Vitamin B2 (chemical formula: C17H20N4O6, formula weight 376.37) is also called riboflavin, slightly soluble in water, and stable when heated in neutral or acidic solutions. It is a component of the prosthetic group of yellow enzymes in the body (yellow enzymes play a role of hydrogen transfer in biological redox). When lacking, it will affect the body's biological oxidation and cause metabolic disorders. Most of the lesions are inflammation of the mouth, eyes and external genitals, such as angular cheilitis, cheilitis, glossitis, conjunctivitis and scrotum, so this product can be used for the prevention and treatment of the above diseases. The storage of vitamin B2 in the body is very limited, so it must be provided by the diet every day.