Alpha Lipoic is a powerful antioxidant which works with other nutrients such as vitamins E, C and glutathione to defend against excessive free radicals. It is called a universal antioxidant because it is soluble in both water and lipid based tissue. Moreover, the body uses it in many other ways, including food metabolism and energy production. What makes Alpha Lipoic Acid so versatile is the two sulfur atoms that are part of each molecule.