They must be taken daily. Minerals are natural substances found in the earth's crust. Minerals are found in a variety of foods. Two types of minerals Trace elements are needed only in small amounts. This group includes iron, copper, fluorine, iodine, selenium, zinc, chromium, cobalt, manganese and molybdenum.
Major elements are minerals that are needed in large quantities.
This group includes calcium, potassium, sodium, magnesium, phosphorus, chloride and sulfur. Water makes up about 50 to 60 percent of the body's weight. Every cell in the body must have water in order to survive. Experts recommend that people drink eight to ten glasses of water a day. The Guidelines Eat a variety of foods.