The purpose of the present invention is to provide a composition for the improvement of intestinal tract barrier function with which it is possible to improve intestinal tract barrier function. The present invention pertains to a composition for the improvement of intestinal tract barrier function that includes, as an active ingredient, a flavan-3-ol polymer having a weight-average molecular weight of 4500-50,000.本發明之目的為提供可改善腸道屏障功能之腸道屏障功能改善用組成物。本發明係關於一種腸道屏障功能改善用組成物，其含有重量平均分子量為4500~50000的黃烷-3-醇聚合物作為有效成分。
