Alpha-lipoic acid is an antioxidant that is made naturally in the body and found in foods. It is used to break down carbohydrates and to make energy. Alpha-lipoic acid can be eaten in foods, such as red meat, carrots, beets, spinach, broccoli, and potatoes. It is also available in supplements. Because alpha-lipoic acid seems to work like an antioxidant, it might provide protection to the brain. People most commonly use a -lipoic acid for nerve pain in people with diabetes. It is also used for obesity, altitude sickness, aging skin, high levels of cholesterol or other fats in the blood,...