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L-theanine and caffeine improve task switching but not intersensory attention or subjective alertness

• Posted: 5 February 2010
• Categroy: Independent Research
• Download: 96 KB pdf

Tea ingredients L-theanine and caffeine have repeatedly been shown to deliver unique cognitive benefits when consumed in combination.

Suzanne J. L. Einöther, Vanessa E.G. Martens, Jane A. Rycroft, Eveline A. De Bruin

The current randomized, placebo-controlled, double-blind, cross-over study compared a combination of L-theanine (97mg) and caffeine (40mg) to a placebo on two attention tasks and a self-report questionnaire before, and 10 and 60 minutes after consumption. Thecombination of L-theanine and caffeine significantly improved attention on aswitch task as compared to the placebo, while subjective alertness and intersensory attention were not improved significantly. The results support previous evidence that L-theanine and caffeine in combination can improve attention.

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