A purpose of the present invention is to provide: a composition for inhibiting carnosine dipeptidase, use of said composition for inhibiting carnosine dipeptidase, and a method for inhibiting carnosine dipeptidase. Another purpose of the present invention is to provide a composition that is biologically highly safe, and that is capable of enhancing the activity and effect of carnosine by using an inhibitory activity against carnosine dipeptidase. The present invention demonstrates the discovery of a predetermined compound such as a polyphenol or the like having an inhibitory activity against carnosine dipeptidase. The present invention provides a novel and effective means that contributes to the suppression of rising blood glucose levels, etc.
