Douglas Laboratories R-Lipoic Acid is a dietary supplement providing pure R-lipoic acid. A nutritional coenzyme, lipoic acid is involved in energy metabolism of proteins, fats, and carbohydrates as well as blood glucose disposal supporting normal transport of blood glucose into the cell. It also serves as a free radical scavenger protecting cells and tissues from their negative effects. Lipoic acid is soluble in both water and lipids, allowing it to neutralize free radicals both inside and outside the cells. Recommended use: Take 1 capsule daily with food or as directed by a healthcare professional.