Riboflavin is also known as vitamin B2. After being absorbed in food, vitamin B2 can be transformed into flavin mononucleotide and flavin adenine dinucleotide by the action of flavin kinase in the small intestinal mucosa to function. Riboflavin deficiency can lead to inflammation in the body, such as inflammation of the eyelids, inflammation of the lips, inflammation of the corners of the mouth, and even inflammation of the scrotum. The daily requirement of riboflavin for adults is 1.2-1.5 mg. Foods that contain riboflavin include the outer skin of plant seeds, germ and animal liver.