Alpha-Lipoic acid is a powerful fat- and water-soluble antioxidant. It directly recycles vitamin C and indirectly recycles vitamin E, providing additional antioxidant protection. It is also an important component in the energy production process in cells. alpha-Lipoic acid may support the normal insulin response and healthy blood sugar levels already within the normal range. Source Naturals Alpha Lipoic Acid Timed Release is designed to be released gradually throughout the day.