<Li> Key: AUNGANRZJHBGPY - SCRDCRAPSA - N </Li> <P> Riboflavin, also known as vitamin B, is a vitamin found in food and used as a dietary supplement . As a supplement it is used to prevent and treat riboflavin deficiency and prevent migraines . It may be given by mouth or injection . </P> <P> It is nearly always well tolerated . Normal doses are safe during pregnancy . Riboflavin is in the vitamin B group . It is required by the body for cellular respiration . Food sources include eggs, green vegetables, milk, and meat . </P> <P> Riboflavin was discovered in 1920, isolated in 1933, and first made in 1935 . It is on the World Health Organization's List of Essential Medicines, the most effective and safe medicines needed in a health system . Riboflavin is available as a generic medication and over the counter . In the United States a month of supplements costs less than 25 USD . Some countries require its addition to grains . </P>

Which category of food provides the most riboflavin