Natural Theanine - 30 Capsules
relaxation without sedation

Ideal for


  • anybody looking to relax and unwind.

  • anybody looking to relax but maintain mental performance and clarity.

  • nervous public speakers and nervous travellers.

What is theanine?

our theanine is a natural isolated nutrient extracted green tea which increases the concentration of the chemical messenger; GABA.

GABA’s principle role in the brain is to relax the nervous system without sedation.

our Natural Theanine - 30 Capsules

our theanine is a natural isolated nutrient extracted green tea which increases the relative concentration of the chemical messenger; GABA. GABA’s principle role in the brain is to relax the nervous system without sedation.

most l-theanine is synthetic (e.g. Suntheanine) and it’s produced as a racemic using ethylamine and l-glutamine and a multi-stage synthesis. 

the theanine in our 250mg 99% capsules is extracted green tea from the mountainous region of Hunan Province in South Central China. We keep it as pure as possible so you won’t find additives such as lemon balm whose mechanism of action, ability to enter the brain or synergistic benefit is unknown.

theanine is a fast-acting, non-sedative relaxant which reduces the impact of excitatory pathways in the brain and in doing so it increases the relative GABA concentrations in the brain.

in human studies theanine also stimulates the production of alpha brain waves which is indicative of a relaxed but alert mental state [12]. It is often referred to as wakeful relaxation [13] exhibiting increased creativity and increased performance under stress as well as decreased anxiety [14].

in patient groups containing subjects with higher anxiety propensity symptoms, theanine has also been shown to reduce heart rate during stressful mental tasks. [15]

the relaxation effect of theanine leds to the increased GABA concentrations that result in general feelings of calm and wellbeing [6] however, unlike other conventional calming treatments, theanine does not result in increased drowsiness, slowed reflexes, or impaired concentration. [15]

it is absorbed into the bloodstream from the intestinal tract and enters the brain through the leucine-preferring amino acid transporter system [11].

brain levels increase 30 minutes after ingestion and peak at 5 hours. It does not accumulate in the body but is metabolized in the liver and completely eliminated in the urine within 24 hours [11].

1-2 per day

natural theanine (green tea isolate) 99%, vegetable cellulose capsule, bulking agent rice flour

Availability: In stock

£22.99 £22.99
Natural L-theanine
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relaxation without sedation

clinical data;

[1] Anna C Nobre et al L-theanine, a natural constituent in tea, and its effect on mental state Asia Pacific Journal Clinical Nutrition, 2008. - Vol. 17. - pp. 167-168. [2] Eschenauer et al Pharmacology and therapeutic uses of theanine American Journal Health-System Pharmacy,2006. - pp. 26–30. [3] Haskell et al Cognitive and mood effects of caffeine and theanine alone Journal of Behavioural Pharmacology, 2008. - 2 : Vol. 77. - pp. 113-122. [4] Higashiyama et al Effects of L-theanine on attention and reaction time response Journal of Functional Foods, 2011. - Vol. 3. - pp. 171-178. [5] Juneja et al Effects of L-theanine on the release of alpha brain waves in human volunteers Trends in Food Science & Tech, 1999. - Vol. 10. - pp. 199-204. [6] Juneja et al L-theanine - a unique amino acid of green tea and its relaxation effects in humans Trends in Food Science & Technology, 1999. - Vol. 10. - pp. 199-204. [7] Kakuda et al Inhibiting effects of theanine on caffeine stimulation evaluated by EEG : Bioscience Biotechnology and Biochemistry , 2000. - Vol. 64. - pp. 287–293. [8] Kakuda et al  Neuroprotective effects of the green tea components theanine and catechins [Journal]. - [s.l.] : Biological and Pharmaceutical Bulletin, 2002. - Vol. 25. - pp. 1513-1518. [9] Kenta Kimura et al L-Theanine reduces psychological and physiological stress responses Journal of Biological Psychology, 2007. - Vol. 74. - pp. 39-45. [10] Lovallo et al Cortisol responses to mental stress, exercise, and meals following caffeine intake in men and women Journal of Pharmacology Biochemistry and Behavior. - 2006. - pp. 441–447. [11] Lu et al The acute effects of L-theanine in comparison with alprazolam on anticipatory anxiety in humans [Journal]. - [s.l.] : Human  sychopharmacology, 2004. - Vol. 19. - pp. 457–465. [12] Micallef et al A double blind parallel group placebo controlled comparison of sedative and amnesic effects of etifoxine and lorazepam in healthy subjects Journal of Fundamental Clinical Pharmacology, 2001. - pp. 209–216. [13] Navarro et al Liver injury from herbal and dietary supplements Journal of Hepatology, 2017. - 1 : Vol. 65. [14] Ozeki et al A study of L-theanine and daytime drowsiness Japanese Journal of Physiological Anthropology, 2008. - Vol. 13. - pp. 9-15. [15] Song et al Effects of theanine on the release of brain alpha wave in adult males Korean Journal of Nutrition, 2003. - Vol. 36. - pp. 919–923.[16] Terashima et al Time-dependent changes of amino acids in the serum, liver, brain and urine of rats administered with theanine Journal of Bioscience, Biotechnology, and Biochemistry, 1999. - Vol. 63. - pp. 615-618. [17] Theertham et al In Search of a Safe Natural Sleep Aid Journal of the American College of Nutrition, 2015. - 5 : Vol. 34. - pp. 436-447. [18] Unno et al Metabolism of theanine, gamma-glutamylethylamide, in rats Journal of Agriculture & Food Chemistry, 1999. - Vol. 47. - pp. 1593-1596. [19] Yokogoshi et al Effect of theanine, r-glutamyethylamide, on brain monoamines and striatal dopamine release in conscious rats Journal Neurochemical Research, 1998. - Vol. 23. - pp. 667–673. [20] Bryan Janet Psychological effects of dietary components of tea: caffeine and L-theanine Journal of Nutrition Reviews, 2008. - 2 : Vol. 66. - pp. 82-90. [21] Toxicology Department of Pharmacology and A 13-week dietary toxicity and toxicokinetic study with theanine in rats Medical College of Virginia, Virginia Commonwealth University . 

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