The present invention addresses the problem of providing, for the purpose of symptomatic improvement of dry skin, dry eye, dry mouth, etc., an external secretagogue that promotes external secretions in a comprehensive manner and that can be utilized as a food composition, and more specifically, providing an agent that increases the moisture content of the horny cell layer, a saliva secretagogue, and a tear fluid secretagogue. Provided is an external secretagogue including a compound represented by a general formula (1) as an effective component. More specifically, provided is an agent that increases the moisture content in the horny cell layer, a saliva secretagogue, or a tear fluid secretagogue. (In general formula (1): R1-R4, R6 and R7 each denote a hydrogen atom or the like； R5 denotes a hydroxyl group or the like； and * denotes an asymmetric carbon atom.).本發明的課題在於，為了改善皮膚乾燥、眼乾或口乾等症狀而提供一種總括地促進外分泌、且可用作食品組成物的外分泌促進劑，更詳細而言，提供一種角質層水分量增加劑、唾液分泌促進劑、以及淚液分泌促進劑，本發明為一種將下述通式（1）所表示的化合物作為有效成分的外分泌促進劑，更詳細而言為角質層水分量增加劑、唾液分泌促進劑、或淚液分泌促進劑。（通式（1）中，R1～R4、R6及R7表示氫原子等。R5表示羥基等。*表示不對稱碳原子）
