Vitamin K fulfills an important role in the utilization of calcium and prevention of osteoporosis through its effect on osteocalcin, which helps maintain calcium in bone, but at the same time keeps it out of soft tissue. While Vitamin D helps in the synthesis of osteocalcin, Vitamin K is required for it to function properly. Research has shown that Vitamin K and E help reduce calcification of arteries, however Vitamin K was additionally able to slow calcium loss in those with a tendency to lose it, and it better helped maintain bone density and prevent osteoporosis than Vitamin D and synthetic estrogen... Full Text