PROBLEM TO BE SOLVED: To provide both a composition for improving mental concentration capable of suppressing psychological effects and/or physical effects caused by various factors during operation, learning, etc., and effectively and safely improving operating efficiency, learning efficiency, etc., and a method for improving the mental concentration.SOLUTION: This composition for improving the mental concentration is characterized as comprising theanine. The method for improving the mental concentration comprises administering the theanine to individuals.COPYRIGHT: (C)2003,JPO【課題】作業時や学習時等における種々の要因からくる心理的影響および/または身体的影響を抑制して、作業効率や学習効率等を効果的かつ安全に向上させることができる精神集中向上用組成物、ならびに精神集中の向上方法を提供すること。【解決手段】テアニンを含有することを特徴とする精神集中向上用組成物、ならびにテアニンを個体に投与する精神集中の向上方法。
