SmoothCaffeine™ is a special combination of caffeine and an amino acid from green tea called L-theanine. When combined, there is a synergistic effect that produces cognitive and mood benefits 1)Haskell, Kennedy, Milne, Wesnes & Scholey, Behav. Pharmacol. 16 Suppl. 1 A9, 2005.
Studies have shown that the combination enables faster simple reaction time, faster numeric working memory reaction time and improved sentence verification accuracy. It also increases alertness while at the same time decreasing tiredness and mental fatigue. 2)The effects of L-theanine, caffeine and their combination on cognition and mood.Haskell CF1, Kennedy DO, Milne AL, Wesnes KA, Scholey AB.
A randomized, double blind, placebo-controlled crossover study of 27 subjects on the effects of L-theanine and caffeine found that the combination improved speed and accuracy simultaneously on an attention-switching tasks and reduced the susceptibility to distracting information in a memory task. And the study concluded that “these data replicate previous results and provide further support for the existence of a synergistic relationship between effects of L-theanine and caffeine.” 3)Combined effects of L-theanine and caffeine on cognition and mood. H. PARNELL, G.N. OWEN, J.A. RYCROFT. Unilever R&D, Colworth House, Sharnbrook, Bedford, MK44 1LQ, UK doi:10.1016/j.appet.2006.07.051
Another study on young adults found that the combination of L-theanine and caffeine significantly improved accuracy during task switching and improved alertness while reducing tiredness. The results suggested that the l-theanine and caffeine combination “helps to focus attention during a demanding cognitive task.” 4)The combination of L-theanine and caffeine improves cognitive performance and increases subjective alertness. T. Giesbrecht1, J.A. Rycroft2, M.J. Rowson3, E.A. De Bruin1