A method for regulating hair growth is provided which comprises administering, to a subject in need thereof, dodecylcarbomoylmethyltrimethylammonium chloride and/or a compound of salt thereof selected from 2-dimethylamino-N-ethyl-acetamide, 2-dimethylamino-N-(2-{2-[2-(2-dimethylamino-acetylamino)-ethoxy]-ethoxy}-ethyl)-acetamide, 2-dimethylamino-N-[8-(2-dimethylamino-acetylamino)-octyl]-acetamide, 2-dimethylamino-N-[2-(2-{2-[2-(2-dimethylamino-acetylamino)-ethoxy]-ethoxy}-ethoxy)-ethyl]-acetamide, 2-dimethylamino-N-[12-(2-dimethylamino-acetylamino)-dodecyl]-acetamide, and 2-dimethylamino-N-[4-(2-dimethylamino-acetamino)-butyl]acetamide.
