L-Theanine is an amino acid that is primarily found in tea leaves and is commonly used in dietary supplements. It was first isolated from green tea in 1949 by a team of Japanese scientists. L-Theanine is structurally similar to glutamate, an amino acid that is responsible for transmitting nerve impulses in the brain. This similarity allows L-Theanine to bind to glutamate receptors in the brain, leading to a variety of physiological effects.

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     L-Theanine is commonly used as a dietary supplement to promote relaxation and reduce stress and anxiety. Research has shown that L-Theanine can increase alpha brain waves, which are associated with relaxation and mental alertness. Additionally, L-Theanine has been found to increase the production of GABA, a neurotransmitter that is known for its calming effects. These effects make L-Theanine a popular supplement for those looking to reduce stress and anxiety without the sedative effects of traditional anti-anxiety medications.

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     L-Theanine is also commonly used in combination with caffeine. Studies have shown that the combination of L-Theanine and caffeine can improve cognitive performance, increase alertness and improve mood. This is because L-Theanine can counteract some of the negative side effects of caffeine, such as jitters and anxiety, while still providing a boost in energy and focus. Overall, L-Theanine is a popular dietary supplement that is valued for its ability to promote relaxation and reduce stress, while also improving cognitive performance and mood.