The explanation â the true one (if ever found) â does matter. It may matter to future whales, potentially, especially if we learn that 52 Hertz (âAliceâ, as in Cooper) got the way s/he did because of us, because of something we humans were/are doing.
Because of this health risk with high iron intake, the Institute of Medicine has set a Tolerable Upper Intake Level, or UL, for iron. This is the highest amount of iron that can be taken daily with a low risk for developing overload. For males and females over 14 years old, the UL for iron is 45 milligrams per day.
1 The U.S. RDA for iron is 27 mg per day for pregnant women and 9 - 10 mg for breastfeeding women.  Eating at least three servings of iron-rich foods a day will help ensure that you are getting 27 mg of iron in your daily diet.