L-theanine is an amino acid that is naturally found in tea leaves and is known to affect the neurotransmitters in the brain. It is thought to increase levels of dopamine and GABA, which can promote relaxation and reduce stress and anxiety, and also increase levels of serotonin, which can improve mood. L-theanine also reduces levels of cortisol, the stress hormone. Additionally, it can increase levels of N-acylethanolamines, which have anti-inflammatory effects in the brain.
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