PROBLEM TO BE SOLVED: To provide a new agent that improves vitality and/or concentration.SOLUTION: The present invention provides a vitality and/or concentration improver comprising methylthioadenosine and/or salt thereof. The present invention provides a concentration improver in which a daily intake of methylthioadenosine and/or salt thereof is 0.01-1000 mg. The present invention provides a concentration improver in which a daily intake of the methylthioadenosine skeleton included in the methylthioadenosine and salt thereof is 1-10000 mg.COPYRIGHT: (C)2016,JPO&INPIT【課題】活力及び/又は集中力の向上を促す新たな剤を提供する。【解決手段】メチルチオアデノシン及び/又はその塩を含有する、活力及び/又は集中力向上剤。メチルチオアデノシン及び/又はその塩の一日摂取量が0.01~1000mgである集中力向上剤。メチルチオアデノシン及びその塩に含まれるメチルチオアデノシン骨格量の一日摂取量が1~10000mgである集中力向上剤。【選択図】なし
