NADH (nicotinamide adenine dinucleotide hydrogen) is the active coenzyme form of vitamin B3. It plays an essential role in the energy production of every human cell. It is the primary carrier of electrons in transferring food from your diet into energy. This energy is stored as ATP (adenosine triphosphate), which provides the fuel for the mitochondria in each of your cells.

NADH plays a role in numerous biological reactions in the body. It repairs cell and DNA damage and stimulates your immune system. It boosts the production of nitric oxide, which relaxes blood vessels in your brain, increasing cerebral blood flow. NADH also acts as an antioxidant, helping to eliminate free radicals in your body, thereby boosting your immune system.