Theanine - Uses, Side Effects, and More - WebMD

Egashira, N., Ishigami, N., Pu, F., Mishima, K., Iwasaki, K., Orito, K., Oishi, R., and Fujiwara, M. Theanine prevents memory impairment induced by repeated cerebral ischemia in rats. Phytother.Res ;22(1):65-68. View abstract.

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Giesbrecht, T., Rycroft, J. A., Rowson, M. J., and De Bruin, E. A. The combination of L-theanine and caffeine improves cognitive performance and increases subjective alertness. Nutr Neurosci. ;13(6):283-290. View abstract.

Haskell, C. F., Kennedy, D. O., Milne, A. L., Wesnes, K. A., and Scholey, A. B. The effects of L-theanine, caffeine and their combination on cognition and mood. Biol.Psychol. ;77(2):113-122. View abstract.

Kakuda, T. Neuroprotective effects of the green tea components theanine and catechins. Biol Pharm Bull ;25(12):-. View abstract.

Kakuda, T., Nozawa, A., Sugimoto, A., and Niino, H. Inhibition by theanine of binding of [3H]AMPA, [3H]kainate, and [3H]MDL 105,519 to glutamate receptors. Biosci.Biotechnol.Biochem. ;66(12):-. View abstract.

Kamath, A. B., Wang, L., Das, H., Li, L., Reinhold, V. N., and Bukowski, J. F. Antigens in tea-beverage prime human Vgamma 2Vdelta 2 T cells in vitro and in vivo for memory and nonmemory antibacterial cytokine responses. Proc Natl.Acad.Sci U.S.A 5-13-;100(10):-. View abstract.

Kimura, K., Ozeki, M., Juneja, L. R., and Ohira, H. L-Theanine reduces psychological and physiological stress responses. Biol Psychol. ;74(1):39-45. View abstract.

Matsumoto, K., Yamada, H., Takuma, N., Niino, H., and Sagesaka, Y. M. Effects of green tea catechins and theanine on preventing influenza infection among healthcare workers: a randomized controlled trial. BMC.Complement Altern.Med. ;11:15. View abstract.

Rogers, P. J., Smith, J. E., Heatherley, S. V., and Pleydell-Pearce, C. W. Time for tea: mood, blood pressure and cognitive performance effects of caffeine and theanine administered alone and together. Psychopharmacology (Berl) ;195(4):569-577. View abstract.

Sadzuka, Y., Sugiyama, T., Suzuki, T., and Sonobe, T. Enhancement of the activity of doxorubicin by inhibition of glutamate transporter. Toxicol.Lett 9-15-;123(2-3):159-167. View abstract.

Sugiyama, T. and Sadzuka, Y. Theanine and glutamate transporter inhibitors enhance the antitumor efficacy of chemotherapeutic agents. Biochim.Biophys.Acta 12-5-;(2):47-59. View abstract.

Sugiyama, T. and Sadzuka, Y. Theanine, a specific glutamate derivative in green tea, reduces the adverse reactions of doxorubicin by changing the glutathione level. Cancer Lett. 8-30-;212(2):177-184. View abstract.

Sugiyama, T., Sadzuka, Y., Nagasawa, K., Ohnishi, N., Yokoyama, T., and Sonobe, T. Membrane transport and antitumor activity of pirarubicin, and comparison with those of doxorubicin. Jpn J Cancer Res ;90(7):775-780. View abstract.

Terashima, T., Takido, J., and Yokogoshi, H. Time-dependent changes of amino acids in the serum, liver, brain and urine of rats administered with theanine. Biosci.Biotechnol.Biochem. ;63(4):615-618. View abstract.

Yang, Q. S., Xu, P. X., Li, Y. H., Jiang, S., Zhang, X., and Xue, M. [Effects of theanine and houpu extract in 7-day chick social separation-stress procedure]. Zhongguo Zhong.Yao Za Zhi. ;32(19):-. View abstract.

Yokogoshi, H., Kato, Y., Sagesaka, Y. M., Takihara-Matsuura, T., Kakuda, T., and Takeuchi, N. Reduction effect of theanine on blood pressure and brain 5-hydroxyindoles in spontaneously hypertensive rats. Biosci.Biotechnol.Biochem. ;59(4):615-618. View abstract.

Baba Y, Inagaki S, Nakagawa S, Kaneko T, Kobayashi M, Takihara T. Effects of l-Theanine on Cognitive Function in Middle-Aged and Older Subjects: A Randomized Placebo-Controlled Study. J Med Food ;24(4):333-341. View abstract.

Baba Y, Takihara T, Okamura N. Theanine maintains sleep quality in healthy young women by suppressing the increase in caffeine-induced wakefulness after sleep onset. Food Funct ;14(15):-. View abstract.

Brennan BP, Admon R, Perriello C, et al. Acute change in anterior cingulate cortex GABA, but not glutamine/glutamate, mediates antidepressant response to citalopram. Psychiatry Res Neuroimaging. Nov 30;269:9-16. View abstract.

Camfield DA, Stough C, Farrimond J, Scholey AB. Actue effects of tea constituents L-theanine, caffeine, and epigallocatechin gallate on cognitive function and mood: a systematic review and meta-analysis. Nutr Rev. ;72(8):507-522. View abstract.

Dassanayake TL, Wijesundara D, Kahathuduwa CN, Weerasinghe VS. Dose-response effect of L-theanine on psychomotor speed, sustained attention, and inhibitory control: a double-blind, placebo-controlled, crossover study. Nutr Neurosci . View abstract.

Dodd FL, Kennedy DO, Riby LM, Haskell-Ramsay CF. A double-blind, placebo-controlled study evaluating the effects of caffeine and L-theanine both alone and in combination on cerebral blood flow, cognition and mood. Psychopharmacology. ;232(14):-. View abstract.

Einöther SJ, Martens VE, Rycroft JA, De Bruin EA. L-theanine and caffeine improve task switching but not intersensory attention or subjective alertness. Appetite ;54(2):406-9. View abstract.

Evans M, McDonald AC, Xiong L, Crowley DC, Guthrie N. A Randomized, Triple-Blind, Placebo-Controlled, Crossover Study to Investigate the Efficacy of a Single Dose of AlphaWave(R) L-Theanine on Stress in a Healthy Adult Population. Neurol Ther ;10(2):-. View abstract.

Foxe JJ, et al. Assessing the effects of caffeine and theanine on the maintenance of vigilance during a sustained attention task. Neuropharmacology. ;62(7):-. View abstract.

Furushima D, Sugiyama I, Nomura Y, Unno K, Yamada H. Effect of Combined Ingestion of L-Theanine and L-Arginine for Short-Term Psychological Stress in Young Adults: A Randomized Placebo-Controlled Study. J Nutr Sci Vitaminol (Tokyo) ;68(6):540-546. View abstract.

Graham HN. Green tea composition, consumption, and polyphenol chemistry. Prev Med ;21:334-50. View abstract.

Hamaguchi R, Tsuchiya T, Miyata G, et al. Efficacy of oral administration of cystine and theanine in colorectal cancer patients undergoing capecitabine-based adjuvant chemotherapy after surgery: a multi-institutional, randomized, double-blinded, placebo-controlled, phase II trial (JORTC-CAM03). Support Care Cancer. . View abstract.

Hidese S, Ogawa S, Ota M, et al. Effects of L-theanine administration on stress-related symptoms and cognitive functions in healthy adults: A randomized controlled trial. Nutrients. ;11(10). pii: E. View abstract.

Hidese S, Ota M, Wakabayashi C, et al. Effects of chronic l-theanine administration in patients with major depressive disorder: an open-label study. Acta Neuropsychiatr ;29(2):72-9. View abstract.

Kahathuduwa CN, Dassanayake TL, Amarakoon AMT, Weerasinghe VS. effects of theanine, caffeine and theanine-caffeine combination on attention. Nutr Neurosci ;20(6):369-77. View abstract.

Kahathuduwa CN, Wakefield S, West BD, et al. Effects of L-theanine-caffeine combination on sustained attention and inhibitory control among children with ADHD: a proof-of-concept neuroimaging RCT. Sci Rep ;10(1):. View abstract.

Kakuda T, Nozawa A, Unno T, et al. Inhibiting effects of theanine on caffeine stimulation evaluated by EEG in the rat. Biosci Biotechnol Biochem ;64:287-93. View abstract.

Kakuda T, Yanase H, Utsunomiya K, et al. Protective effect of gamma-glutamylethylamide (theanine) on ischemic delayed neuronal death in gerbils. Neurosci Lett ;289:189-92. View abstract.

Kardashev A, Ratner Y, Ritsner MS.Add-on pregnenolone with L-theanine to antipsychotic therapy relieves negative and anxiety symptoms of schizophrenia: an 8-week, randomized, double-blind, placebo-controlled trial. Clin Schizophr Relat Psychoses. ;12(1):31-41. doi: 10./CSRP.KARA.. View abstract.

Kawada S, Kobayashi K, Ohtani M, Fukusaki C. Cystine and theanine supplementation restores high-intensity resistance exercise-induced attenuation of natural killer cell activity in well-trained men. J Strength Cond Res ;24(3):846-51. View abstract.

Kelly SP, Gomez-Ramirez M, Montesi JL, Foxe JJ. L-theanine and caffeine in combination affect human cognition as evidenced by oscillatory alpha-band activity and attention task performance. J Nutr ;138(8):S-S. View abstract.

Kimura R, Murata T. Effect of theanine on norepinephrine and serotonin levels in rat brain. Chem Pharm Bull ;34:-57.

Küçükibrahimoglu E, Saygin MZ, Caliskan M, Kaplan OK, Unsal C, Gören MZ. The change in plasma GABA, glutamine and glutamate levels in fluoxetine- or S-citalopram-treated female patients with major depression. Eur J Clin Pharmacol. Jun;65(6):571-7. doi: 10./s-009--7. View abstract.

Langan-Evans C, Hearris MA, Gallagher C, et al. Nutritional Modulation of Sleep Latency, Duration, and Efficiency: A Randomized, Repeated-Measures, Double-Blind Deception Study. Med Sci Sports Exerc ;55(2):289-300. View abstract.

Lin L, Zeng L, Liu A, et al. L-theanine regulates glucose, lipid, and protein metabolism via insulin and AMP-activated protein kinase signaling pathways. Food Funct. ;11(2):-. View abstract.

Lu K, Gray MA, Oliver C, et al. The acute effects of L-theanine in comparison with alprazolam on anticipatory anxiety in humans. Hum Psychopharmacol ;19:457-65. View abstract.

Lyon MR, Kapoor MP, Juneja LR. The effects of L-theanine (Suntheanine®) on objective sleep quality in boys with attention deficit hyperactivity disorder (ADHD): a randomized, double-blind, placebo-controlled clinical trial. Altern Med Rev. ;16(4):348-354. View abstract.

Maloh J, Chakkalakal M, Sulaiman F, Burney W, Chambers CJ, Sivamani RK. Combining Topical and Oral Botanicals for Skin Redness, Pigmentation, Sleep, and Mood: A Randomized Controlled Study. J Clin Med ;11(22):. View abstract.

Miodownik C, Maayan R, Ratner Y, et al. Serum levels of brain-derived neurotrophic factor and cortisol to sulfate of dehydroepiandrosterone molar ratio associated with clinical response to L-theanine as augmentation of antipsychotic therapy in schizophrenia and schizoaffective disorder patients. Clin Neuropharmacol ;34(4):155-60. View abstract.

Miyachi T, et al. Perioperative oral administration of cystine and theanine enhances recovery after distal gastrectomy: a prospective randomized trial. JPEN. ;37(3):384-391. View abstract.

Murakami S, Kurihara S, Koikawa N, et al. Effects of oral supplementation with cystine and theanine on the immune function of athletes in endurance exercise: randomized, double-blind, placebo-controlled trial. Biosci Biotechnol Biochem ;73(4):817-21. View abstract.

Nematizadeh M, Ghorbanzadeh H, Moghaddam HS, et al. L-theanine combination therapy with fluvoxamine in moderate-to-severe obsessive-compulsive disorder: A placebo-controlled, double-blind, randomized trial. Psychiatry Clin Neurosci ;77(9):478-485. View abstract.

Noah L, Morel V, Bertin C, et al. Effect of a Combination of Magnesium, B Vitamins, Rhodiola, and Green Tea (L-Theanine) on Chronically Stressed Healthy Individuals-A Randomized, Placebo-Controlled Study. Nutrients. Apr 29;14(9):. View abstract.

Okamoto H, Taniyama Y, Sakurai T, et al. Perioperative Administration of Cystine and Theanine Suppresses Inflammation and Facilitates Early Rehabilitation and Recovery after Esophagectomy: A Randomized, Double-Blind, Controlled Clinical Trial. Nutrients ;14(11):. View abstract.

Owen GN, Parnell H, De Bruin EA, Rycroft JA. The combined effects of L-theanine and caffeine on cognitive performance and mood. Nutr Neurosci ;11(4):193-8. View abstract.

Park SK, Jung IC, Lee WK, et al. A combination of green tea extract and l-theanine improves memory and attention in subjects with mild cognitive impairment: a double-blind placebo-controlled study. J Med Food ;14(4):334-43. View abstract.

Ritsner MS, Miodownik C, Ratner Y, et al. L-theanine relieves positive, activation, and anxiety symptoms in patients with schizophrenia and schizoaffective disorder: an 8-week, randomized, double-blind, placebo-controlled, 2-center study. J Clin Psychiatry ;72(1):34-42. View abstract.

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Rizzo R, Prato A, Scerbo M, Saia F, Barone R, Curatolo P. Use of Nutritional Supplements Based on L-Theanine and Vitamin B6 in Children with Tourette Syndrome, with Anxiety Disorders: A Pilot Study. Nutrients ;14(4):852. View abstract.

Sadzuka Y, Sugiyama T, Miyagishima A, et al. The effects of theanine, as a novel biochemical modulator, on the antitumor activity of adriamycin. Cancer Lett ;105:203-9. View abstract.

Sadzuka Y, Sugiyama T, Sonobe T. Efficacies of tea components on doxorubicin induced antitumor activity and reversal of multidrug resistance. Toxicol Lett ;114:155-62. View abstract.

Sadzuka Y, Sugiyama T, Sonobe T. Improvement of idarubicin induced antitumor activity and bone marrow suppression by theanine, a component of tea. Cancer Lett ;158:119-24. View abstract.

Sakato Y. The chemical constituents of tea: III. A new amide theanine. Nippon Nogei Kagakukaishi ;23:262-267.

Sarris J, Byrne GJ, Cribb L, et al. L-theanine in the adjunctive treatment of generalized anxiety disorder: a double-blind, randomized, placebo-controlled trial. J Psych Res ;110:31-7. View abstract.

Scheid L, et al. Kinetics of L-theanine uptake and metabolism in healthy participants are comparable after ingestion of L-theanin via capsules and green tea. J Nutr. ;142(12):-. View abstract.

Shamabadi A, Fattollahzadeh-Noor S, Fallahpour B, A Basti F, Khodaei Ardakani MR, Akhondzadeh S. L-Theanine adjunct to risperidone in the treatment of chronic schizophrenia inpatients: a randomized, double-blind, placebo-controlled clinical trial. Psychopharmacology (Berl) . View abstract.

Shamabadi A, Kafi F, Arab Bafrani M, Asadigandomani H, A Basti F, Akhondzadeh S. l-theanine adjunct to sertraline for major depressive disorder: A randomized, double-blind, placebo-controlled clinical trial. J Affect Disord ;333:38-43. View abstract.

Sugiyama T, Sadzuda Y. Enhancing effects of green tea components on the antitumor activity of adriamycin against M ovarian sarcoma. Cancer Lett ;133:19-26. View abstract.

Sugiyama T, Sadzuka Y, Tanaka K, Sonobe T. Inhibition of glutamate transporter by theanine enhances the therapeutic efficacy of doxorubicin. Toxicol Lett :121:89-96. View abstract.

Sugiyama T, Sadzuka Y. Combination of theanine with doxorobucin inhibits hepatic metastasis of M ovarian sarcoma. Clin Cancer Res ;5:413-6. View abstract.

Thiagarajah K, Chee HP, Sit NW. Effect of Alpha-S1-Casein Tryptic Hydrolysate and L-Theanine on Poor Sleep Quality: A Double Blind, Randomized Placebo-Controlled Crossover Trial. Nutrients ;14(3):652. View abstract.

Tsuchiya T, Honda H, Oikawa M, et al. Oral administration of the amino acids cystine and theanine attenuates the adverse events of S-1 adjuvant chemotherapy in gastrointestinal cancer patients. Int J Clin Oncol ;21(6):-90. View abstract.

Unno K, et al. Anti-stress effect of theanine on students during pharmacy practice: positive correlation among salivary a-amylase activity, trait anxiety and subjective stress. Pharmacol Biochem Behav. ;111:128-135. View abstract.

Williams J, Kellett J, Roach PD, et al. L-theanine as a functional food additive: its role in disease prevention and health promotion. Beverages ;2(2):13.

Williams J, McKune AJ, Georgousopoulou EN, et al. The effect of L-theanine incorporated in a functional food product (mango sorbet) on physiological responses in healthy males: a pilot randomised controlled trial. Foods ;9(3):371. View abstract.

Yokogoshi H, Kobayashi M. Hypotensive effect of gamma-glutamylethylamide in spontaneously hypertensive rats. Life Sci ;62:-8. View abstract.

Yokogoshi H, Mochizuki M, Saitoh K. Theanine-induced reduction of brain serotonin concentration in rats. Biosci Biotechnol Biochem ;62:816-7. View abstract.

Yokozawa T, Dong E. Influence of green tea and its three major components upon low-density lipoprotein oxidation. Exp Toxicol Pathol ;49:329-35. View abstract.

Yokozawa T, Oura H, Nakagawa H, et al. Effects of a component of green tea on the proliferation of vascular smooth muscle cells. Biosci Biotechnol Biochem ;59:-6. View abstract.

Yoto A, Motoki M, Murao S, Yokogoshi H. Effects of L-theanine or caffeine intake on changes in blood pressure under physical and psychological stresses. J Physiol Anthropol. ;31:28. View abstract.

Zheng G, Sayama K, Okubo T, et al. Anti-obesity effects of three major components of green tea, catechins, caffeine and theanine, in mice. In Vivo ;18:55-62. View abstract.

I often encourage my patients to drink tea. Black tea is a lower-caffeine alternative to coffee during the day, and decaffeinated tea can be a calming part of a nighttime power-down ritual before bed. Whatever time of day or night, drinking a cup of tea can be a soothing, relaxing ritual. I often drink tea myself—my favorite is my personal recipe for banana tea.

In addition to its calming qualities, tea also contains compounds that deliver some real health benefits. One of those compounds: L-theanine.

Fortunately, you can also get L-theanine in supplement form, which can help with relaxation, focus, and sleep. Let’s take a closer look at L-theanine and its calming, centering, sleep-boosting abilities.

What is L-theanine?

L-theanine is an amino acid that is found in tea leaves. It was identified in tea by Japanese scientists in . While tea is the most common dietary source for L-theanine, this compound is also found in some types of mushrooms. In foods, particularly green tea, L-theanine is thought to be a source of umami, the savory, brothy taste.

Scientists studying umami flavor have made some interesting discoveries. Umami has been linked to decreased risk for obesity. It may stimulate metabolism, boost sensations of fullness, and lengthen the time before hunger returns after eating.

There’s also evidence suggesting that L-theanine, when consumed in tea, may change taste perception, specifically diminishing the taste of bitterness in foods such as chocolate and grapefruit.

How L-theanine Works

L-theanine promotes relaxation and facilitates sleep by contributing to a number of changes in the brain:

• Boosts levels of GABA and other calming brain chemicals. L-theanine elevates levels of GABA, as well as serotonin and dopamine. These chemicals are known as neurotransmitters, and they work in the brain to regulate emotions, mood, concentration, alertness, and sleep, as well as appetite, energy, and other cognitive skills. Increasing levels of these calming brain chemicals promotes relaxation and can help with sleep.
• Lowers levels of “excitatory” brain chemicals. At the same time, it is increasing chemicals that promote feelings of calm, L-theanine also reduces levels of chemicals in the brain that are linked to stress and anxiety. This may also be a way that L-theanine can protect brain cells against stress and age-related damage.
• Enhances alpha brain waves. Alpha brain waves are associated with a state of “wakeful relaxation.” That’s the state of mind you experience when meditating, being creative, or letting your mind wander in daydreaming. Alpha waves are also present during REM sleep. L-theanine appears to trigger the release of alpha waves, which enhances relaxation, focus, and creativity. One of the appealing aspects of L-theanine is that it works to relax without sedating. That can make L-theanine a good choice for people who are looking to enhance their “wakeful relaxation,” without worrying about becoming sleepy and fatigued during the day.

Benefits of L-theanine

Improving sleep. With its ability to increase relaxation and lower stress, L-theanine can help in sleep in a number of ways. L-theanine may help people fall asleep more quickly and easily at bedtime, thanks to the relaxation boost it delivers. Research also shows L-theanine can improve the quality of sleep—not by acting as a sedative, but by lowering anxiety and promoting relaxation.

There’s evidence that L-theanine may help improve sleep quality in children with attention deficit hyperactivity disorder (ADHD). A study examined the effects on the sleep of boys ages 8-12, and found that the supplement worked safely and effectively to improve the quality of their sleep, helping them to sleep more soundly.

Reducing stress and anxiety. L-theanine is what’s known as an anxiolytic—it works to reduce anxiety. Some anxiolytics, such as valerian and hops, have sedative effects. L-theanine, on the other hand, promotes relaxation and stress reduction without sedating. L-theanine can help foster a state of calm, attentive wakefulness.

L-theanine has positive effects on both the mental and physical symptoms of stress, including lowering heart rate and blood pressure.

Research suggests that L-theanine can help reduce anxiety in people with schizophrenia and schizoaffective disorder.

Enhancing attention, focus, memory, and learning. Under stress, the body increases the production of certain hormones, including cortisol and corticosterone. These hormone changes inhibit some brain activity, including memory formation and spatial learning. L-theanine helps to lower levels of the stress hormone corticosterone and avoid interference with memory and learning.

L-theanine may help boost other cognitive skills. Research shows L-theanine can increase attention span and reaction time in people who are prone to anxiety. It may help improve accuracy—one study shows that taking L-theanine reduced the number of errors made in a test of attention.

Sometimes, L-theanine is used with caffeine to enhance cognitive skills. Studies show that combinations of L-theanine and caffeine can improve attention span, enhance the ability to process visual information, and increase accuracy when switching from one task to another.

Helping maintain a healthy weight. The anti-anxiety and sleep-promoting abilities of L-theanine may help people to maintain a healthy weight. After all, getting enough sleep and limiting stress are both key to sticking with a healthy diet and avoiding weight gain.

L-theanine may also play a more direct role in weight maintenance. There’s scientific evidence indicating L-theanine may help to limit fat accumulation and weight gain as well as protect against obesity.

What to Know

Always consult your doctor before you begin taking a supplement or make any changes to your existing medication and supplement routine. This is not medical advice, but it is information you can use as a conversation starter with your physician at your next appointment.

Dosing

The following doses are based on amounts that have been investigated in scientific studies. In general, it is recommended that users begin with the smallest suggested dose, and gradually increase until it has an effect.

• For sleep, stress, and other uses: 100 mg to 400 mg
• In combination with caffeine: 12-100 mg L-theanine, 30-100 mg caffeine

Possible Side Effects

L-theanine is generally well tolerated by healthy adults.

People in these groups should consult with a physician before using an L-theanine supplement:

• Pregnant women and those who are breastfeeding.
• Individuals with low blood pressure. L-theanine may lower blood pressure. If you have low blood pressure, speak with your doctor before beginning to use L-theanine.
• Children. Consult your child’s physician before beginning their use of L-theanine.

Interactions

The following medications and other supplements may interact with L-theanine. Effects may include increasing or decreasing sleepiness and drowsiness, interfering with the effectiveness of the medications or supplements, and interfering with the condition that is being treated by the medication or supplement. These are lists of commonly used medications and supplements that have scientifically identified interactions with L-theanine. People who take these or any other medications and supplements should consult with a physician before beginning to use L-theanine.

Interactions with medications

• Medications used to treat high blood pressure
• Stimulant medications

Interactions with other supplements

Supplements that contain caffeine. L-theanine may interrupt the stimulating effects of caffeine and herbs or supplements that contain caffeine. Some of these include:

• Coffee
• Black tea
• Oolong tea
• Guarana
• Mate
• Cola

Supplements that lower blood pressure. L-theanine may lower blood pressure, and combining this supplement with other blood-pressure-lowering supplements may cause blood pressure to drop too much. Some of these include:

• Andographis
• Casein peptides
• Cat’s claw
• Coenzyme Q-10
• Fish oil
• L-arginine
• Lycium
• Stinging nettle

People have relied on the stress-relieving, sleep-promoting powers of L-theanine for centuries, by drinking tea—especially green tea. You don’t have to be a tea drinker to benefit from the soothing properties of this ancient herb—and even if you already enjoy a regular cup of tea, you may find an L-theanine supplement helps with relaxation, stress, and sleep.

Sweet Dreams,

Michael J. Breus, PhD

If you are looking for more details, kindly visit L-Theanine for Nootropic.