Natrol - Alpha Lipoic Acid Antioxidant Protection 600 mg. - 45 Tablets Natrol Alpha Lipoic Acid Antioxidant Protection 600 mg. is a powerful antioxidant that helps protect your cells from oxidative damage related to aging and environmental stress. ALA supplementation can support your energy metabolism and help rejuvenate your cells. ALA can also encourage glucose uptake by the body s cells.