The B vitamins are a group of 8 all water-soluble vitamins that play crucial roles in cell metabolism, energy production from food, the normal functioning of the central nervous system, and the formation of red blood cells. Riboflavin (B2) is a water-soluble vitamin that is essential for the metabolism of carbohydrates, fats, and proteins in the body. It is also important for maintaining healthy skin and eyes, and for producing energy from food.