L-Theanine is an amino acid derivative commonly found in green tea.[1]

It has psychoactive properties,[2] and is able to cross the blood-brain barrier.[3] Not only has L-Theanine been shown to reduce mental and physical stress,[4] it also improves cognition in a synergistic manner with caffeine.[5],[6]

A study done at Japanese university found L-Theanine facilitates relaxation, and may aid learning performance, mental clarity, and concentration.[7]

In a 2011 study of anxious students who received L-Theanine, they experienced a slowing of their heart rate, improved attention performance and better reaction times than those who received a placebo.[8]

In one study, the alpha brain waves of 13 people were monitored with electroencephalography (“EEG”), showed L-Theanine enhanced the processes responsible for maintaining attention.[2]

Another study examined the effects of as little as 50 milligrams of L-Theanine in healthy people. While relaxing with their eyes closed those receive L-Theanine showed increased alpha brain wave activity, indicating "a relaxed but alert mental state" compared with participants who did not receive L-Theanine.[9]

L-Theanine’s effect on sleep was demonstrated by giving a test group L-Theanine daily, then recording their sleep patterns. The study showed that while they did not sleep longer, the quality of sleep was more refreshing, and resulted in a better recovery of energy when they awoke. Those taking L-Theanine felt they slept longer than they actually did.[10]

Research has demonstrated L-Theanine provides a sense of relaxation in approximately 30-40 minutes after ingestion[11] via at least two different mechanisms. First, it directly stimulates the production of alpha brain waves,[12],[13] resulting in a state of deep relaxation and mental alertness similar to what is achieved through meditation. Second, L-Theanine is involved in the formation of the inhibitory neurotransmitter, gamma amino butyric acid (GABA),[14] which influences the levels of two other neurotransmitters, dopamine and serotonin, producing the key relaxation effect.[15]

Interestingly, L-Theanine may reduce the negative side effects of caffeine over-consumption.[16]

Each serving of Elebra contains L-Theanine, and is manufactured in the USA at a cGMP facility that has an "A" rating (the highest possible) from the National Nutritional Foods Association. We stand behind our product and offer a 100% Money Back Guarantee.

1. Juneja, LR; Chu, DC; Okubo, T; Nagato, Y; Yokogoshi, H. (1999). "L-Theanine - a unique amino acid of green
    tea and its relaxation effect in humans". Trends in Food Science & Technology 10 (2): 199–204.
2. Gomez-Ramirez, M., Kelly, S.P., Montesi, J.L., and Foxe, J.J. The effects of L-theanine on alpha-band
    oscillatory brain activity during a visuo-spatial attention task. Brain Topography, 2009, 22: 44-51.
3. Yokogoshi H, Kobayashi M, Mochizuki M, Terashima T (1998). "Effect of theanine, r-glutamylethylamide, on
    brain monoamines and striatal dopamine release in conscious rats". Neurochem Res 23 (5): 667–73.
4. Kimura K, Ozeki M, Juneja L, Ohira H (2007). "L-Theanine reduces psychological and physiological stress
    responses". Biol Psychol 74 (1): 39–45.
5. Haskell CF, Kennedy DO, Milne AL, Wesnes KA, Scholey AB (2008). "The effects of l-theanine, caffeine and
    their combination on cognition and mood". Biol Psychol 77(2): 113–22.
6. http://www.sciencenews.org/view/generic/id/8965/title/Distracted%3F_Tea_might_help_your_focus" John J.
    Foxe of the Nathan S. Kline Institute for Psychiatric Research in Orangeburg, N.Y., and his colleagues recruited
    16 people for tests of attentiveness on four days. Before testing, each individual drank a glass of water. On 3
    days, the drink was spiked with 100 milligrams of theanine, 60 mg of caffeine, or both. The theanine dose was
    equivalent to that in 4 to 5 cups of tea, and the caffeine translated to about 2.5 cups of tea. In the difficult tests,
    participants watched a computer screen and pressed a button when a designated shape appeared
    on the side of a busy visual field to which an arrow had previously pointed. Participants' accuracy differed little
    between days when they got water alone or with only one additive. Accuracy improved dramatically, however,
    on the day that they got the theanine-caffeine combination. The attention benefit lasted throughout the 3 hours
    of testing."
7. Terashima T. et al. Effect of Suntheanine Intake on Learning Ability. Fourth Shizuoka Forum on Health and
    Longevity. Nov 18, 1999 p.82-83. No abstract.
8. Higashiyama A, et al. Effects of L-theanine on attention and reaction time response. Journal of Functional
    Foods. Volume 3, Issue 3, July 2011, Pages 171-178.
9. Roan, Shari. “L-Theanine Comes into Focus.” Los Angeles Times 4 May 2010.
    http://articles.latimes.com/2009/may/04/health/he-theanine4. Retrieved 2011-10-05.
10. Green tea lulls brain into quality sleep. NutraIngredients.com. 17 March 2004.
11. Juneja LR, et al. L-theanine a unique amino acid of green tea and its relaxation effect in humans. Trends Food
    Sci Tech 1999; 10:199-204.
12. Ito K, et al. Effects of L-theanine on the release of alpha brain waves in human volunteers. Nippon
    Nogeikagaku Kaishi 1998;72:153-7. No abstract.
13. Gomez-Ramirez M; Higgins, BA; Rycroft, JA; Owen, GN; Mahoney, J; Shpaner, M; Foxe, JJ (2007). "The
    Deployment of Intersensory Selective Attention: A High-density Electrical Mapping Study of the Effects of
    Theanine". Clin Neuropharmacol 30 (1): 25-38.
14. Kakuda T, Nozawa A, Sugimoto A, Niino H. Inhibition by theanine of binding of [3H] AMPA, [3H] kainate, and
    [3H]MDL 105,519 to glutamate receptors. Biosci Biotechnol Biochem. 2002;66(12):2683-6.
15. Mason R. 200 mg of Zen; L-theanine boosts alpha waves, promotes alert relaxation. Alternative &
    Complementary Therapies 2001,April; 7:91-95
16. Kakuda T, Nozawa A, Unno T, et al. Inhibiting effects of theanine on caffeine stimulation evaluated by EEG in
    the rat. Biosci Biotechno Biochem 2000; 64:287-293.