PROBLEM TO BE SOLVED: To provide an agent that can promote a rise in amino acid concentrations in the blood of a subject.SOLUTION: An agent containing a hydrolysate of whey protein as an active ingredient is given to a subject for ingestion, which can promote a rise in amino acid concentrations in the blood of the subject.SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】対象の血中のアミノ酸濃度の上昇を促進できる血中アミノ酸濃度上昇促進剤を提供する。【解決手段】ホエイタンパク質の加水分解物を有効成分として、対象へ摂取させることにより、対象の血中のアミノ酸濃度の上昇を促進できる。【選択図】なし