Majid Koozehchian, M.S.Alpha lipoic acid (ALA), also called thioctic acid, is an antioxidant that is commonly used as a dietary supplement, particularly in the Unites States. A unique characteristic of ALA is that, unlike other antioxidants such as vitamins C (water soluble) and E (fat soluble), ALA functions in both watery and fatty tissue environments. Besides serving as an antioxidant itself, ALA also restores other oxidized forms of antioxidants including vitamins C and E to their active sta...