NMN (nicotinamide mononucleotide) is a precursor to NAD+ (nicotinamide adenine dinucleotide), a coenzyme found in all living cells. Increased intracellular levels of NAD+ boost energy production and increase the rate of cellular repair. It’s a molecule that your body makes naturally, but gradually declines with age, making this a particularly useful product in those reaching an age where a natural decline in general function can occur, but also for everyone to ensure optimal levels are met.