Vitamin B2, also known as riboflavin, is an essential nutrient found in many foods. It is a water-soluble vitamin that helps the body convert food into energy and is important for healthy skin, eyes, and hair. Riboflavin is also necessary for the proper functioning of the nervous system and for the production of red blood cells. It is found in dairy products, eggs, green vegetables, and fortified cereals. A deficiency of riboflavin can lead to anemia, skin disorders, and fatigue.