There are reports of iron overdosage in the United States under 6 years of age and this is one of the common death due to poisoning. The red blood cells have hemoglobin which is a protein carrying oxygen to the cells in the body. The body then needs iron to produce hemoglobin. If one does not have iron, the red blood cells will become pale and smaller thus they cannot carry oxygen enough in the body.
I believe it would be unrealistic goals, because then you would be pushing yourself harder when your body shouldnt be working that hard.
