NADH 10 mg Plus Ribose 200 mg, 60 Vcaps, NOW FoodsNOW Foods NADH 10 mg Dietary Supplement. Cellular Energy Production. Fights Fatigue. Supports Mental Alertness. With 200 mg D Ribose. NADH (Reduced Nicotinamide Adenine Dinucleotide), is the metabolically active form of Vitamin B 3, also known as Niacin. NADH is essential for the production of cellular energy (ATP) from glucose and fat. Therefore, the more NADH a cell has available, the more energy it has available to operate with optimal efficiency.