VLAARDINGEN, The Netherlands—A combination of L-theanine and caffeine can boost cognitive function and improve attention and alertness, according to a new study published in the journal Appetite.
A randomized, placebo-controlled, double-blind, crossover 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 minutes 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.
