Top & Best L-Theanine Review 2022 – How to Select Ultimate Buyer’s Guide

Top & Best L-Theanine: How to choose the best in 2022

If you are struggling to calm down or have a good night’s sleep, welcome to ReviewBox Brazil! In today’s article, we will deal with a food supplement that is becoming increasingly popular, L-Theanine.

L-theanine is an amino acid that in addition to having a calming action also acts to protect the brain. Therefore, today it is possible to find different types of supplements with this substance. And we’ll show you what to look for to choose the best one.

First, the most important

  • With direct action on the central nervous system, L-theanine can improve sleep, concentration, relaxation and even protect the brain.
  • It is possible to find L-theanine supplements in conjunction with other equally beneficial substances.
  • But attention is needed in the dosage and the ideal is that the consumption is made with medical monitoring.

You may also like:

  • Vitamin B12: How to choose the best one for you in 2022
  • Yoga Mat: Which is the best in 2022?
  • Multivitamin: How to choose the best in 2022

Best L-Theanine Supplements: Our Recommendations

  • Ideal for reducing anxiety
  • The best supplement as a whole



Buying Guide

Before starting to take a food supplement, it is essential that you understand how the substance works and will react in your body. The same goes for L-Theanine.

Although it is a natural and safe substance, it is necessary to pay attention to the composition of the different L-theanine supplements, the form of use and the dosage. To help you understand everything about L-theanine, we have created this Buying Guide. Check out.


What is L-theanine?

Discovered in 1949, L-Theanine is an amino acid present in teas derived from Camellia sinensis, also known as white, green and black tea, in addition to being present in some mushrooms.

L-theanine structurally similar to Glutamine and other neurotransmitters that are produced from it, and is known to have a positive action on our central nervous system.

That’s because it stimulates the production of alpha brain wave activity, which makes people feel calm and, at the same time, focused.



In addition, L-theanine also reduces beta wave activity associated with nervousness and hyperactivity. Therefore, L-theanine is known to be effective in combating stress and anxiety.

But the main characteristic of L-theanine is to actually relax, but without the sedative effect.


Did you know that L-theanine is a very popular ingredient in functional foods and drinks in Japan?

Japanese students often consume drinks and lozenges enriched with L-theanine to decrease stress and anxiety and increase attention.

What is L-theanine for and what are its benefits?

As we have seen, L-theanine has several functions in our body, and they all lead to a quality of life.

For you to understand more deeply about how L-theanine can act in your life, check out the main benefits of this amino acid below:

Controls anxiety

As it acts directly on the nervous system, it triggers the following responses in the brain:

    • It affects the alpha waves associated with the state of wakefulness and relaxation .
    • It increases levels of dopamine , the neurotransmitter that acts on emotions, mood and attention.
    • In some cases it can increase levels of serotonin , the neurotransmitter for “happiness” responsible for improving positive mood.
    • When associated with caffeine improves memory and reaction time.


Protects the Central Nervous System

Studies indicate that L-theanine can also protect the brain. The protection of cells in the Central Nervous System can have an important effect on diseases such as Alzheimer’s disease.

Improves sleep

With L-theanine the body and mind are calmed, but the symptom of drowsiness does not occur. In other words, L-theanine is not responsible for inducing sleep.

However, precisely because it causes relaxation, this substance is able to act on the quality of your sleep.

Research indicates that pre-sleep relaxation is extremely effective against insomnia, for example. Not by chance, L-theanine is prescribed by doctors as an alternative to improve sleep hours.

Protects the liver

L-theanine is also known to act on the liver. Studies have shown that consumption of L-theanine was able to reduce blood alcohol levels and reverse alcohol damage in the liver.

Operates in the Cardiovascular System

Because it contains L-theanine, green and black tea are known to stimulate the production of nitric oxide. Nitric oxide dilates blood vessels, increasing blood flow.

As a result, nitric oxide accelerates muscle recovery and gains in lean mass, strength and endurance.

L-theanine seems to promote the formation of nitric oxide having beneficial protective effects on the cardiovascular system.

What is the difference between L-theanine and other tranquilizers?

Some of the natural supplements that have an action similar to L-theanine are: Gaba, Glutamine and Tryptophan.

However, the intake of these supplements is effective only during sleep, so it is necessary to take them before bed.

L-theanine promotes instant relaxation. But the main difference of L-theanine in relation to other calming remedies is the fact that theanine has no sedative effect, which allows it to be used even in situations that demand focus and attention, such as when studying and working.



L-theanine and coffee: Why is this mixture good?

The relaxing properties of L-theanine also minimize the stimulating effects such as coffee, energy drinks, soft drinks and chocolates, for example. But the fact is that L-theanine is often used in conjunction with caffeine.

That’s because, with the use of caffeine, for example, we become alert. But in the end it is possible to feel anxiety and stress effects, which can disrupt the quality of your sleep.

In some cases, excessive use of coffee and energy drinks can even cause lack of attention, muscle tremors and other symptoms.



Therefore, the calming effect of L-Theanine reduces the negative effects of caffeine, but at the same time, it works in conjunction with the stimulant promoting the focus and retention of information by the brain.

However, before taking L-theanine in conjunction with caffeine it is essential that you have a medical follow-up.

What is the recommended dose of L-theanine?

L-theanine is fast acting, and the effects can be felt in about 30 minutes. In addition, the effects can last up to 12 hours.

Therefore, it is not necessary to consume high doses. In general, L-theanine is effective in doses ranging from 50 mg to 200 mg.

And while L-theanine is safe, experts recommend not to take more than 600 mg within a six-hour period.

Can anyone use L-theanine?

Although there are no studies that prove side effects or contraindications with the use of L-Theanine, it is common sense that this food supplement should not be consumed indiscriminately by everyone.

Pregnant women, who are breastfeeding and under 18 years of age should not use this amino acid without medical advice and monitoring.

What are the advantages and disadvantages of L-theanine?

There are many advantages of L-theanine in our body. The main one is that this amino acid induces relaxation and without giving you sleep.

In addition, L-theanine stimulates better quality sleep, reduces anxiety and reduces nervousness.

The result of all these actions is that L-theanine fights everyday stress, promoting an improvement in health and quality of life.



Not to mention that this amino acid still helps to improve focus, attention and memory, and still has the ability to decrease Premenstrual Tension (PMS).

On the other hand, as a disadvantage is the fact that not everyone can use this substance without medical supervision.

So, in general, check below the table that shows the main advantages and disadvantages of L-theanine.


  • Relaxes, calms, improves sleep quality
  • Increases focus, concentration and improves memory
  • Decreases PMS symptoms
  • It is not addictive and it does not hurt


  • Not everyone should use

Where to buy and how much does I theanine cost?

L-theanine in supplement form can be found in pharmacies, department stores and even large supermarket chains such as Lojas Americanas and Carrefour.


We recommend that you choose to buy L-theanine from online stores like Amazon.

However, if you are looking for more attractive prices, we recommend that you choose to buy L-theanine from online stores like Amazon.

In general, you will find L-theanine costing between R $ 25 and R $ 200. The price usually varies depending on the brand, dosage and quantity of capsules.


Purchasing Criteria: How to Compare L-Theanine Supplements

When choosing the best L-theanine supplement, you need to take some factors that influence not only the price, but the effect you want to have on your health.

Therefore, we suggest that you consider the following criteria before purchasing L-theanine.

  • Tea or supplement
  • Isolated or composite
  • Dosage
  • Amount

From here we will explain in detail each of these topics.

Tea or supplement

The first factor you should consider before you start taking L-theanine is how you will do it.

As we have seen, L-theanine comes from tea, especially green. However, according to experts, a cup of green tea has only 1% of the recommended daily amount of L-theanine.

Therefore, if you are looking for a better result in reducing anxiety and tiredness, the ideal is to opt for L-theanine supplements.


Isolated or composite

When choosing the best L-theanine supplement, you must also analyze the composition of the product. That’s because you can find supplements with L-theanine both in isolation and in addition to other compounds.

Not infrequently, you will find supplements that rely on doses of caffeine to increase concentration and improve memory.

Another option is the L-theanine supplement mixed with passionflower, to enhance the relaxation effect.


Another criterion that you should check is the dosage recommended by the manufacturer of the supplement. You can opt for L-theanine supplements whose daily dose can vary between 50 and 300 mg.


Also consider the amount of capsules that come in the supplement bottle. Take into account the period you intend to use to buy the necessary.


l theanine foods
l theanine dosage for anxiety
l theanine reddit
l theanine drug interactions
l theanine weight loss
l theanine dosage 600 mg
l theanine and caffeine
l theanine pregnancy


What has the most L Theanine?

How much L theanine should you take daily?

What is the difference between L Theanine and theanine?

How long does L Theanine take to kick in?

Which foods contain L Theanine?

Is L Theanine good for ADHD?

Does black tea have more L theanine than green tea?

Is L Theanine in all green tea?

What teas have theanine?

How much theanine should I take with coffee?

Does Lipton green tea have L Theanine?

Does all tea have L Theanine?


Similar Posts