamin supports bone strength, structure, and health.