Vitamin B2, also known as riboflavin, slightly soluble in water, heating is stable in neutral or acidic solution. Part of the body yellow enzyme cofactor (yellow enzyme in the biological redox play the role of hydrogen delivery), when the lack of time, affecting the body's bio-oxidation, metabolism disorders. Lesions are sites of inflammation in the mouth, eyes and genitalia, so every day provided by the diet. The two properties of the vitamin B2 is the main reason for their losses: (1) light damage; (2) heating in alkaline solution can be destroyed.