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With too little or too much iron the end result is a disaster. Iron deficiency in pregnancy causes mental retardation and iron excess in adults predisposes to premature aging. Five percent of the population has the gene for iron overload.      

  According to a study in the July 2012 issue of the Canadian Medical Association Journal, iron supplementation reduced fatigue by about 50% in women with low iron but without anemia. When ferritin levels are below 50 and women with fatigue are supplemented with just 80 mg of iron per day over 12 weeks, their fatigue decreased and their iron levels increased...