For adults and children ages 14 and up, the upper limit - the highest dose that can be taken safely - is 45 mg a day. For example, 240 mg of ferrous gluconate contains just 27 mg of elemental iron, while 325 mg of ferrous fumarate contains 106 mg of elemental iron.įurthermore, what is the maximum amount of iron per day? Strict vegetarians may need to take in higher levels of iron. As noted above, 325 mg of ferrous sulfate contains just 65 mg of elemental iron. Similarly one may ask, is 65 mg of iron the same as 325 mg?įerrous sulfate is the form of iron that is best absorbed by the body. Although the traditional dosage of ferrous sulfate is 325 mg ( 65 mg of elemental iron) orally three times a day, lower doses (eg, 15-20 mg of elemental iron daily) may be as effective and cause fewer side effects.
