Flavin Mononucleotide (FMN) is a vital coenzyme derived from riboflavin (vitamin B2). It plays a crucial role in various biological processes, particularly in the electron transport chain, where it helps in the production of adenosine triphosphate (ATP), the energy currency of cells. FMN acts as a prosthetic group for several enzymes, facilitating redox reactions. In addition to its role in energy metabolism, FMN is involved in the metabolism of fats, carbohydrates, and proteins. It also contributes to the functioning of flavoproteins, which are proteins that contain a flavin group and are essential for numerous biochemical reactions in living organisms.