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The National Institutes of Health (NIH) in the United States recommends that girls aged 14 to 18 consume 15 milligrams (mg) of iron per day, while the recommended daily amount of iron for boys in this age group is 11 mg. A lack of iron can lead to iron deficiency anemia, in which a person's blood lacks enough healthy blood cells, resulting in extreme fatigue, weakness, shortness of breath, and headache, among other symptoms. This statistic shows the recommended daily amounts of iron in the United States as of 2021, by gender and age.