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Riboflavin is a water soluble B-vitamin which, in its coenzymatic forms flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD) is required for numerous oxidation/reduction reactions and plays an integral role in the metabolism of other B-vitamins and the related metabolite homocysteine. The objective of this study was to estimate the usual intake, prevalance of inadequate intakes, biochemical status and dietary sources of riboflavin in Irish adults using data from the National Adult Nutrition Survey (2008–2010)(www. iuna. net). A 4-day semi-weighed food record was used to collect food and beverage intake data from a representative sample of 1500 Irish adults (18–90 years). Dietary intake data was analysed using WISP© based on UK (1) and Irish (2) food compositon tables. Blood samples (n 1126) were collected, processed and analysed using stardard operating procedures. Usual intakes were …