B2 (riboflavin) a vitamin of the B complex that is a constituent of the coenzymes *FAD (flavine adenine dinucleotide) and *FMN (flavine mononucleotide). Riboflavin is therefore important in tissue respiration; it is also required to aid the absorption of iron. A deficiency of riboflavin causes a condition known as *ariboflavinosis, which is not usually serious. Good sources of riboflavin are liver, milk, and eggs. The adult RNI (see Dietary Reference Values) is 1.3–1.6 mg/day.... vitamin
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