The combination of L-theanine and caffeine improves cognitive performance and increases subjective alertness.
Giesbrecht, T.; Rycroft, J.A.; Rowson, M.J.; De Bruin, E.A.; Nutritional Neuroscience, 2010, vol. 13, issue 6, p 283, ISSN 1028415x. ISBN 1028415x.

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