Life Extension D-Ribose Powder Dietary Supplement. Helps Maintain Healthy Energy Levels in Heart & Muscle. D-ribose, a carbohydrate molecule found in every living organism, facilitates the production of ATP. D-Ribose powder can help speed energy recovery, increase energy reserves, and maintain healthy energy levels in heart and muscle tissue. Supplement Facts Serving Size 1 scoop (5000 mg) Servings Per Container approx. 30 Amount Per Serving Calories 30 Total Carbohydrates 5 g Sugars 5 g Bioenergy RIBOSE (Non-GMO D-Ribose) 5000 mg