The study says that only the Fe(III) ions are harmful. Most iron that can be found in water or in food is in the form of Fe(II) ions, because all minerals that

The study says that only the Fe(III) ions are harmful. Most iron that can be found in water or in food is in the form of Fe(II) ions, because all minerals that contain Fe(III) ions are insoluble. The only components of food that are rich in Fe(III) are the hemoglobin from blood and the myoglobin from the "red" muscles, which are used by all vertebrates to transport or store oxygen.