Iron

Iron is an essential mineral.  Iron is  necessary
for the transport of oxygen and for oxidation by
cells.  Deficiency of iron is a common cause of
anemia.  Food sources of iron include meat,
poultry, eggs, some vegetables and iron fortified
cereals. 
Try to choose foods with vitamin C to enhance
the absorption.  Try to avoid taking iron with
calcium, as the oxalates impair the absorption
of iron.