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 as measured by ferritin levels, and hemoglobin levels increased as well.
Iron levels need to be just right; not too low and not too high. When they are too low, fatigue, anemia, and lack of normal amounts of energy ensue. When iron levels are too high, they feed cancer cells and bacteria and also increase the amount of free radical radicals, which makes us age much faster.