Haemochromatosis, aka iron overload, is a genetic disorder that causes a toxic build up of iron in the blood, leading to disease and death if not treated. The treatment is simple, phlebotomy or bleeding.
My mother learned of her haemochromatosis too late. She died of liver failure. Of course, this means I'm heterozygous in the mutation. I have had elevated iron levels, addressed by donating blood. I've also had a heart attack. Have no idea if they are related.
If you are concerned about iron uptake, you can do a few simple things: reduce alcohol intake, reduce vitamin C intake and drink more tea
Don't know about any relationship with free radical formation.