One study published in the journal Beverages found that L-theanine could help decrease upper respiratory tract infections ( 6).Īnother one found that green tea catechins- antioxidants- and theanine could be effective at preventing the flu ( 7, 8).Īnother study found that L-theanine could help improve inflammation in the intestinal tract. Some research suggests that L-theanine may improve the function of the body’s immune system. The study’s participants also felt more alert and less tired in general.
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A typical cup of coffee contains 95 mg of caffeine ( 4, 5). Paired with caffeine, L-theanine may help increase focus and attention.Ī small study found that a combination of L-theanine (97 milligrams, or mg) and caffeine (40 mg) helped a group of young adults focus better during demanding tasks.
Researchers found that L-theanine decreased anxiety and improved symptoms ( 3).
In a review of five randomized controlled trials that included 104 participants, four trials linked L-theanine with reduced stress and anxiety in people experiencing stressful situations ( 2).Īnother study published in the Journal of Clinical Psychiatry focused on people living with schizophrenia or schizoaffective disorder. Sipping on a hot cup of tea can help you feel at ease, and research suggests that it not only relaxes the mind, but it also does so without causing drowsiness ( 1). Most known for helping people relax, L-theanine has other potential health benefits, including: Anxiety and stress relief
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