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Almost two-thirds of the body’s iron is found in hemoglobin, the protein in red blood cells that carries oxygen to cells. A necessary trace element, iron is vital for producing ATP, the body’s primary energy source and providing extra fuel to muscles during exertion. Iron is an integral part of many proteins and several enzymes in the human physiology and is essential for the regulation of cell growth. Playing an important role in the production of DNA, energy and cognitive function, iron is required for the health of the immune system.