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L-Theanine, an amino acid which exists in Xerocomus badius (the mushroom), as well as in green tea. Its chemical structure is comparable to the neurotransmitters l-glutamine and l-glutamate. This property makes it a non-dietary food when consumed.

L-Theanine is able to easily transfer through the blood-brain barrier. Forms of consumption include supplements and green tea. The body begins to metabolize the substance 30-45 minutes after it is consumed.

As a Nootropic, L-Theanine assists:

  • Neurotransmitters – L-Theanine boosts the count of serotonin, GABA, and levels of dopamine inside the brain, which helps by creating a calming effect, while also calming the user making them feel more energized. Thereafter, these effects will increase the reliability of memory as well as cognition.
  • Neuroprotection – L-Theanine taken as nootropics are antagonists of the NMDA receptors of the brain, which induce the glutamate to be generated. This effect helps by protecting the brain from glutamate and glutamate overtoxication.  
  • Brain Waves – The nootropic allows alpha brain waves to establish relaxation, at times of stimulated stress. The nootropic also assists theta brain waves, which are associated with employing relief and creativity present post trauma.


L-Theanine is a non-dietary amino acid commonly present in green tea, as well as other teas but in lesserL-Theanine amounts. The nootropic was first extracted from green tea by Sakato in 1949, Japan. It is comparable to glutamine as well as glutamate, and very similar in the way it operates in the brain.

L-Theanine first gets metabolized by the liver, which turns it into ethylamine and L-glutamate. The newly metabolized elements are able to go through the blood-brain barrier without difficulty. L-Theanine when consumed as a nootropic, is unique in its ability to affect brain waves. This nootropic is able to impact alpha brain waves, mandated to aid relaxation and alert calmness.

This nootropic also aids the brain by encouraging the feeling of joy as well as very quick and efficient learning abilities. It aids in raising the levels of dopamine, serotonin, and GABA in the brain as well as also boosting the Nerve Growth Factor and the Brain-Derived Neurotrophic Factor. This drug is also known to help in improving cognition and cognitive functions, relieving stress, and increasing one’s mood.

L-Theanine To The Rescue

Taken as a nootropic, L-Theanine aids its users by giving them more energy without producing withdrawal effects thereafter. The nootropic also provides a calming effect without fatigue and loss of motivation. Given that green tea is a natural source of L-Theanine, it grants its users to consume coffee alongside, although caffeine does not act as quickly as L-Theanine.

The amino acid likewise benefits its users sleep cycle. Aside of supporting the quality of sleep, it also naturally supports the body when it is recovering from exhaustion, allowing it to feel replenished with energy. The nootropic gives its users a positive mood all through the day. Once it gets through the blood-brain barrier, it reinforces the function of neurotransmitters; hence boosting the person’s mood.

How Does L-Theanine Feel?

The functioning ability of brain waves, neurotransmitters, and other activity within the structure of the brain, are each crucial to the brain’s response to L-Theanine. Many users who actively seek to better their mental abilities, associate L-Theanine with creating a feeling of relaxation 30-45 minutes after consumption of the drug. At around that time, the L-Theanine begins to assist cognitive function, making its users feel more energetic, without the need of stimulants such as caffeine.

Users also reported that L-Theanine can drastically cutback the intensity and frequency of panic attacks as well as anxiety in general, however users are ill advised to mix L-Theanine with anti-anxiety medications, including but not limited to Xanax.

The nootropic has also been found to improve a sense of personal (particularly mental) fitness, further benefiting user’s quality of life and quality of rest at night.

The Research

Multiple instances of research were carried out in regards to the nootropics’ beneficial effects. Many of these were studies performed in Japan. In one particular instance, volunteers were given 200 mg of the substance, and their resting patterns were recorded. Thereafter, results concluded that the quality of rest had significantly improved within the volunteers, and they felt they were better able to recover from exhaustion.

The results of other research instances are indicated below:

Green Tea cuts back on the consequences of stroke.

Research performed in China regarding the influence of L-Theanine particularly on the cardiovascular L-Theaninesystem, demonstrates that if the substance is present in the blood at a time when a stroke occurs, the brain is able to instantly repair damage to the recently occured stroke, and the casualty recorded in the aftermath of the stroke was significantly reduced.

To further test how green tea affects people, researchers chose 12,212 candidates from a total of 12 different provinces, each volunteer aged 35-60 years old. They were asked for their current habits of drinking the tea, the concentration of the tea, as well as the particular type.

The study came to the conclusion that volunteers who regularly drank green, as well as black and jasmine tea, had a 40% contraction in experiencing a stroke later in their lives.

L-Theanine Helps In Improving Memory

Within a different placebo-like study, the aftermath of L-Theanine consumption was studied, and particularly its manipulation of memory. Within this study, 91 individuals were chosen particularly for their slight impairment in cognitive ability. Within the 91 people, half of them were given 1.68 grams of L-Theanine daily, for 112 consecutive days. The other half were given a pill with sucrose, in order to institute a placebo effect.

The study concluded that L-Theanine aided the function of theta waves within the brain, which are associated with cognitive function, particularly alertness and imagination. The research also showed positive development of recollecting ability, meanwhile advancing cognitive abilities.

L-Theanine Reduces Stress

Multiple experiments have been performed to see how L-Theanine emotionally affects mammals. It is no longer questioned whether L-Theanine downplays the effects of stress, particularly corticosterone levels, as both mammals and specifically humans have shown signs of stress relief, as well as improvement of the skill to recall past memories.

Corticosteroids are discharged when people go through stressful moments, which can greatly impact the development of memory.

Another investigation involving rodents was performed for 21 days. The rodents were given L-Theanine diluted in water. Thereafter, the rodents were forced to exercise, forcing their organisms to experience stress. The rodents which chose to drank the L-Theanine diluted water, had less corticosterone in their system.

Alongside the corticosterone levels, the investigation also concluded that the rodents which consumed the L-Theanine, were unaffected by the stress hormones released by their body, as the nootropic helped them keep it under control and carry on with the physical exercise. It was then concluded that L-Theanine aids mammals during times of stress, and is applicable for forbidding memory failure.

Dosage Notes

The correct dosage of consumption of L-Theanine is crucial, in order to observe its positive effects, and not develop physical dependance on the nootropic. The commonly endorsed dosage of L-Theanine is 200-400 mg once to twice daily. As per the recommendations of the Cleveland Wellness Clinic, the daily dosage should not exceed 1200 mg.

The substance is water soluble, meaning that it can be dissolved in and consumed with water.

Persons consuming this substance by drinking green tea should be aware of the amount of L-Theanine they are consuming. The label on green tea packaging usually only shows the number of green tea leaves included, and not the concentration of L-Theanine of each leaf.

A well processed cup of green tea will provide you with 1-2% of L-Theanine content in each serving. If this ratio is taken in mind, 1.5 grams of green tea leaves (assuming well saturated) will provide your body with 30 milligrams of L-Theanine. In either case, each person’s body will react to the substance differently, and you should personally begin with taking 100 milligrams of the substance daily, and after observing its effect on your body, raise the dosage steadily.

Side Effects

Thus far, no negative side effects have been determined in regards to using the substance, making L-Theanine one of the most trusted substances to be used in the form of supplements, and especially by consuming green tea. However, women who are pregnant or breastfeeding are not advised to use L-Theanine, and should limit the amount of green tea they drink. The stage of pregnancy as well as other health concerns should be brought up at a doctor’s office in order to determine their recommended maximum dosage. Over caffeination is a major concern for pregnant and breastfeeding women.

L-Theanine is a naturally occuring amino acid, which is derived from some species of mushrooms, as well as other plants used to make tea. Its derivation process and natural occurrence makes it a very safe and non-toxic substance to use. However, users should be aware that it lowers blood pressure when taken in large amounts, therefore users who take hypertension medication should be cautious when mixing both substances.

Available Forms

L-Theanine can be consumed with many different types of tea, including green, black, and white, although the biggest proportion of L-Theanine is in green tea.

Drinking green tea gives people seeking to better their mental wellbeing the additional benefit of inducing caffeine, since it is also present in green tea. A well brewed glass of green tea comes with L-Theanine alongside caffeine, however there is much less caffeine in green tea than in coffee.

Another available form of consumption is through something called a nootropic stack, in which users would take L-Theanine alongside other supplements which have different effects while increasing the potency of L-Theanine. The following are a list of recommended substances to be mixed with L-Theanine:

L-Theanine + Caffeine

An investigation was accomplished in Great Britain by the company Unilever regarding the effects of merging L-Theanine with foods containing caffeine, and their effects on the frame of mind as well as cognitive ability. Within the experiment, 27 volunteers were given 0.1 g of L-Theanine and 50 mg of caffeine. Based on how they interpreted visual instructions, word recalling, and their change in alertness and mood, the participants were tested initially, and then 60 minutes post consumption of the substances.

Each of the supplements were consumed separately, after a withdrawal session of one week. The experiment concluded that caffeine heightens the attention span of people after one hour of consumption, and their ability to focus was enhanced after one and a half hours. Although, when taken together, caffeine and L-Theanine are able to enhance the agility and accuracy of users currently doing work, while further lessening the susceptibility of disturbing information while performing memory related problems.

The investigative group determined that a combination of L-Theanine with caffeine was favorable when functioning efficiency and cognitive precision is of the essence.

It was also found that L-Theanine decreases the dependency a user will have on caffeine when taken together!

L-Theanine via Green Tea

Withdrawing L-THeanine from tea with accuracy requires precise knowledge in chemistry.L-Theanine

Scientists from the University of Newcastle, Australia, set forth the goal to determine the exact conditions required for filtering the substance from green tea. The scientists tried 4 diverse methods to determine the exact time, tea and water proportion, the temperature, and each time recorded the output of L-Theanine.

The scientists came to the conclusion that the optimal conditions for filtering the substance out of green tea was with a hot water to leaf proportion of 20:1 milliliter per gram, the temperature being eighty degrees Celsius, and left to brew for half an hour. Additionally, the green tea leaves should be at a diameter of half to one millimeter.

L-Theanine Supplements

If this precise process is not your prefered way of filtering L-Theanine from green tea, the substance is available as a supplement in the form of pills.

At the height of this market is a Japanese company titled “Taiyo.” Well known for the quality of its supplements, they established a technique for extracting L-Theanine out of green tea, known as “Suntheanine.”

This type of nootropic is often labeled in the market with the title “L-Theanine source” and sold in containers of powder. Very commonly, it will say Suntheanine on the label. If such is the case, it is commonly accepted that the declared amount of the substance will be accurate.

Some other supplement manufacturers attempt to develop a unique method for creating supplements with L-Theanine, however often they end up selling Theanine with the “D” prefix instead of “L”.

D-Theanine comes with different from L-Theanine side effects. The mix-up has not been found to be hazardous, however D-Theanine may not have the assets that one might look for in a clean form of L-Theanine.

If you are in seek of L-Theanine, performing research and checking the label is crucial to find the correct and desired product, as opposed to something that might not be as effective or applicable to personal needs.


The consumption of L-Theanine is highly advised, due to the fact that the human body is not able to produce this amino acid independently.

The substance is incredibly beneficial to people seeking to fight hypertension, excessive stress, while improving their capacity to pay attention to details, their reasoning potential, and brighten their mood. Individuals interested in discovering how exactly L-Theanine impacts their brain, have the choice of conducting an electroencephalogram, which will allow them to observe the change in how their brain reacts to and in different situations.

In essence, this amino acid is a natural solution to many common problems of adults, regardless of age and occupation. At the core of its operation, the substance directly cuts down on stress once it proceeds through the blood-brain barrier, increasing the amount of dopamine and serotonin in the brain.

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