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The amino acid stimulates the mind to produce alpha brain waves, the sign you’re deeply relaxed, and yet allows the brain to remain mentally alert. It also aids in the creation of GABA, gamma amino butyric acid, an inhibitory neurotransmitter responsible for influencing the levels of dopamine and serotonin. L-theanine has also been shown to reduce blood pressure in an animal model of hypertension. Further, it dampens the excitatory effects of caffeine, as measured by EEG and blood pressure.

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