Iron is an essential mineral and plays a key role in health. It is available as a dietary supplement, is an additive in some foods and also is abundantly and naturally present in many foods. An important component of hemoglobin, a protein molecule in red blood cells that carry oxygen, Iron is responsible for transferring oxygen from the lungs to all tissues throughout the body. It also plays a vital part in keeping the immune system healthy and supplying the body's energy. Maintaining the recommended daily allowance of iron is important to maintaining good health; the Food and Drug Administration (FDA) recommended daily allowance varies significantly with sex and age.

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