To provide a novel intestinal tract barrier improver.SOLUTION: An intestinal tract barrier improver that consists of one or more kinds of amino acid selected from the group consisting of D-aspartic acid, D-cysteine, D-glutamine, D-glutamic acid, and D-serine, or one or more kinds of component selected from the group consisting of mogroside V, humulone, 5,7-dimethoxy flavone, 5- hydroxy-7-methoxyflavone, 5-hydroxy-3,4',7-trimethoxyflavone, 5,7,4'-trimethoxyflavone, 5,7,3',4'-tetramethoxyflavone, and 3,5,7,3',4'-pentamethoxyflavone.SELECTED DRAWING: Figure 1

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