Calcium is an essential mineral, supporting maintenance of normal bones and teeth as well as contributing to normal muscle function, neurotransmission and the function of digestive enzymes. Mostly found in dairy products, dietary calcium is also found in sardines, salmon, leafy vegetables and tofu. Magnesium plays a role in the reduction in tiredness and fatigue, the maintainance of electrolyte balance, normal functioning of the immune system, muscle function and protein synthesis as well as maintenance of normal bones and teeth. Nuts and grains and valuable sources of calcium as well as beans, dark green vegetables, fish and meat.