NAD+ is a coenzyme - found in every living cell, the nicotinamide adenine dinucleotide. It transforms all we eat into all we are and do. Just put, cells need energy. NAD+ helps cells build energy. The more NAD+ accessible, the more cells are required, and the better cells can operate. NAD+ supplements supply precursors to your body to make dinucleotide nicotinamide adenine or NAD. It is generally found as a positive ion; hence you will often see NAD as NAD+.