Iron is one of the more well known minerals. It is a component of red blood cells and assists in the transportation of oxygen throughout the body.
Iron deficiency causes anemia and it weakens the immune system.
Furthermore, iron deficiency slows you down physically and mentally, reduces bone density, and in women, can cause increased menstrual pain. Men generally don't need iron supplements because they get enough from meat, and too much is hard on the heart. Women, however, may need more, especially if they are pregnant, breast feeding, or menstruating. Athletes, children, and vegetarians may need iron supplements as well. It is for your doctor to decide.