The 5 Best L-Theanine Supplements of 2023, According to Experts

By Aaron L. Gravely, MD, July 14, 2023

“L-theanine has been shown to improve sleep quality not by being a sedative, but by reducing anxiety (i.e. by a calming, non-drowsy effect), which in turn promotes better sleep,” explains Dr. Alex Dimitriu, MD, a double board-certified physician in Psychiatry and Sleep Medicine and the founder of Menlo Park Psychiatry & Sleep Medicine. “It has been shown to increase the activity of alpha brain waves, which are associated with feelings of calm, creativity and improved focus. L-theanine is believed to work by calming the excitatory neurotransmitter, glutamate, while enhancing the activity of GABA—the major inhibitory neurotransmitter in the brain.”

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