To what extent does the efficiency of lactase enzyme found in different types and brands of dietary supplements (VitaPlus Innolact lactase dietary supplement film-coated tablet, Millandjoy lactase enzyme chewable tablets, Lactase Comfort drops, Dr. Chen soft capsule, Sanct Bernhard lactase enzyme capsule) differ if the prescribed dosage used, measured as the amount of glucose produced after being treated with different supplements in a given time period (30sec, 60sec, 90sec, 120sec, 150sec)?