Iron Food supplement with Vitamin C, Copper, Folic acid and Vitamin B12. Iron contributes to the normal formation of red blood cells and hemoglobin, to the normal transport of oxygen in the body, to the normal function of the immune system, to the reduction of tiredness and fatigue. Vitamin C increases the absorption of iron, copper contributes to the normal transport of iron in the body, Folate contributes to normal hematopoiesis, vitamin B12 contributes to the normal function of red blood cells. Vitamin C, copper, folate and vitamin B12 also contribute to the normal function of the immune system.