An object of the present invention is to provide a hyaluronic acid production promoter which has no safety issues. Another object of the invention is to provide hyaluronic acid production promoting foods and beverages and hyaluronic acid production promoting cosmetics containing such a substance. A milk basic protein fraction and/or a milk basic protein fraction degradation product obtained by degrading a milk basic protein fraction using a protein degrading enzyme such as pepsin or pancreatin is used as an active ingredient of the hyaluronic acid production promoter, hyaluronic acid production promoting food or beverage, or hyaluronic acid production promoting cosmetic. This milk basic protein fraction or milk basic protein fraction degradation product has the effect of increasing the amount of hyaluronic acid.本發明之課題在於提供於安全性方面沒有問題的玻尿酸產生促進劑。又，本發明之課題在於提供摻合了如此的物質的玻尿酸產生促進用飲食品及玻尿酸產生促進用化妝料。係將乳鹼性蛋白質組份及/或乳鹼性蛋白質組份以胃蛋白酶或胰酶等蛋白質分解酵素分解而得之乳鹼性蛋白質組份分解物作為玻尿酸產生促進劑、玻尿酸產生促進用飲食品及玻尿酸產生促進用化妝料的有效成分。此乳鹼性蛋白質組份或鹼性蛋白質組份分解物有增加玻尿酸量的作用。
