L theanine dosage for adhd

L-Theanine Dosage: a Guide for Adults, Children, and Pets

We’ll take a closer look at some important L-Theanine information, especially with regard to the best dosage for the specific benefits you’re hoping to realize.


1. What is L-Theanine?
2. How does L-Theanine work?
3. L-Theanine Benefits
4. L-Theanine dosage
5. Where to Buy L-Theanine
6. Conclusion

Ever since it was first discovered over fifty years ago, the amino acid L-Theanine has provided users with a range of different mental and physical benefits. Adults, children, and even pets can benefit from taking L-Theanine as part of their supplement routine.

While it’s a naturally occurring amino acid, L-Theanine isn’t something your body produces. To unlock the benefits of L-Theanine , supplementation is necessary. Today, we’ll take a closer look at how an L-theanine supplement can benefit you and discuss how to take L-Theanine effectively.

What is L-Theanine?

L-Theanine is an amino acid that’s naturally found in green and black tea. First discovered by Japanese scientists in the 1940s, extensive testing on L-Theanine has revealed a variety of positive effects from stress relief to improved sleep.

What’s more, there’s also some nootropic and neuroprotective effects of L-Theanine which makes it a popular supplement for those looking to achieve the mental edge they need to succeed.

While L-Theanine can be found naturally in black tea, green tea, and certain kinds of mushrooms, you won’t be able to get a therapeutic dose of L-Theanine without using a supplement.

How Does L-Theanine Work?

Once ingested, L-Theanine goes to work supporting many critical processes that are going on in your body at all times.

Research suggests that L-Theanine affects the production and release of dopamine, serotonin, and GABA. These brain chemicals have a profound effect on your stress responses and overall mood. They can also affect how well you sleep.

There also appears to be a neuroprotective effect, as L-Theanine may be able to reduce inflammation and quell excitatory brain chemicals which can increase stress and anxiety levels. This powerful amino acid also helps protect cells against stress and age-related decline.

L-Theanine can bond to the same receptors as glutamate, which is one of the brain’s most important excitatory chemicals, which is responsible for many of our internal stress responses. But, since L-Theanine is inhibitory, it actually reduces the stress response of these receptors, which translates to a feeling of reduced stress.

L-Theanine also appears to increase alpha brain waves, which are tied to our ability to relax. The effect is dose-dependent, with higher doses leading to greater increases in alpha brain waves.

L-Theanine Benefits

The benefits of L-Theanine are well researched. However, as with any drug or compound, the science behind it is always developing and evolving. Based on what we know so far, it seems that L-Theanine provides a range of powerful benefits that help improve everything from your stress responses and mental state to the quality of your sleep.

Since L-Theanine can bond to the same receptors that are affected by glutamate, they reduce the brain’s ability to respond to stress. This is critical for neurohackers who need an edge to thrive in high-stress environments.

L-Theanine also increases the production of GABA, and GABA has anti-anxiety and anti-stress properties, which further reinforce its calming benefits. Possibly related to the anti-stress effects, studies have also shown that L-Theanine can improve focus and alertness while you remain relaxed, and attenuate high blood pressure resulting from stress.

The relationship between stress and cognition is well documented, and it’s something you experience in your daily life. When you’re stressed or anxious, it’s difficult to focus, your mind wonders, and your concentration deteriorates. Since L-Theanine seems to inhibit stress and anxiety, it’s no wonder that recent studies have suggested that it can improve cognition and focus.

L-Theanine also helps boost nitric oxide production, which is a critical chemical that affects how well blood flows through the arteries, and more nitric oxide helps to reduce the risk of ischemic stroke. Some studies have also suggested that L-Theanine supplementation immediately following a stroke can reduce the severity and damage of the episode.

Since L-Theanine helps to reduce feelings of stress while increasing feelings of relaxation, it’s no wonder that studies show that it can lead to easier, more restful sleep.

When administered with caffeine, the two compounds appear to exhibit a symbiotic function, increasing the effectiveness of both. As such, L-Theanine and caffeine is a popular combo in the nootropic community.

At this point, you’re probably noticing there’s a theme here: L-Theanine’s ability to reduce stress and anxiety leads to a variety of other benefits that are connected to how our body reacts to stress. This is also true for those suffering from schizophrenia since their symptoms are also brought on by heightened stress and anxiety. The reduction in stress that L-Theanine provides may help to reduce the symptoms of the disease.

Further still, the benefits aren’t limited to humans, either. Dogs and cats can also benefit from L-Theanine, and pet lovers who have particularly anxious and highly stressed pets consider it to be heaven-sent. One study that examined a group of cats response when found that their stress-related symptoms were reduced with L-Theanine doses.

L-Theanine Dosage

Since it’s virtually impossible to take in a meaningful amount of L-Theanine from natural sources, those looking to unlock its powerful benefits must incorporate a supplement into their routine.

When it comes to L-Theanine dosage, Reddit users seem to mirror the accepted standard doses are usually in the 200-400mg range, taken once or twice daily.

Users have also noted using L-Theanine at much higher doses with no noticeable side effects, and since it’s so well-tolerated, there really is no such thing as an L-Theanine maximum dosage.

The effects of L-Theanine are dosage dependent, and you may find that a dose you’d take for general stress and anxiety relief could be different from a dosage you’d take to promote sleep or the dosage you’d give to a child or pet to reduce stress and anxiety. Size and weight also play a part in the effectiveness of a dose.

The list below has some general guidelines for different daily dosages:

  • Typical L-Theanine dosage: 200-460mg
  • L-Theanine dosage for anxiety: 300-900mg
  • L-Theanine dosage for panic attacks: 300-900mg
  • L-Theanine dosage for severe anxiety: 600-1,200mg
  • L-Theanine dosage for insomnia: 400-1,000mg
  • L-Theanine dosage for ADHD: 300-900mg
  • L-Theanine dosage for depression: 300-900mg
  • L-Theanine and caffeine dosage: 2:1 ratio (i.e., 200mg L-Theanine and 100mg caffeine per dose)
  • L-Theanine dosage for Children: 100-300mg
  • L-Theanine dosage for cats: 50-200mg
  • L-Theanine dosage for dogs: 50-1,000mg depending on size

L-Theanine can be taken with or without food. After dosage, the onset of the effect takes roughly 30 minutes to an hour, and the peak effects last for two to four hours, while residual effects may be felt for several hours longer.

Those who are taking L-Theanine for sleep should take their dose 30-90 minutes before bedtime.

L-Theanine may become less effective over time as your body develops a tolerance. To inhibit this, many users will cycle five days on and two days off.

Those who like to enjoy a drink will be happy to know that L-Theanine seems to present no negative interactions with alcohol. In fact, the antioxidant effects of this amino acid suggest that it may help reduce hangover symptoms.

L-Theanine has been studied extensively, and it’s safe when consumed at standard dosage, and it isn’t habit-forming. Side effects include headaches, dizziness, or nausea. These side effects are quite rare, and if present, they’re usually only seen with higher doses. If you experience these symptoms, reduce your dosage, or stop taking L-Theanine entirely.

L-Theanine Dosage for Pets

When it comes  pets, Dr. Heidi Lobprise, DVM recommends preparing for any stress-inducing episodes like fireworks, parties, or car rides, by providing one dose twelve hours and another dose two hours before the activity.

While a dosage of 50-100 mg is usually sufficient for cats and small dogs, you’ll need to increase the dosage to account for larger pets. If you have a mastiff, for example, a dosage of 500mg or more may be recommended. Consult the label for more specific information on the proper dosage.

Dosage Notes for Beginners

L-Theanine is a great starting point for anyone looking to see what nootropics are all about, or if you’re just looking to reduce stress and anxiety naturally and without prescription drugs.

If this is your first-time taking L-Theanine , ramp up your dosage slowly as you find the best dosage for you. Start with a low dosage of around 200mg and increase it as necessary until you’ve found the ideal range for you.

L-Theanine Dosage for Beginners

Whether you’re using Noopept or any other nootropic, it’s important that you exercise caution when incorporating new supplements into your routine. If you experience any side effects when taking Noopept, decrease, or discontinue use altogether.

Always follow recommended dosage guidelines, and consider getting started with half the recommended dose and ramping up from there so you can learn how your body reacts to Noopept in a more controlled way.

If you’ve used a racetam before, keep in mind that while the effect may be similar to Noopept, the Noopept dosage is much smaller than a typical dosage of a racetam. Where users may take 1,000mg of piracetam in a dose, a typical dose of Noopept is 10mg.

Where to Buy L-Theanine

At Nootropics.com, you can buy L-Theanine in a jar of 60x200mg capsules. L-Theanine is also included in our Focus Without Stress Stack, Work Stack annd Sleep Stack.

All of our products are quality tested once after manufacturing, and then undergo a stringent process of quality assurance by an independent third-party lab. You can find a link to our Certificate of Authenticity on the L-Theanine product page. We test for identity, purity, and use FTIR and HPLC to make sure the sample does not contain heavy metals.

Our customers get free shipping on orders over $70 in the US and $200 for international orders. If you buy 2 or more jars, you get a 5% and 10% discount. We offer a money-back guarantee 90 days after you buy any of our products.

We only use vegetable capsules suitable for vegans.

Final Words

Whether you’re looking to incorporate a safe and effective nootropic that can help reduce stress, anxiety, and even improve your sleep, or you’re hoping to help your pets or children do the same, L-Theanine is a great supplement to add to your regimen.

L-Theanine is unique in the sense that there’s a wide dosage range, and the typical therapeutic dose can vary greatly depending on your reasons for using this supplement. Our dosage guidelines above are a great starting point to work from. As you learn more about different nootropics and what your body reacts best with, you can amend the dosage from there.

The effects of L-theanine (Suntheanine®) on objective sleep quality in boys with attention deficit hyperactivity disorder (ADHD): a randomized, double-blind, placebo-controlled clinical trial

Randomized Controlled Trial

. 2011 Dec;16(4):348-54.

Michael R Lyon  1 , Mahendra P Kapoor, Lekh R Juneja



  • PMID: 22214254

Randomized Controlled Trial

Michael R Lyon et al. Altern Med Rev. 2011 Dec.

. 2011 Dec;16(4):348-54.


Michael R Lyon  1 , Mahendra P Kapoor, Lekh R Juneja


  • PMID: 22214254


Introduction: The purpose of this study was to investigate the efficacy and safety of L-theanine as an aid to the improvement of objectively measured sleep quality in a population of 98 male children formally diagnosed with attention-deficit/hyperactivity disorder (ADHD).

Methods: A randomized, double-blind, placebo-controlled trial was conducted involving boys, ages 8-12 years, who had been previously diagnosed with ADHD. An experienced physician confirmed the diagnosis of ADHD in each subject. Randomization was stratified based upon current use of stimulant medication to ensure an equal distribution of stimulant/non-stimulant treated subjects into active and placebo treated groups. Participants consumed two chewable tablets twice daily (at breakfast and after school), with each tablet containing 100 mg of L-theanine (total 400 mg daily Suntheanine®, Taiyo Kagaku, Yokkaichi, Japan) or identical tasting chewable placebo for six weeks. Subjects were evaluated for five consecutive nights using wrist actigraphy at baseline, and again at the end of the six-week treatment period. The Pediatric Sleep Questionnaire (PSQ) was completed by parents at baseline and at the end of the treatment period.

Results: Actigraph watch data findings indicated that boys who consumed L-theanine obtained significantly higher sleep percentage and sleep efficiency scores, along with a non-significant trend for less activity during sleep (defined as less time awake after sleep onset) compared to those in the placebo group. Sleep latency and other sleep parameters were unchanged. The PSQ data did not correlate significantly to the objective data gathered from actigraphy, suggesting that parents were not particularly aware of their children's sleep quality. L-theanine at relatively high doses was well tolerated with no significant adverse events.

Conclusions: This study demonstrates that 400 mg daily of L-theanine is safe and effective in improving some aspects of sleep quality in boys diagnosed with ADHD. Since sleep problems are a common co-morbidity associated with ADHD, and because disturbed sleep may be linked etiologically to this disorder, L-theanine may represent a safe and important adjunctive therapy in childhood ADHD. Larger, long-term studies looking at the wider therapeutic role of this agent in this population are warranted.

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health benefits and harms, properties

The cult of success, widespread in our modern world, does not allow us to relax even for a moment. All the time you need to be in good shape, so as not to lose your position in the "brain race" and always finish among the leaders. If we study, we should be among the strongest students with excellent academic performance. If we work, we must be listed among the most effective and promising employees.

We are constantly surrounded by endless speeches, business negotiations, exams, tests, burning deadlines ... How to cope with such a frantic workload, when stress and worries cover our heads, not allowing us to concentrate even on simple everyday tasks? Not to mention more responsible situations where you need a cool head, maximum concentration, composure and self-confidence. How to turn off stress and at the same time leave the brain turned on?

To succeed in the world around us, you need to be as productive, purposeful and focused as possible - but you also need to have impeccable calm and unwavering endurance. It only seems impossible at first glance, but in fact it is possible to achieve this - special supplements based on amino acids will help, which stimulate brain activity and reduce the manifestations of stress.

"Magic pill" for man

Japanese researchers have discovered a unique substance that can activate cognitive functions, increase efficiency, give a person a charge of creative energy and improve his memory. At the same time, such a remedy does not provoke overexcitability of the nervous system - on the contrary, it allows you to maintain a "cold mind", calmness and endurance in any situation - even the most stressful. In fact, this substance works as a legal "dope" for the brain, which brings it into tone and helps it work much more efficiently, while not causing side effects such as distraction, nervous excitability, or worsening sleep quality.

This amazing remedy is an amino acid called L-theanine, which is found in abundance in green tea leaves. However, not every green tea will be able to supply you with the right amount of this substance. Its concentration in tea leaves may depend on the time of their harvest, the method of fermentation of the leaves, and even on the characteristics of the area in which the tea plantation is located. Therefore, no one can calculate how much theanine you get from your usual cup of morning tea.

Fortunately, drinking liters of green tea in order to experience all the amazing properties of L-theanine is no longer necessary today. Modern pharmaceuticals have found a way to extract this substance from tea leaves, clean it as much as possible from excess impurities and enclose it in the most convenient format for use - capsules.

What is the secret?

The main action of L-theanine is to stimulate alpha activity in the brain. But what does this mean? Alpha wave activity is responsible for reducing symptoms of stress, reducing anxiety and nervousness, and improving well-being and mood. In other words, this component has an effect on the brain similar to the effect of meditative practices that allow you to quickly calm down, relax and at the same time not lose the ability to concentrate on complex tasks.

This substance is able to return to a person a sense of calm, lightness and peace without drowsiness, which at the same time will be combined with high concentration and efficiency. In other words, the use of this component allows you to achieve maximum performance, while maintaining calm and relaxation.

What else can this amino acid do?
  • Enhances cognitive functions and brain activity. Thanks to this, a person can perform complex tasks that require maximum concentration much faster, and at the same time avoid significant errors due to absent-mindedness or inattention.

  • Stimulates the synthesis of the neurotransmitter dopamine, which is responsible for memory, high concentration of attention and good mood, and also increases physical endurance during intense training.

  • Naturally increases the level of gamma-aminobutyric acid, which works as a relaxant, and also helps to improve impulse conduction between brain cells.

  • It improves the quality of sleep by reducing the manifestations of stress, but it does not have sedative properties, does not cause drowsiness and does not increase reaction time.

  • Reduces the physiological symptoms of stress or overexertion - and according to some studies, even reduces high blood pressure and reduces stress-induced heart rate.

  • Reduces the overall excitability of the nervous system and thus has a beneficial effect on people with manifestations of attention deficit hyperactivity disorder (ADHD).

An important difference between this component and other stimulants is that you do not need to wait for the cumulative effect with it, since it begins to act from the first day of use. Due to its mild effect on the body, L-theanine does not cause addiction or drowsiness, so it can be used both in courses and constantly - even during the daytime.

The overall effect of theanine on the body is surprising. It helps to remain calm even in the most stressful situations, to maintain focus, maximum concentration and focus on results without unnecessary anxiety. Improves the quality of sleep, allowing you to sleep better and stay alert throughout the day. In doing so, it reduces excessive beta wave activity, which studies have linked to increased nervousness, hyperactivity, and distraction.

As a result, we get both relaxation and concentration, reduced stress levels and increased brain activity. The same combo that in our time is necessary for people aimed at maximum performance.

How to get an effective dosage?

When choosing an L-theanine preparation, first of all, you need to pay attention to the dosage, because it will depend on it how clearly the effect of this amino acid will manifest itself. According to studies, the optimal dosage of this substance is 500 mg per day: this is how it will most effectively deal with the manifestations of stress. If you take less than the recommended dose, then the effect of the drug may be insufficient or not appear at all.

But is it possible to get the amount we need without the use of special additives - for example, from ordinary tea? Let's count. In one cup of green tea, L-theanine is found in very small amounts - usually only 10 to 20 mg. It turns out that to get even a minimal dose of this substance, you will need to drink at least 10 or even 20 cups per day! Firstly, this in itself already sounds unrealistic. And secondly, in addition to valuable nutrients, tea also contains other stimulants - for example, caffeine, which has a much more pronounced effect. When drinking this amount of tea, there is a high risk of getting an overdose of caffeine, which will lead to the opposite effect: increased pressure, excessive anxiety, increased heart rate, increased reaction time, and other unpleasant symptoms.

To make sure you're getting just the action you need without the side effects, it's best to take theanine capsules, which contain the optimal concentration of the active ingredient and are free of impurities and unnecessary additives.

Evalar specialists have developed the only drug 1 in Russia "Theanine " from the ANTI-AGE series, which contains the optimal daily dosage of this substance - 500 mg

Why choose Theanine from Evalar

1. For the production of its products, Evalar uses high-quality Japanese raw materials, which go through several stages of purification and are repeatedly tested for compliance with safety and quality standards.

2. All equipment, premises and production processes used in the manufacture of Evalar additives comply with the licensing requirements and conditions of international GMP quality standards, which is confirmed by official certificates. This guarantees high efficiency, quality and safety of all brand products.

3. The Evalar company has been present on the Russian market for more than 20 years and is the country's largest manufacturer of dietary supplements. In the category of natural products for improving the quality of life and promoting health, the company is recognized as No. 1 in Russia 2 .

4. "Theanine" Evalar allows you to calm down, relax, relieve yourself of unnecessary stress and worries, while maintaining complete clarity of consciousness and mind, high mental activity and concentration. The tool does not provoke drowsiness or inhibition of reactions, does not cause addiction or side effects. The drug also helps to normalize blood pressure and heart rate, which can rise even in healthy people due to stress or nervous strain.

To be more collected, calm and concentrated, to spend your day as actively as possible and at the same time minimize the manifestations of everyday stress, try taking 2 capsules of Theanine Evalar at the beginning of each day. Almost immediately, you will be able to notice how much more calm and efficient you will feel throughout the day.

1 According to CJSC DSM Group, the dietary supplement Theanin produced by Evalar is the only dietary supplement containing 500 mg of L-theanine in the recommended daily dosage among dietary supplements sold through Russian pharmacies results of the 1st quarter of 2019of the year.
2 According to the results of the nationwide vote "People's Brand" in the category "Natural drugs to promote health and improve the quality of life" for 2009, 2011 and 2013.

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April 20, 2020

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dose in times of trouble
improves sleep quality, reduces symptoms of premenstrual syndrome, improves visual acuity, and reduces the negative side effects of caffeine.These clinical effects are directly related to L-theanine's ability to stimulate alpha brain wave activity.The drug helps people stay calm, focused, focused, and have brain energy.It also reduces beta wave activity associated with nervousness, scattered thoughts, and hyperactivity.

In Japan, L-theanine has been approved for use for decades as an aid in coping with stress and promoting relaxation. It is a very popular ingredient in Japanese functional foods and drinks, as well as dietary supplements designed to provide mental and physical relaxation without the effect of drowsiness. L-theanine is a fast acting remedy. Typically, effects are felt within the first 30 minutes and have been shown to last up to 8-12 hours.

At standard doses, eg 100-200 mg, L-theanine does not act as a sedative, but significantly improves sleep quality. In one double-blind study, L-theanine 200 mg was shown to result in statistically significant improvements in sleep efficiency, a measure of actual sleep time between the time you fall asleep and nocturnal awakenings.
L-theanine - a special brain stimulant for children

Like adults, children are exposed to stress and pressure every day. Temporary, minor stress does no harm, and most children do well with it. On the contrary, long-term daily minor stresses accumulate and become just as devastating as major stressful events, wreaking havoc on physical, emotional and mental health. A general sense of insecurity can cause children to experience increased levels of anxiety and depression.

L-theanine stimulates the production of alpha brain waves and also suppresses beta waves (associated with nervousness, scattered thoughts and hyperactivity). This is especially helpful in helping children who have trouble falling asleep and staying asleep because their head refuses to turn off at night. A recent study from the University of British Columbia found that 200mg of L-theanine twice daily was safe and effective in improving some aspects of sleep quality in boys aged 8-12 diagnosed with Attention Deficit Disorder (ADHD). Because sleep problems are common in children with ADHD, and because disturbed sleep can worsen this disorder, L-theanine may represent a safe and important adjuvant role in the treatment of ADHD in childhood.”
L-theanine for adults is best taken as part of an anti-stress formula - this one is just great https://www.iherb.com/pr/ZOI-Research-Stress-Support-180-Vegetarian-Capsules/96342?rcode= SNB732

infant forms of L-theanine - eg gummies https://www.

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