Vitamin B2, also known as riboflavin, is a water-soluble B vitamin. The term ‘flavin’ originates from the Latin word ‘flavus’ referring to the yellow colour of this vitamin. Vitamin B2 is found in the human body primarily as an integral component of the coenzymes flavin adenine dinucleotide (FAD) and flavin mononucleotide (FMN) (1). Coenzymes derived from riboflavin are termed ‘flavocoenzymes’, and enzymes that use a flavocoenzyme are called ‘flavoproteins’ (2).