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The amount of theanine and the molar ratio of caffeine and EGCG to theanine and Arg in (a) 76 samples of matcha marketed in Japan and (b) 67 samples of matcha marketed overseas. Based on data in humans, samples in the section, theanine > 17 mg/g, and molar ratio of caffeine and EGCG to theanine and Arg < 2 are expected to show a stress-reducing effect.
