L-theanine is a non-protein Amino Acid component, extracted from green tea. It can break through the blood-brain barrier and directly affect brain activity, which has an impact on people's emotions. It has a good effect on the human body in terms of neuroprotection, sedation, and regulation of emotions. In addition, theanine also enhances immunity and suppresses tumors. The results of the experiment showed that the amount of a wave in the experimenters who drank the theanine solution increased, and the generation of the a wave is a sign of a sense of comfort and pleasure in the human body. After the test, the subjects who took 200mg of theanine were asked, and half of them felt warm in the hands and toes, indicating that the end blood vessels were dilated; at the same time, they were relaxed, happy, comfortable and without anxiety. Japanese scholar Yokotsu (1997) et al. conducted experiments with rats as the research object, and the results proved that L-theanine is absorbed by the intestine and passed through the blood to the liver and brain. The brain can absorb L-theanine. The brain glands significantly increase the production of dopamine, a neurotransmitter in the brain.
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