A milk enzyme-treated product, a production method thereof, a composition containing a pharmaceutical composition, and a product containing a pharmaceutical product are provided. A milk enzyme-treated product obtained by a method for producing a milk enzyme-treated product, comprising a step of bringing milk into contact with β-galactosidase.乳酵素処理物、その製造方法、医薬組成物を含むその組成物、および医薬品を含むその製品を提供する。乳をβ-ガラクトシダーゼと接触させる工程を含んでなる、乳酵素処理物の製造方法により得られる乳酵素処理物。