Many Canadians are plagued by a lack of calcium in their bones (osteoporosis) yet suffer from excess calcium in their arteries (atherosclerosis). This is known as the â€œcalcium paradoxâ€. Medical research has established the connection between these two health conditions. Vitamin K is a group of fat-soluble vitamins long known for their role in blood clotting and for reduction of heavy bleeding during menstruation, bruising and nosebleeds. Clinical studies show that vitamin K deficiency in bone and in blood vessels exists in many healthy adults. This vitaminâ€™s most important function, it has a critical role in the development of bones, acting as a regulator of calcium to the tissues.