Dietary Supplement D-RIBOSE is a naturally-occurring monosaccharide which is used by the body to synthesize nucleic acid, glycogen and other metabolic products. This physiologic agent is integral to ATP replenishment and has a direct effect on heart and skeletal muscle.*Serving Size:1 gServings Per Container:450Amount Per Serving Calories 4 Total Carbohydrate 1g Sugars 1g D-Ribose 1000mg Directions: Take one gram (1/4 tsp) three times daily, preferably before meals, or as directed by a physician.