Vitamin B2, also called riboflavin, is one of eight vitamins in the B complex. All B vitamins help the body convert food (carbohydrates) into fuel (glucose), which is "burned" to produce energy. These B vitamins also help the body metabolize fats and protein. B complex vitamins are necessary for healthy skin, hair, eyes, and liver. They also help the nervous system function properly.* The B complex vitamins are water soluble, meaning the body does not store excess amounts, with the exception of vitamin B12, which is stored in the liver. Rather, unused B vitamins are excreted through urine. This means you need a continuous supply of the B vitamins from the diet.*