L-Theanine is an amino acid that is non-dietary is found in the mushroom Xerocomus badius and green tea (Camellia sinensis). If you look at L-Theanine structurally, then it is very similar to the neurotransmitters I-glutamine and I-glutamate.

L-Theanine can cross the blood-brain barrier easily and can be taken in the form of a supplement or via green tea; this nootropic can reach your brain in thirty to forty-five minutes making it incredibly effective.

Nootropics L-Theanine assists in:

  • Neurotransmitters – It helps in increasing the levels of serotonin, GABA, and dopamine inside your brain and this helps in producing a calming effect and also provides you with immediate energy. It also helps in improving your memory and cognition.
  • Neuroprotection – L-Theanine nootropic is an antagonist of NMDA receptor and can inhibit the release of glutamate. This helps in shielding your brain from over-stimulation that is caused by glutamate and glutamate toxicity.
  • Brain Waves– The nootropic L-Theanine helps in boosting the alpha brain waves and these waves’ help in stimulating alert relaxation. Theanine also helps n increasing theta brain waves; these waves are commonly associated with providing relief and creativity that you get from trauma.

L-Theanine to the rescue

L-Theanine to the rescueThe nootropic L-Theanine helps in providing you energy without draining you out, calms you down without causing you to sleep and even helps in motivating you. Since tea is a source of L-Theanine, it allows you to have as much caffeine as you want but it will not give you the same speedy effect as caffeine in coffee does.

This amino acid also helps in making you sleep better. Apart from enhancing the quality of sleep, L-Theanine also helps in recovering from exhaustion and helps in making you feel refreshed. This nootropic puts you in a good mood throughout the day and once it crosses the blood-brain barrier and enhances the levels of the neurotransmitters; it has a controlled effect on your mood.

How Does L-Theanine Feel?

How Does L-Theanine FeelThe uniqueness of your brain structure, brain waves, brain activity and neurotransmitters play a significant role in your response to L-Theanine. Many neurohackers claim that L-Theanine provides a calming effect within thirty to forty-five minute and providing a cognition boost and causing the energy levels to rise without any stimulants like caffeine.L-Theanine has also decreased the number of anxiety and panic attacks, but users are advised not to combine this nootropic with anti-anxiety medications such as Xanax.

This drug is also said to help in improving your sense of wellbeing as well as the quality of life. This overall improvement leads to better sleep at night.

The Research

L-Theanine ResearchThere has been a lot of studies carried on the benefit of this nootropic and some researchers (1) in Japan gave some volunteers around 200mg of this drug and recorded their sleep pattern. The results of this research showed that this nootropic enhanced the feeling of refreshment, the quality of sleep and also helped these volunteers to recover from exhaustion faster.

Some other research done is mentioned below.

Green Tea reduces the incidence of stroke

Research done in China on the effect L-Theanine has on the heart during stroke shows that if this nootropic is present inside the body anytime a stroke occurs then the damage caused to the brain at this time can be reduced significantly.

To put this study in progress, researchers picked out 12,212 volunteers from twelve provinces, and these volunteers were of age thirty-five to sixty years old. The research further focuses on their status of drinking tea, the dosage as well as the type of tea.

This research then concluded that there was a decrease in the risk of stroke by 40% in volunteers who drank black, jasmine and green tea. This proving the fact that L-Theanine can reduce the occurrence of a stroke.

L-Theanine Helps In Improving Memory

In another blind and a placebo-controlled study, the effects that L-Theanine nootropic has on attention and memory was inspected.

In this research 91 volunteers that had mild impairment in their cognitive functions were enrolled. One group was provided with 1,680 mg of this nootropic daily for a period of 16 weeks. The control group was given a placebo.

This research proved that L-Theanine increased the Theta waves in the brain that are usually linked to cognitive creativity and alertness. This study also showed an improvement in memory and suggested that this drug has the ability to act as a cognitive improver.

L-Theanine Reduces Stress

There have been numerous researches dedicated entirely to L-Theanine and how this drug helps in benefiting by releasing stress in animals as well as humans. There is no doubt due to the sufficient documentation provided on stress and corticosterone and how it can affect your memory negatively.

Corticosteroids that are released after stress can leave a strong and prolong effect on the formation of memory.

A study carried out on animals was done using rats. These rats were given water for 3 weeks, and this water contained the nootropic L-Theanine. They were then put through stress by prompting them to exercise. The researchers then found out that the rats that drank the L-Theanine water had low levels of corticosterone when compared to those who had none.

In fact, it was proven that stress had no effect at all on the animals who were fed with L-Theanine and their memory was left unaffected. This research proved that this nootropic helped in changing the secretion of corticosterone and this drug is great for preventing memory loss that can be induced by stressful situations.

Dosage Notes

L-Theanine DosageIt is very important that these drugs are taken by their recommended dosage to help prevent your body from becoming tolerant or too dependent on them. The recommended dosage of the nootropic L-Theanine is around 200 to 400 mg, and this can be taken once or maximum twice in a day. According to the Cleveland Clinic Wellness, the maximum milligrams of L-Theanine taken should be 1200 mg per day.

Since this nootropic is water soluble, you can even take it with a glass of water.

If you are taking this nootropic via green tea, then you must know that the labels on high-quality green tea only show the amount of green tea leaves present in the package and this is measured in milligrams. But these packets do not mention the amount of L-Theanine present in the packet.

A properly saturated green tea will offer you 1-2 % of L-Theanine content per cup. With this ration, you can find out that a 1,500 mg of green tea will give you 30 mg of L-Theanine. However, your mileage may differ, and you will have to figure out on your own what dose is best for you. You can do this by starting at a very low dose, for example, 100mg and then make your way up slowly to a higher dose until you get your desired result.

Side Effects

L-Theanine EffectsThere have been no direct or confirmed side effects on using L-Theanine and is considered to be safe whether taken in the form of a supplement on taken via tea that contains this nootropic.

However, it is especially advised that women who are currently breastfeeding or pregnant should keep a slow hand on the amount of tea they drink as this can lead to over-caffeinating.

This drug is a naturally occurring amino acid and can be found in a specific species of mushrooms and in plants such as tea, so this nootropic is considered extremely safe and non-toxic. But, it can decrease your blood pressure so if you are using any medication to deal with high blood pressure, make sure to use this drug cautiously; this drug can cause your blood pressure level can drop if it interacts with such medicines so stay aware.

Available Forms

L-Theanine FormsL-Theanine is available in different forms of tea such as green, black and white teas. However, the highest concentration of this drug can be found in green tea.

This green tea can provide neurohackers with an additional benefit since it also contains caffeine. A proper saturated cup of high-quality green tea can provide you with caffeine, but this caffeine is lower than caffeine present in coffee (almost 10mg lower).

A nootropic stack is when these supplements are taken along with another supplement, and this stacking helps in providing better results hence increasing the potency of this drug. This nootropic L-Theanine can also be taken in stacks, and the stacks for it are:

L-Theanine + Caffeine Stack

A study carried out in the United Kingdom, Unilever on the effects of the combination of L-Theanine and caffeine and how they impact your mood and your cognitive performance. To carry out this research they compared around 100mg of L-Theanine with only fifty milligrams of caffeine.

This research team consisted of 27 participants, and the measurements were based on the processing of visual information, word recognition, switching of attention and mood. The performance of these volunteers was measured once at the beginning, then after an hour of consumption of these products and then after ninety minutes as well.

Both of these products were then taken separately after a washout period of 7 days. This research concluded that caffeine helped in improving the alertness of volunteers after 60 minutes and precision of switching attention was improved at 90 minutes. However, the combination of L-Theanine and caffeine helps in improving both speed and precision and also reduced the vulnerability of distracting information during the memory task.

It was established by the research team that caffeine and L-Theanine were both beneficial when they were combined and helped in improving the performance of tasks that made use of cognitive abilities.

For additional effect, L-Theanine also helped in taking you off from increasing consumption of caffeine.

L-Theanine From Green Tea

Extracting an ideal amount of L-Theanine nootropic requires art and science.

Researchers from the University of Newcastle present in Australia decided to figure out the ultimate conditions required when extracting this nootropic from a high-quality cup of green tea. These researchers used four different methods of extraction and figured out the ideal extraction time, ratio of water with tea, the particular size of tea and the temperature; and how it impacted the yield of L-Theanine extracted from the green tea.

These researchers concluded that the ideal condition for extracting out the nootropic L-Theanine from green tea was with water to tea ratio of 20 to 1 mL/g, the temperature of 80 degree Celsius for thirty minutes and the green tea particle size of 0.5 to 1mm.

L-Theanine Supplements

If you don’t want to follow the entire process of extracting L-Theanine from green tea leaves as mentioned above, then you will be happy to find out that this nootropic L-Theanine is also available in the form of supplements as a capsule and a tablet.

Taiyo, a Japanese company, is one of the oldest and the most established company present in the industry of green tea supplement production. This company went a developed a patented technique of extracting this nootropic from a green tea known as “Suntheanine.”

This form of nootropic is known as the L-Theanine source by numerous large supplement makers. If your packet of supplements has Suntheanine on the packaging, then you can be certain that the amount of L-Theanine listed in each capsule is the actual amount present in them.

Some research shows that few of the supplement makers try to adapt their own method of extracting L-Theanine and this can cause the supplements to have more than the “L” form of Theanine nootropic. It this extraction is not done correctly then you may end up buying a “D” form of the nootropic.

D-Theanine can have an altered action on your body as compared to nootropic L-Theanine. This diverse effect is not considered dangerous, but D-Theanine nootropic can decrease the benefit that you may achieve from the pure of L-Theanine.

So when finding yourself L-Theanine nootropic, it is important that you spend your time in reading the labels and reviews of people who have used the product in order to find the L-Theanine supplement that’ll work for you.


It is recommended that you use L-theanine as a nootropic supplement as your body cannot make this amino acid on its own.

This supplement is incredibly beneficial to you, and if you want to see the effect L-Theanine nootropic has on your brain, you can use an electroencephalogram (EEG).

Theanine nootropic is mostly known for lowering down your blood pressure, relaxing you, increasing your ability to think, strengthen your focus and even change your mood. This amino acid helps in balancing the chemistry in your brain and also improves cognitive health.

L-Theanine helps in smoothing out the brain waves causing your body to relax and your mind to calm down instead of making you feel sleepy. As soon as this nootropic crosses the blood-brain barrier, it elevates the amount of dopamine and serotonin increasing your feeling of well-being.