Grains and greens in particular are good sources of manganese, which has properties beneficial to the formation of blood.
Manganese is present in extremely low concentrations in whole blood (7.7-12.1 ug/L) and serum (.38-1.1 ug/L). Red blood cells account for about 70% of the manganese in whole blood. There is also manganese-independent enzyme superoxide dismutase in white blood cells.
Formation of superoxide by such white blood cells as neutrophils and tissue scavenging macrophages is essential to their roles in protecting human.
In plasma, manganese is largely bound to gamma-globulin and albumin, with a small fraction of trivalent manganese bound to the iron-carrying protein, tranferrin.
Manganese in blood