α-Glucosidase decomposes disaccharides into glucose, and increases blood glucose levels. Therefore, an increase in blood glucose can be suppressed by inhibiting the activity of α-Glucosidase. α-Glucosidase inhibitors have been discovered in various plants and their use is being explored for foods that will not cause an increase in blood glucose levels. This kit can, in combination with LabAssay™ Glucose (sold separately), measure the α-Glucosidase inhibitory effect of food products and the like.