Iron

Iron is a mineral that the body needs for growth and development. Your body uses iron to make hemoglobin, a protein in red blood cells that carries oxygen from the lungs to all parts of the body, and myoglobin, a protein that provides oxygen to muscles. Your body also needs iron to make some hormones. Low iron levels are common, and they can cause unpleasant symptoms like tiredness, poor concentration, and frequent bouts of illness.