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Randomized Controlled Trial
, 54 (2), 406-9

L-theanine and Caffeine Improve Task Switching but Not Intersensory Attention or Subjective Alertness

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Randomized Controlled Trial

L-theanine and Caffeine Improve Task Switching but Not Intersensory Attention or Subjective Alertness

Suzanne J L Einöther et al. Appetite.

Abstract

Tea ingredients L-theanine and caffeine have repeatedly been shown to deliver unique cognitive benefits when consumed in combination. The current randomized, placebo-controlled, double-blind, cross-over study compared a combination of L-theanine (97 mg) and caffeine (40 mg) to a placebo on two attention tasks and a self-report questionnaire before, and 10 and 60 min after consumption. The combination of L-theanine and caffeine significantly improved attention on a switch 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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