Provided is a stable and safe oral composition that acts on the barrier function of the skin to reduce and/or prevent. An oral composition for reducing and an oral composition for preventing are provided, said compositions containing at least one compound selected from a group comprising D-glutamic acid and derivatives and/or salts thereof. Also provided are a pharmaceutical composition and/or a food composition containing the aforementioned oral composition for reducing or the aforementioned oral composition for preventing.本發明開發出一種穩定且安全之經口組合物，其可作用於皮膚屏障功能而減輕及/或預防肌膚粗糙。本發明提供一種減輕肌膚粗糙之經口組合物，其含有選自由D-麩胺酸與其衍生物及/或鹽所組成之群中之1種或2種以上之化合物。本發明提供一種預防肌膚粗糙之經口組合物，其含有選自由D-麩胺酸與其衍生物及/或鹽所組成之群中之1種或2種以上之化合物。本發明提供一種醫藥品組合物及/或食品組合物，其含有本發明之減輕肌膚粗糙之經口組合物或預防肌膚粗糙之經口組合物。
