Provided is a stable and safe oral composition that acts on the barrier function of the skin to reduce and/or prevent skin roughness. An oral composition for reducing skin roughness and an oral composition for preventing skin roughness 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 skin roughness or the aforementioned oral composition for preventing skin roughness.
