Matcha has been used by the Zen Buddhist Monks for exactly these seemingly contradictory qualities. The timed release of energy by the caffeine and theophylline is at a rate that the body can deal with naturally (sustained 3-6 hours) while the powerful amino acid effect of the L-theanine relaxes and focusses. L-theanine encourages the transition from the beta brain waves of mental arousal to the alpha brain waves of relaxation. See more on L-theanine below.