"Freedom is the oxygen of the  soul"  (Moshe Dayan 1915-1981)

Our normal cellular metabolic processes produce reactive oxygen species. These oxygen radicals attack and damage cellular  structures. To counteract this oxidative stress our cells have internal antioxidants such as enzymes catalase, glutathione peroxidase and superoxide dismutase. Trace elements (copper, iron, manganese, selenium, zinc) are integral parts of these antioxidant enzymes.