Jarrow Formulas^® R-Alpha Lipoic Acid (Bio-Enhanced^® Na-RALA) exhibits high bioavailability and is the form of alpha lipoic acid that occurs naturally in plants, animals, and the human body. RALA functions as an antioxidant and is cofactor for energy production and glucose and lipid metabolism. d-Biotin prevents biotin deficiency from long-term alpha lipoic acid use.