Provided is a novel method for improving the flavor of food, drink, a pharmaceutical product, an oral care product or the like. One embodiment of the present invention is a method for improving the flavor of food, drink, a pharmaceutical product or an oral care product, which comprises a step of adding 0.1-10,000 ppb of [gamma]-aminobutyric acid and 0.01-10,000 ppb of naringenin to the food, drink, pharmaceutical product or oral care product.