“L-theanine increases GABA, serotonin and dopamine. These chemicals are neurotransmitters and do all sorts of things like regulating emotions, mood, concentration, alertness, energy, appetite and sleep. So regardless if your trying to concentrate or just relax, increasing these chemicals will help with anxiety. At the same time, L-theanine reduces chemicals in the brain that are linked to stress and anxiety.
L-theanine also appears to trigger the release of alpha-waves, which is that state of mind when you are meditating, being creative or just in deep thought. It’s no wonder buddhist monks have been using tea for centuries to meditate without getting sedated.
L-theanine also reduces heart rate and blood pressure, another symptom of stress.
WHICH TEAS CONTAIN THE MOST L-THEANINE? Generally green tea contains more L-theanine than other types, but all types other than Pu-erh have some amounts of L-theanine”