Accuracy you can trust. For blood glucose testing with OneTouch Verio Family of Meters. Reagent composition: Each test strip contains: flavin adenine dinucleotide dependent glucose dehydrogenase or FAD-GDH (from aspergillus sp.) - 2 U; potassium ferricyanide 41 ug; and other ingredients (buffer, etc.). The vial contains a drying agent. (4 vials of 25).