According to the Food and Nutrition Information Center of the USDA, the Recommended Dietary Allowance (RDA) for iron is 8 mg per day for males ages 19 and older, 18 mg per day for women between the ages of 19 to 50, and 8 mg per day for women ages 51 and older. However, the RDA for iron in pregnant women is increased to 27 mg per day.What is the minimum daily requirement for iron?
Adult men require 8 milligrams of iron daily -- which is equivalent to 0.008 grams. Men should not take more than 45 milligrams, or 0.045 grams, of iron daily to limit their risks of developing iron toxicity. If you aren't able to get enough iron from your diet, your physician may recommend treatment with an iron supplement.