Source Naturals NADH delivers 10 mg of this versatile nutrient per tablet. A natural coenzyme derived from vitamin B-3, NADH plays a role in many crucial functions in the body, including basic metabolism, respiratory function, and the breakdown of sugars and fats. Contains no yeast, dairy, egg, gluten, corn, soy, wheat, sugar, starch, preservatives, artificial color, flavor or fragrance.