Val professional acid or that pharmacy it includes the approved possible salt as the active ingredient the composition for dehairing prevention or growth hair promotion is offered. The aforementioned composition is application possible variously in pharmacy, the cosmetics and beauty care field etc.< Selective figure >Figure 4バルプロ酸又はその薬学的に許容可能な塩を有効成分として含む、脱毛防止又は育毛促進のための組成物を提供する。前記組成物は、薬学、化粧品、美容分野等において多様に活用可能である。【選択図】図4