Vitamin B2 also known as Riboflavin

Vitamin B2, also called riboflavin, is one of 8 B vitamins. B complex vitamins are necessary for healthy skin, hair, eyes, and liver. In addition to producing energy for the body, riboflavin also works as an antioxidant by fighting damaging particles in the body known as free radicals.
Riboflavin is also needed to help the body change vitamin B6 and folate into forms it can use. Vitamin B2, along with other nutrients, is important for normal vision. Some early evidence shows that riboflavin might help prevent cataracts. However, researchers don't know whether that was due to riboflavin, niacin, or the combination of the two. Vitamin B2 is destroyed by light, so food should be stored away from light to protect its riboflavin content.
Vitamin B2 is generally considered safe, even at high doses. However, because doses above 10 mg per day may cause eye damage from the sun, people who take high doses should wear sunglasses that protect their eyes from ultraviolet light. Vitamin B2 is manufactured in the body by the intestinal flora and is easily absorbed, although very small quantities are stored, so there is a constant need for this vitamin.
Vitamin B2, also known as food additives, aids in metabolizing respiratory proteins, fats, and carbohydrates. Riboflavin is helpful for maintaining the skin, nails, eyes, mouths, lips and tongue. It is important for normal vision and to prevent cataracts.

Others: Vitamin B6      Vitamin C