Flavin Adenine Dinucleotide (FAD) is widely used in biochemical research as a coenzyme in redox reactions, playing a critical role in cellular energy production. It is essential in metabolic pathways such as the citric acid cycle and beta-oxidation of fatty acids, where it helps transfer electrons. FAD is also utilized in enzymatic assays to study the activity of flavoproteins and their involvement in oxidative processes. Additionally, it finds applications in the development of biosensors for detecting various biomolecules due to its redox-active properties. In the food industry, FAD is used to enhance the nutritional value of products, particularly in fortifying foods with essential vitamins. Its role in skin health has also led to its inclusion in cosmetic formulations aimed at improving skin vitality and reducing oxidative stress.