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
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