It's the coenzyme "nicotinamide adenine dinucleotide (NAD)", which is at the origin of the production of ATP. It's present in two forms: "an oxidized form (NAD+) and a reduced form (NADH)".

NADH is known as the “Biological Rocket Fuel”, which helps to improve your daily energy levels by supplying energy to the brain, nerves, muscles, heart and all other organs in order for them to ...