Elderly people in the US may be taking unnecessary and possibly harmful iron supplements, according to a recent study. Researchers at the US Department of Agriculture human nutrition research center on aging at Tufts University inBoston looked at the data from approximately 1,000 elderly Americans from the Framingham Heart Study. They found that 16 per cent were taking supplements containing iron, and their average consumption was about 30 mg per day. Three per cent of people had too little iron, while about 13 per cent had too much. Full findings are published in the March issue of the American Journal of Clinical Nutrition.