NOW® Buffered Magnesium Ascorbate delivers high-powered antioxidant protection. This formula features a buffered (non-acidic) form of vitamin C that will not contribute to gastric irritation in acid-sensitive persons. Magnesium ascorbate is synthesized from a combination of ascorbic acid and magnesium to form magnesium ascorbate. Vegetarian/vegan product. Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish, tree nut or sesame ingredients.