25 MG of Super-Bio Available Zinc Zinc is a mineral that is needed for healthy functioning of the body's immune system. Zinc supplementation has been shown to reduce the severity and duration of common cold symptoms. Zinc is not only necessary for healthy functioning of the body, but by bolstering the immune response, supplementation of zinc definitely reduces cold and flu symptom severity and duration. Zinc also helps the body process protein and promotes healthy cell reproduction and healthy human fertility