vitamin B2 Riboflavin; involved in a wide range of oxidation reactions, of fats, carbohydrates, and amino acids. Deficiency impairs energy‐yielding metabolism and results in a set of symptoms known as ariboflavinosis: cracking of the skin at the corners of the mouth (angular stomatitis), fissuring of the lips (cheilosis), and tongue changes (glossitis); seborrhoeic accumulations appear round the nose and eyes.

Occurs mainly in yeast, liver, milk, eggs, cheese, and pulses; milk and milk products are the main source in most diets.

vitamin B2 See RIBOFLAVIN.