Riboflavin provides 400 mg of riboflavin, also known as vitamin B2, per vegetarian capsule. Riboflavin is important for healthy growth and development and normal red blood cell production. It also assists in the process of releasing energy from carbohydrates. Riboflavin is a water-soluble B vitamin that must be replenished by dietary sources daily in order to maintain adequate levels to support normal function and health.