Nicotinamide Mononucleotide (NMN) is a nucleotide derived from niacin, which plays a vital role in the production of NAD+ (Nicotinamide Adenine Dinucleotide). NAD+ is essential for numerous biological processes, including energy metabolism, DNA repair, and cellular communication. NMN is found naturally in small amounts in fruits and vegetables such as broccoli, cabbage, and avocado.