Aside from iron, the body is typically free of metals and the iron that is in our bodies is not in pure form. It is primarily contained in complexes the body can use in the form of hemoglobin (active iron in red blood cells) and ferritin (storage form) and bound to other cellular proteins. Only in cases of iron overload do we get any precipitating iron and even that remains in the red blood cells. Even if the iron was not bound into other complexes, the small amount present in the human body would not result in magnetization. It is more the electrical components of our bodies, in the form of ions and electrolyte compounds, in addition to the water and general electrical charges of things like our cardiac and neurological systems that respond to the electricity around us.