Alpha-lipoic acid is a highly effective, biologically available, and well-researched antioxidant that works in both the fat-soluble and water-soluble portions of human cells.† Lipoic acid supports healthy liver structure, immune function, circulation, vision, and healthy glucose metabolism. It also supports cardiovascular and neurological health.† Being a powerful antioxidant, it protects cells and reduces damage caused by oxidation.† Lipoic acid also improves the effectiveness of vitamins C and E, two well-known antioxidants.