PURPOSE: An agent containing alpha-hydroxy acid(AHA) compounds with glycolic acid is provided to promote hair growth. CONSTITUTION: A composition for promoting hair growth contains 10 to 10^-12 M glycolic acid as an active ingredient. The composition for promoting hair growth contains 10 to 10^-12M lactic acid and 5 to 10^-12M trichloroacetic acid as active ingredients. A method for promoting hair growth comprises a step of treating a local part of human body with glycolic acid 4 days or more a week. A hair growing agent contains glycolic acid, lactic acid, or trichloroacetylic acid as an active ingredient.본 발명은 글리콜린산(glycolic acid)을 포함하는 알파 하이드록시산 (alpha-hydroxy acid, 일명 AHA)으로 알려진 화합물들을 유효성분으로 하는 모발성장 촉진제에 관한 것이다.