PROBLEM TO BE SOLVED: To provide a testosterone-5&alpha；-reductase inhibitor with a safe and natural product-derived substance as an active ingredient, a hair growing agent, a prostatic hyperplasia inhibitor and an anti-pimple agent, and a hair restoration method by oral intake of a safe and natural product-derived substance.SOLUTION: Provided are a testosterone-5&alpha；-reductase inhibitor with a benzophenone or a salt thereof as an active ingredient, a hair growing agent, a prostatic hyperplasia inhibitor and an anti-pimple agent, and a hair restoration method (except for medical practice on human) characterized by oral intake of a benzophenone or a salt thereof.【課題】安全で天然物由来の物質を有効成分とするテストステロン－5α－リダクターゼ阻害剤、育毛剤、前立腺肥大抑制剤、及び抗ニキビ剤、並びに安全で天然物由来の物質を経口摂取させることによる育毛方法を提供する。【解決手段】ベンゾフェノン類又はその塩を有効成分とするテストステロン－5α－リダクターゼ阻害剤、育毛剤、前立腺肥大抑制剤、及び抗ニキビ剤、並びにベンゾフェノン類又はその塩を経口的に摂取させることを特徴とする育毛方法(ヒトに対する医療行為を除く)。【選択図】なし
