250% of iron is the upper limit of 45 mg

100% of iron RDA means 18 mg - that's what most women need. Some women need 27 mg - that's 150%. Many men though only need 8 mg, so that's achieved by a report of 45%. But the safe limit for adults is only 45 mg which is 250% of the 18 mg. So do not go over 250%. I looked back over 90 days and saw that I had around 260% twice - not safe.