Sebastian Freidank - 18. February 23

L-Theanine Effects - Concentration, Sleep, Depression & Caffeine


The L-theanin effect is extremely exciting on many sages! In combination with caffeine, L-Heanin has a magnificent effect! But L-Heanin can also have a positive effect on sleep and depression.

In this article we would like to focus on the effect of L-theanin, so that in the end you understand exactly what advantages this exciting amino acid has and how you can use it for yourself.


Video summary


  1. What is L-theanin?
  2. Where is Theanin included?
  3. L-theanin effect
    1. General use of L-theanin
    2. Concentration-L-theanin effect
    3. L-theanin effect on sleep
    4. L-theanin effect on stress
    5. immune system
    6. L-theanin effect in depression
    7. Blood pressure
  4. Effect L-theanin and caffeine
  5. L-theanin dosage
  6. Side effects of L-theanin
  7. Conclusion

1. What is L-theanin?

L-theanin is a non-proteinogenic amino acid. It is therefore not built into the body as a protein. The amino acid acts in the brain and is accordingly some of a few that the brain blue barrier can pass. The effect of L-theanin is described as relaxing, stress and fear reducing and in a sleep-constricting. More about effect later.


2. Where is Theanin included?

Rarer as gold could almost say, because L-theanin only occurs in two plants and a mushroom. At least no further source has been found.

  • guayusa
  • Camellia sinensis
  • Chestnut

For a pure L-theanin powder you have to, as withcaffeine Also, carry out an extraction.

Where is L-theanin included?


3. L-theanin effect

3.1. General use of L-theanin

Since L-theanin has a relaxing effect, many people use it to reduce stress states or to reduce fears and depression. L-theanin is often taken in dissolved form as a tea or as an extract.

It should also increase mental performance and attention and lead to increased focus. In addition, it should have a blood pressure-regulating effect and improve the quality of sleep.

Let's take a closer look at the effects of Theanin.

3.2. Concentration-L-theanin effect

Taking L-theanin is intended to improve concentration and learning ability. This can be an advantage before an important test or in demanding mental work. At a study After taking a one-time capacity, it was possible to determine the L-theanin effect on cognitive skills that the test subjects cut faster and with fewer errors in reaction tests. The study came after 12 weeks To the conclusion that attention, the memory capacity of the brain and executing processes are positively influenced.


3.3. L-theanin effect on sleep?

A study dealt with the effect on our sleep. A 2011 The study carried out shows that L-theanin causes a deeper and more relaxed sleep. After 6 weeks of taking 100 mg L-theanin twice a day, the sleep behavior of the participants improved.

One Another study showed that 200 mg to 400 mg significantly improved sleep from humans and animals.

Further studies showed one lower heart rate In the rest mode of the test subjects and a better sleep quality of ADHD boys.


3.4. L-theanin effect on stress

Studies showed that L-theanin has a soothing effect on the mind without making sleepy. In addition, the amino acid should help to stress and fear in stressful situations to reduce.


L-theanin effect overview


3.5. immune system

Also the decline of Respiratory diseases and Intestinal infections could be detected in drinks in a study on L-theanin.


3.6. L-theanin effect in depression?

Similar to the studies on fear and stress, examinations in patients with chronic depression come to the Resultthat L-theanin has a soothing effect.


3.7. Blood pressure

At a Carried out in 2012 Regarding the effect of L-theanin with people who tended to high blood pressure in stressful situations, it was observed that taking around 200 mg L-theanin lowered the blood pressure of the test subjects in advance.

Five other studies, which checked the intake of L-Heanin at regular intervals, also led to these blood pressure-reducing results.

In two Japanese studies Could a remarkable L-theanin effect be determined. It has been proven that L-theanin only causes a reduction in blood pressure if there is a problem, but not if no stress causes an increase. L-theanin can therefore rather than Blood pressure-regulating be described as lowering.


4. Effect L-theanin and caffeine

The combination of L-theanin and caffeine has already been examined in studies and showed a better one among the subjects Attention, and ability to solve the tasks. The Participant Also felt more relaxed and more alert.

In general, it seems that attention, mood, memory and reaction clearly improved become.


Effect L-theanin and caffeine


5. L-theanin dosage

There is no official dosing recommendation for L-theanin, but the studies can quickly be taken from the studies that a daily dose of 200 mg to 400 mg has an efficient and positive effect. This dose can be taken for 4 to 6 weeks or longer.

If you tend to start a self -experiment, we will of course advise you to inform your doctor and ask for advice and obtain further information.


6. Side effects of L-theanin

So far, no L-Heanin is known. Acceptance as a supplement of 900 mg daily has been tested in studies over 8 weeks. Of course, this is not a medical recommendation. Contact your doctor and inform yourself in detail.

guayusa tea Contains both L-theanine and caffeine. You can find information about the caffeine Pretend and the Disadvantage In our extra articles. An overall overview of the active ingredients in guayusa do you find here.


7. Conclusion

L-theanin is an ingenious active ingredient with a magnificent effect that can help against stress, fear and depression. But not only that, L-theanin improves sleep and cognitive skills-according to the study situation.

The effect is therefore not just for professional Biohacker, but also for students, self -employed and everyone who is often exposed to stressful situations and mental challenges.

In combination with caffeine and other active ingredients such as Theobromine and Theophyllin L-theanin can have a synergetic effect.

Guayusa tea

Organic Guayusa from GUYA is original Guayusa from Ecuador. You can order our Guayusa directly from our shop and have it delivered to your home.

GUYA is Europe's first and largest Guayusa brand that offers you a large selection of Guayusa products. Our versatile Guayusa blends bring variety to your everyday life, keep you awake, focused and relaxed at the same time.

Since 2016 we have been working directly with farmers from Ecuador without intermediaries and have learned a lot about the processing of guayusa.

We look forward to your Guayusa order. 

Powder Guayusa

Buy pure guayusa tea powder. Our Guayusa powder offers you a variety of preparations without losing the organic quality.

Our PURE Guayusa Powder is original Guayusa, but particularly finely sieved to extract the powder particles . You can use the Guayusa powder in preparation of  a latte, cappuccino, espresso or for smoothies and pastries.

With the use of our Dripper , Guayusa powder can easily be used to prepare tea. The dripper's has a double-walled sieve that prevents the powder particles from getting into your tea. This way you can enjoy a delicious Guayusa tea without tea leaves in the water.


The Guayusa sets contain all our Guayusa tea flavours  as well as our tea accessories.Purchasing Guayusa in Sets is a best way to save money because  the Guayusa is in cheaper price in Sets than when sold as an individual product.

Our Guayusa comes from Ecuador and is organically grown there and traded fairly by us.

Each Guayusa set is put together differently and offers you a cheap alternative to expensive individual orders. Choose from sets with a teapot, tea glass, thermos flask, tea strainer and our 7 Guayusa varieties.


Our high-quality tea accessories made from stainless steel and special borosilicate glass have a long service life and can withstand all temperatures unconditionally! Find the right tea accessory for you in our online shop!

The glass products, as well as our stainless steel tea strainers, are suitable for any loose tea. All products can easily be cleaned in the dishwasher or under running water.

You can buy our products individually or in a combined package at a lower price.

Our tea accessories online shop also offers you a large selection of Guayusa tea which all together, as a set, make   an excellent gift.

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