The present invention relates to an agent for promoting the production of ceramide covalently bonded to a horny cell, which contains a sphingolipid as an active ingredient. The present invention provides: a production promoter which can promote the production of ceramide covalently bonded to a horny cell, and which can safely, simply and economically prevent, inhibit or improve the deterioration of a barrier function of skin a composition and a food or beverage.本發明係有關於一種以神經鞘脂質為有效成分的角質層細胞共價鍵結神經醯胺之產生促進劑。根據本發明,可提供一種用以安全、簡易且經濟性地預防、抑制或改善皮膚之障壁機能的降低的促進角質層細胞共價鍵結神經醯胺之產生的產生促進劑、組成物、及食品飲料。
