NADH (Nicotinamide Adenine Dinucleotide Hydrate)? is a coenzyme involved in the manufacture of energy in the Krebs or citric acid cycle. NADH is an important electron carrier. Niacin (nicotinic acid) is converted to nicotinamide (niacinamide), which is converted in the body to NAD. When NAD+ picks up 2 hydrogen electrons it makes NADH. NADH has a special role in generating ATP (energy) through the oxidation of food molecules.