NADH, or nicotinamide adenine dinucleotide (NAD) + hydrogen (H), is a substance that the body naturally produces and contributes to energy production. Its properties are numerous, and its use is important, as by the age of 40 our body produces only 50% of NADH and by the age of 60 the minimum is 20%! Many consumers around the world use it as a "medicine", as many studies inform about its positive benefits regarding Alzheimer's disease, its powerful anti-aging effect, its benefits in improving memory and concentration, as well as in treating chronic fatigue.