Method for the detection of a biochemical riboflavin deficiency. Stimulation of NADPH2-dependent glutathione reductase from human erythrocytes by FAD in vitro. Investigations on the vitamin B2 status in healthy people and geriatric patients. - Glatzle,G.; Korner,W.F.; Christeller,S.; Wiss,O. (Intern J Vit Res, 1970)