Magnesium is a master mineral that coordinates the proper function of nerves, muscle, blood vessels and bone. Seventy per cent of the body? Magnesium is stored in bones and teeth. As Magnesium helps to hold Calcium in our bones it may protect against Calcium build-up in arteries. Magnesium is vital to the functioning of muscles (including the heart), as well as to the transmission of nerve impulses and to brain function. Magnesium is also involved in many enzyme systems responsible for the metabolism of foods and the release of energy.