Active Lipoic Acid combines R-Lipoic acid, the active R isomer, with alpha-lipoic acid for superior results! You get metabolic support for maintaining a healthy uptake and release of glucose to cells and help metabolizing carbohydrates after a meal. The sustained-release formula provides powerful, long-lasting antioxidant protection to guard cells from roaming free radicals. Last but not least, d-Biotin stabilizes the mix to ensure effective activity of the lipoic acid. Gluten free.