About Alpha-Lipoic acid Naturally occurring dithiol compound , antioxidant, Agent for neuropathies. Mechanism of Action of Alpha-Lipoic acid Alpha-lipoic acid and its reduced metabolite, Dihydrolipoic acid (DHLA), form a redox couple and may scavenge a wide range of reactive oxygen species. Alpha-lipoic acid has been found to decrease urinary isoprostanes, O-LDL and plasma protein carbonyls, markers of oxidative stress. Further, alpha-lipoic acid and its redox couple DHLA have been found to have antioxidant activity in aqueous, as well as in lipophilic regions, and in extra cellular and intracellular environments. Alpha-lipoic acid participates in the recycling of other important biologic antioxidants, such as vitamins E and C, Ubiquinone and glutathione. Both alpha-lipoic acid and DHLA can scavenge hydroxyl radicals, the nitric oxide radical, peroxynitrite, hydrogen peroxide and hypochlorite. Alpha-lipoic acid may scavenge singlet oxygen, and DHLA may scavenge super oxide and per