擴展閱讀: Effects of L-Theanine on the Release of Alpha-Brain Waves in Human Volunteers 1998日本研究 https://www.jstage.jst.go.jp/article/nogeikagaku1924/72/2/72_2_153/_pdf L-theanine—a unique amino acid of green tea and its relaxation effect in humans 1999年研究 http://www.ncbi.nlm.nih.gov/pubmed/17272967 2007年注意力研究 http://www.ncbi.nlm.nih.gov/pubmed/17904164 2007年小鼠神經元研究 http://www.ncbi.nlm.nih.gov/pubmed/17914132 2007年野茶樹預防流感研究 http://www.ncbi.nlm.nih.gov/pubmed/18296328 2008年年輕人研究 http://apjcn.nhri.org.tw/server/apjcn/17%20Suppl%201/167.pdf http://www.ncbi.nlm.nih.gov/pubmed/22214254 2011年注意力不集中症研究 Theanine - Scientific Review on Usage, Dosage, Side Effects
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In 2006, a study found no consistent, statistically significant treatment-related adverse effects on behavior, morbidity, mortality, body weight, food consumption and efficiency, clinical chemistry, hematology, or urinalysis in rats fed high doses of theanine for 13 weeks.[40] Large studies in humans have not been undertaken; however, several smaller-scale studies (fewer than 100 participants) have shown increased alpha wave generation and lowered anxiety, along with benefits to sleep quality in people with ADHD.[29][46][47] The combination of theanine and caffeine has been shown to promote faster simple reaction time, faster numeric working memory reaction time and improved sentence verification accuracy.[31][33][48][49] Due to this, the combination has become popular over recent years as a nootropic supplement typically found in the form of a pill, drink, or gum.[medical citation needed] Theanine may help the body"s immune response to infection by boosting the disease-fighting capacity of gamma delta T cells. The study, published in 2003, included a four-week trial with 11 coffee drinkers and 10 tea drinkers, who consumed 600 milliliters of coffee or black tea daily. Blood sample analysis found the production of antibacterial proteins was up to five times higher in the tea drinkers, an indicator of a stronger immune response.[50] L-Theanine may contain mast cell-stabilizing properties in an animal model.[51] Theanine has been reported to raise levels of brain serotonin, dopamine, and GABA, with possible improvement in specific memory and learning tasks.[52]
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