Dietary supplement. Alpha lipoic acid is a powerful sulfur containing ingredients. It works synergistically with antioxidant Vitamins C & E and glutathione. Well tolerated by most highly allergic individuals. No corn, soy, yeast or egg products. No added sugars, salt (sodium), preservatives or tablet binders and coatings. This product is manufactured at our own state-of-the-art facilities with stringent quality control assuring correct potencies and outstanding product freshness. Packaged in a glass bottle for maximum stability, quality and freshness.