D-Galactose is a simple sugar, or monosaccharide, that is part of the carbohydrate family. It is commonly found in dairy products and is a component of lactose, the sugar present in milk. D-Galactose plays a crucial role in cellular processes and is important for energy production in the body. In addition to its presence in food, D-Galactose is involved in the synthesis of glycoproteins and glycolipids, which are essential for cell structure and function. It can be metabolized by the body to provide energy, and its levels are regulated to maintain proper physiological balance.