Alpha Lipoic Acid is a powerful antioxidant. It works synergistically with other antioxidants such as Vitamin E, C and glutathione.

Unlike other antioxidants, Alpha-Lipoic Acid is both fat and water soluble, enabling it to quench free radicals both inside the cells and outside. Alpha-Lipoic Acid also extends the life of other antioxidants, recharging them so that they can continue to protect the body.

Article: http://www.umm.edu/altmed/articles/alpha-lipoic-000285.htm