Minerals are needed for the growth and maintenance of the body structure. Calcium, magnesium, and phosphorus are essential for strong bones and teeth. In addition, calcium is necessary to produce scabs. Iron is an important part of red blood cells. Other minerals include iodine, potassium, sodium, and sulfur. Minerals help to regulate fluid balance, transport substances throughout the body, allow muscles to contract and nerves to transmit signals, and perform countless other functions. Like vitamins, minerals can perform their functions repeatedly and at a lightning speed.