The findings are in keeping with the known biological role of riboflavin in enhancing iron absorption and utilization [5], [30] (when riboflavin intake is high, the ability to mobilise iron from ferritin to and utilise it for the synthesis Hb will be high), and beneficial effects of riboflavin supplementation in the prevention of anemia in some [3], [31], but not all studies [3]. The gene discussed is GSTM1; the disease is anemia (phenotype).