Researchers of one study in China found that women diagnosed with ovarian cancer who drank at least one cup of green tea a day lived longer than those who didn’t ( 13).Īnother study that looked at tea drinkers compared to nondrinkers found that women who drank green tea were 32 percent less likely to develop pancreatic cancer ( 14). Because of these promising findings, researchers expect that L-theanine could also help improve chemotherapy’s ability to fight cancer ( 10).Īlthough there’s no definitive evidence to show that tea prevents cancer, a number of studies suggest that people who regularly drink tea have lower rates of cancer ( 10, 11, 12). L-theanine has also been associated with amplifying the anti-tumor effects of certain chemotherapy drugs. However, more research is needed to confirm and expand on these findings ( 6, 9). 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. 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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