Limidax XR
Camellia sinensis

Found in Limidax as: Green Tea Extract.

The Research and Science Behind Green Tea Extract

Updated on March 23, 2015

Green tea extract is derived from the leaves of the Camellia sinensis plant. We always prefer quality standardized extracts from natural sources instead of the cheap synthetic versions used by our competitors. The ingredient has a very successful track record of scientific and clinical studies showing that it may have health benefits from antioxidant benefits (due to polyphenols) to improving brain function. In fact, just recently (April 2014), new research and brain scanning from Switzerland has shown that Green Tea appears to boost memory by enhancing functional brain connectivity. This herbal supplement is in our study pill as a nootropic, because research has shown that it may boost brain function, focus, mental performance, brain plasticity, and stamina on demanding tasks.



Why Green Tea is our (Limidax) Instant Release Caffeine Proprietary Blend

Green tea contains more than just caffeine. It also has the amino acid L-theanine, which is able to cross the blood-brain barrier (see the study ). L-theanine increases the activity of the inhibitory neurotransmitter GABA, which has anti-anxiety effects. It also increases dopamine and the production of alpha waves in the brain. (see one study , and another , and a third different study ). Studies show that caffeine and L-theanine can also have synergistic effects, with the combination of the two being especially potent at improving brain function (see the study ). Furthermore, with L-theanine and the smaller dose of caffeine, green tea can give you a much milder and different kind of “buzz.”



Research Shows the Value of Green Tea Extract

There has been a lot of research focusing on green tea over the years. As a result, green tea extract’s powerful antioxidant status that boosts human health in general has become well-known. Drinking green tea has been found to reduce chronic inflammation, help to lower blood pressure, and generally improve blood flow. Studies also show that when people drink at least six cups of green tea every day, they have less chance of developing type 2 diabetes.



Green Tea Improves Working Memory

Green tea, like coffee, contains caffeine, but that’s not where it ends. It also contains an important amino acid, L-theanine (also known as theanine) that is known historically to work effectively as a calming agent.

Research on animals suggests that this substance (theanine) increases brain serotonin and dopamine, both of which are powerful neurotransmitters that occur naturally in our brains. The research also shows that it improves “object recognition memory.” Research on humans shows that theanine significantly affects mental alertness. It produces alpha waves in the brain, and this increased brain activity relaxes the mind without making us sleepy.

One of the most recent scientific studies aiming to prove that green tea extract boosts human brain power was carried out in Switzerland at the University of Basel. The results, published last year (2014), found that green tea was effective in improving “working memory.” It also suggests that green tea can be used successfully to treat a number of psychiatric disorders, including dementia.

In the study report titled Green tea extract enhances parieto-frontala connectivity during working memory processing, it was stated that green tea extract increases “the brain’s effective connectivity.” This refers to the “causal influence” of one part of the brain over another part of the brain.

Researchers reported that this effect on the brain’s connectivity had also improved the actual cognitive performance of the people tested. More simply, it resulted in a notable improvement in the tasks that volunteers in the study were asked to perform.

In their conclusion, the authors of the research report stated that their findings provided “first evidence for the putative beneficial effect of green tea on cognitive functioning.”

One of the most important clinical implications of these findings was that green tea could perhaps potentially be used effectively to treat “cognitive impairments” in certain neuropsychiatric disorders including dementia.

In another even more recent study, published in February 2015, it was found that alpha, theta and beta wave activities in the brain increased within an hour after volunteers had drunk green (or black) tea. The study that examined the effect of both green and black tea consumption in relation to brain wave activity, looked at several psychosomatic states that can be measured in the brain including:

  • Attention enhancement
  • Mind clarity
  • Relaxation

Researchers, who used simplified Electoencphalograms (EEGs) to measure brainwaves, found that volunteers were considerably more alert and attentive about half an hour after drinking green tea. This backs up previous studies.



Drinking Green Tea Versus Taking a Supplement

In the Green Tea Extract Enhances Parieto-Frontal Connectivity study referenced on this page (with link to study), researchers concluded that their finding provided "evidence for the putative beneficial effect of green tea on cognitive functioning, in particular, on working memory processing." The researchers recommended Green Tea Extract taken from a supplement as a result.



  1. Please read the research for yourself: Green tea extract enhances parieto-frontal connectivity during working memory processing. Authors: Schmidt A, Hammann F, Wölnerhanssen B, Meyer-Gerspach AC, Drewe J, Beglinger C, Borgwardt S. The Direct Link to the Study is: http://www.ncbi.nlm.nih.gov/pubmed/24643507
    Any questions? Our neuroscientists are ready to answer your questions. Reach out to us: support@limidax.com

  2. Please read the research for yourself: Advantageous effect of theanine intake on cognition. Authors: Tamano H, Fukura K, Suzuki M, Sakamoto K, Yokogoshi H, Takeda A. The Direct Link to the Study is: http://www.ncbi.nlm.nih.gov/pubmed/24621060
    Any questions? Our neuroscientists are ready to answer your questions. Reach out to us: support@limidax.com

  3. Please read the research for yourself: L-theanine—a unique amino acid of green tea and its relaxation effect in Humans. Authors: Lekh Raj Juneja, Djong-Chi Chu, Tsutomu Okubo, Yukiko Nagato, Hidehiko Yokogoshi. The Direct Link to the Study is: http://www.sciencedirect.com/science/article/pii/S0924224499000448
    Any questions? Our neuroscientists are ready to answer your questions. Reach out to us: support@limidax.com

  4. Please read the research for yourself: The neuropharmacology of L-theanine(N-ethyl-L-glutamine): a possible neuroprotective and cognitive enhancing agent. Authors: Nathan PJ1, Lu K, Gray M, Oliver C. The Direct Link to the Study is: http://www.ncbi.nlm.nih.gov/pubmed/17182482
    Any questions? Our neuroscientists are ready to answer your questions. Reach out to us: support@limidax.com

  5. Please read the research for yourself: L-theanine, a natural constituent in tea, and its effect on mental state. Authors: Nobre AC, Rao A, Owen GN. The Direct Link to the Study is: http://www.ncbi.nlm.nih.gov/pubmed/18296328
    Any questions? Our neuroscientists are ready to answer your questions. Reach out to us: support@limidax.com

  6. Please read the research for yourself: Involvement of GABA[A] Receptors in the Neuroprotective Effect of Theanine on Focal Cerebral Ischemia in mice. Authors: Nobuaki Egashira, Kazuhide Hayakawa, Megumi Osajima, Kenichi Mishima, Katsunori Iwasaki, Ryozo Oishi, Michihiro Fujiwara. The Direct Link to the Study is: https://www.jstage.jst.go.jp/article/jphs/105/2/105_2_211/_article
    Any questions? Our neuroscientists are ready to answer your questions. Reach out to us: support@limidax.com

  7. Please read the research for yourself: L-Theanine and Caffeine in Combination Affect Human Cognition as Evidenced by Oscillatory alpha-Band Activity and Attention Task Performance. Authors: Simon P. Kelly, Manuel Gomez-Ramirez, Jennifer L. Montesi, and John J. Foxe. The Direct Link to the Study is: http://jn.nutrition.org/content/138/8/1572S.long
    Any questions? Our neuroscientists are ready to answer your questions. Reach out to us: support@limidax.com



Green Tea Extract Enhances Parieto-Frontal Connectivity

This study investigated whether the intake of green tea extract modulates effective brain connectivity during working memory processing and whether connectivity parameters are related to task performance. Using a double-blind, counterbalanced, within-subject design, 12 healthy volunteers received green tea extract. Green tea extract increased the working memory induced modulation of connectivity from the right superior parietal lobule to the middle frontal gyrus. The Scientists concluded that their finding provided "evidence for the putative beneficial effect of green tea on cognitive functioning, in particular, on working memory processing." You can read the full study yourself through The U.S. National Library of Medicine

Advantageous Effect on Theanine Intake on Cognition

Theanine is one of the major amino acid components in green tea. Object recognition memory was maintained in theanine-administered rats 48 hours after the training, but not in the control rats. When in vivo dentate gyrus long-term potentiation (LTP) was induced, it was more greatly induced in theanine-administered rats than in the control rats. The levels of brain-derived neurotropic factor and nerve growth factor in the hippocampus were significantly higher in theanine-administered rats than in the control. You can read the full study yourself through The U.S. National Library of Medicine