Although oxidation reactions are crucial for life, they can also be damaging. Oxidation reactions can produce free radicals, which start chain reactions that damage cells. An antioxidant is a molecule capable of slowing or preventing the oxidation of other molecules. Low levels of antioxidants cause oxidative stress and may damage or kill cells. Diets high in fruit and vegetables, which are high in antioxidants, promote health and reduce the effects of aging. Antioxidant supplements can help prevent many diseases ( cancer, stroke and neurodegenerative diseases ). During exercise, oxygen consumption can increase vastly. This leads to a large increase in the production of oxidants and results in damage that contributes to muscular fatigue during and after exercise. Antioxidant substances include Vitamin C (Ascorbic acid), Vitamin E, Vitamin A, Glutathione, Lutein, Selenium, Beta Carotene, Lycopene, Lignan, Coenzyme Q10, Polyphenols.
