Skip to main content

Top 12 Best L-Theanine Supplements

Written by Andrew Le, MD

UpdatedSeptember 4, 2024

L-theanine is a supplement that are widely used, mainly for the relaxation properties that a user undergoes after take the supplement. Of which, the L-Theanine is a naturally occurring amino acid in tea leaves, which is also available as a dietary supplement for people to consume more quantities than you can in tea.

Through reading this article, you will get to know the best L-theanine supplements on the market. Whether you are in search of a supplement that can assist in calming you down and therefore relieve you from stressing or a product that will assist enhance your concentration and focus, then our selection will come in handy for you.

Top 3 Best L-Theanine Supplements

  1. Momentous L-Theanine Capsules, 60 Servings
  2. Nutricost L-Theanine
  3. Sports Research L-Theanine Supplement

Below we have reviewed and ranked some of the best L-Theanine supplements which we have come across during our research. L-Theanine is an amino acid which is inherent in tea leaves and this compound relieves the stress both physically and mentally. Certainly, here are our most recommended L-Theanine supplements that you can buy today.


Momentous L-Theanine Capsules, 60 Servings

Editor's Choice

Momentous L-Theanine Capsules, 60 Servings

Momentous L-Theanine Supplement – is a focus enhancing supplement that doesn’t contain caffeine. Experience increased wakefulness and calmness with the help of the Suntheanine formula. A useful type, made with superior materials but efficacy may be different from one user to another..

See price on Amazon

For the people who are seeking for the similar feeling of alertness and focus like caffeine without having the side effects, we recommend the Momentous L-Theanine Capsules.

Pros

  • Promises feelings of relaxation, and calming effects, attention and wakefulness
  • Developed with the patented and scientifically tested Suntheanine
  • Double the amount of L-theanine green tea extract in a convenient max-strength formula

Cons

  • Not recommended to individuals with severe anxiety or sleep disorders
  • The softgels may melt together in hot temperatures

We were able to identify that the intake of Momentous L-Theanine Capsules enhanced our focus and alertness and not caffeine’s side effects. Thanks to Suntheanine formula that is patented the evident sense of relaxation and calmness throughout the day was achieved.

The supplement was easy to take because it was tasteless, and we noted it was made from non-GMO ingredients such as organic coconut oil. However, some users will not feel much boost in their alertness and concentration and the soft-gel capsules may fuse together in hot conditions.

All in all, we believe the Momentous L-Theanine Capsules is a perfect product for everyone who seeks for a natural way to improve attention and be awake during the day.


Nutricost L-Theanine 200mg

Nutricost L-Theanine 200mg

See price on Amazon

If you are looking for L-Theanine supplement of premium quality, there is Nutricost brand to think of. We would recommend this product a lot due to those qualities and the results it brings.

Pros

  • Double strength formula for maximum effectiveness
  • Non-GMO and gluten-free
  • Easy to take capsules

Cons

  • Some users complained of side effects such as headaches or dizziness
  • May take some time to notice the full effects

We are using Nutricost L-Theanine for a few weeks and I have observed a increased mood and decreased stress. The formulation of the double-strength means that we are getting the best value out of the product and the capsule form ensures a daily use with no hassle of chocking on it.

One of the things that we loved about this product is that it is non GMO and gluten free. This is useful to those persons experiencing lactose intolerance or those who prefer organic products.

However, we have not come across any side effects, but it is not uncommon for some users to experience some minor side effects like, headaches or dizziness and others. Further, the results of the supplement may not be observed immediately.


Sports Research L-Theanine Supplement

Sports Research L-Theanine Supplement

See price on Amazon

For something more natural, which is Sports research L-Theanine supplement that helps users to stay awake and focused without necessarily leading to caffeine side effects

Pros:

  • Promotes relaxation without drowsiness
  • Helps align the mind and focus
  • Easy to incorporate into a daily routine

Cons:

  • Results may vary
  • It is a bit expensive

This supplement has been a Godsend for us recently especially during those days when frustrations are at an all time high. Not many supplements with a similar composition are available in the market today and the special additive of L-Theanine, which is an amino acid extracted from tea leaves, helps to soothe the nerves and provide alertness that does not induce drowsiness. It’s like discovering a calm place in your mind and emotions in the middle of a rather crazy day.

We have been using it for the last few weeks and have realized that our concentrative and calm area has enhanced greatly even during the deadlines and lengthy ‘to do’ list. It is something like having support in every situation, always being prepared and having no stress even in the most worrying situation.


Double Wood Supplements L-Theanine Supplement

Double Wood Supplements L-Theanine Supplement

See price on Amazon

This is the perfect supplement for someone who wants to achieve relaxation without the effect of drowsiness that is associated with other supplements in the market.

Pros

  • Third party tested and made in the USA
  • It helps in the relaxation of muscles without resulting to the relaxation of the entire body as witnessed with barbiturates.
  • Non-GMO and gluten-free

Cons

  • Takes time to see results
  • Might not work for everyone

This L-Theanine supplement has been our go-to supplement for the past few weeks, and boy, have we seen a change? It was discovered that it aids in making us more refreshed without dazing us, perfect for the hours if we need to be awake and so lively.

Here are some of the outstanding features than make this supplement stand out for us; This supplement is third party tested and made in the USA. This relieves our conscience knowing that we are using a quality item that is safe for use and will complete the intended function.

Still, there is something that was satisfying about this supplement, and they are: The supplement is, of course, non-GMO and gluten-free. For this, it makes the ideal meal supplement for anyone who has dietary limitations or anyone who wants to avoid the negative side effects of most supplements.

This supplement may not work for all of you, but if you are looking for a natural way to ease stress then it is worth giving it a try. Yes just remember that it will take some time for you to get positive outcome so the wait will be long that is why always keep that in mind.


Z Factor: 100% Drug-Free Sleep Supplement

Z Factor: 100% Drug-Free Sleep Supplement

Order Z Factor Now!

If you are on the lookout for a reputable and natural sleep aid and supplement, then the Z Factor could be one you’d want to look into. With careful consideration and so much thought put into the production of Z Factor, people who have sleep issues would be sorted out in their entirety, and people would be able to wake up feeling more fresh and reloaded every morning.

Pros

  • It ensures that one has sound and continuous sleep without attracting the peril of becoming a dependent of sleeping pills.
  • Developed from pure natural extracts to produce a quieting action on the mind and the system.
  • Enhances the ability to maintain regular sleep-wake cycle which in its turn contributes to the overall night’s sleep.

Cons

  • Not recommended to those with specific allergies or sensitivities
  • Results may vary among users

A major factor that sets Z Factor apart from competitors can be said to be its responsibility of delivering a non-hook Night’s solution to sleepless issues. By avoiding the use of these products, it does away with the tendency of developing dependency, thus, providing the client with an added security other than a sound sleep. purest natural ingredients, Z Factor gradually sends you to slumber without causing discomfort or interrupting your body’s ability to have sound asleep.

An effective aspect of Z Factor is promotion of the general quality of sleep. In influencing realization of physiological sleep-wake cycle, it ensures that the body is able to wake up fully charged for the day’s activities.

However, it is not recommended to people with allergies and individual peculiarities of a diet. Although, many users have observed positive effects with the first use, others use the supplement to incorporate a long-term benefit because of the ‘high ameliorating properties.


Nature's Trove L-Theanine Supplement

Nature's Trove L-Theanine Supplement

See price on Amazon

If you like something that is a non-stimulating way of having more relaxant effects, perhaps, Nature’s Trove L-Theanine Supplement is for you.

Pros

  • Promotes relaxation without drowsiness
  • Restores a sense of calmness
  • Found naturally in green tea

Cons

  • Might not work for everyone
  • Some users complained of mild side effects

We have been taking this supplement for some time a and are satisfied with the outcome. It is a form of stress relief that doesn’t have the user feel sleepy or dizzy or even cause a blurring of the vision. We also like the aspect of having natural contents in the supplement formulas and also that it is produced in the United States in a GMP NSF Certified Facility.

Another thing that we always take into consideration about this supplement is that it is somehow convenient to use. The capsules are vegetable, and they are best taken without food or together with food. It is recommended that we take one capsule in the morning and the second one before sleep, but you can double up the agreed doses in order to satisfy the required volumes.

However, this supplement may not have the same effect on every person. Side effects that prevail and are often described by people include headache, upset stomach, etc. Also, to notice the effect, you have to use it constantly, so if you are not ready to dedicate constant effort, it will not work for you.


NOW Supplements, L-Theanine 200 mg with Inositol, Stress Management*, 120 Veg Capsules 120 Count (Pack of 1)

NOW Supplements, L-Theanine 200 mg with Inositol, Stress Management*, 120 Veg Capsules 120 Count (Pack of 1)

See price on Amazon

For people who are in seek of a natural product to take to ease the mind and improve the health of their cardiovascular system, NOW Supplements, L-Theanine 200 mg with Inositol is recommended.

Pros

  • Promotes relaxation without drowsiness
  • Supports healthy cardiovascular function
  • Comprises Inositol which plays a role in the functioning of brain and nerves.

Cons

  • May not work for everyone
  • Capsules may be too large to swallow

We have been taking NOW Supplements, L-Theanine 200 mg with Inositol for a few weeks now and stress has considerably reduced. It relaxes us without making us necessitating sleep which is such a plus to those who have to work throughout the day. We also like that it has Inositol that supports the healthy function of the brain and the nervous system.

However, this medication is not suitable for exposure to heat or sunlight due to melting/damage of the product hence proper storage is compulsory. Moreover, what is more beneficial for us may not be benefit for some people. Of course, some might also complain that the capsules are somewhat large to be swallowed within the throat.

Overall, NOW Supplements, L-Theanine 200 mg with Inositol is a natural supplement that you can take to help with stress and boost your heart’s health.


Doctor's Best L-Theanine

Doctor's Best L-Theanine

See price on Amazon

For a natural stress fighter and better nights’ sleep, Doctor’s Best L-Theanine would be ideal for the users.

Pros

  • The Suntheanine which is pure L-Theanine derived through the utilization of a patented process that replicates the natural formation of L-Theanine in the green tea plant.
  • L-Theanine supports the healthy state of mind and healthy relaxation during the day without interfere the wakefulness.
  • Contains amino acid which enhances the relaxing effect of the brain and enhances alertness that is not blended with drowsiness.

Cons

  • Exposure to heat or sunlight may lead to melting/damage of product.
  • The effects of L-Theanine may vary from person to person.

This is the first time we try Doctor’s Best L-Theanine for a couple of weeks and can already feel the difference in handling stress and anxiety. This supplement also makes it easier for us to put to bed at night and easily wake up feeling fresh in the morning without the effects of drowsiness.

The product’s formulation is in the form of a tablet that makes it easy to consume and does not have that unpleasant taste when swallowed. It is accepted that it does not contain GENETIC MODIFYATION and that it has no gluten thus making it the best product for the market. Besides, it is vegan-friendly which is also an added bonus.

All in all, Doctor’s Best L-Theanine is highly recommended to anyone desiring to select a natural product with the aim of alleviating stress and enhancing sleep.


Pure Encapsulations L-Theanine

Pure Encapsulations L-Theanine

See price on Amazon

For those seeking to purchase an amino acid supplement that enhances relaxation without the side effect of drowsiness, count on Pure Encapsulations L-Theanine

Pros

  • Supports stress moderation
  • High-quality ingredients
  • Supports nervous system

Cons

  • May be expensive for some
  • May not work for everyone

Pure Encapsulations L-Theanine is a very useful supplement when it comes to reducing stress and occasional anxiety. In the same sense, it could also help in moderation of Caffeine’s impacts in the central nervous system. It has a high-quality dilution, no added colours, fragrances and other unwanted elements that are usually added to other dog foods.

The price may be slightly high to some clients; nevertheless, this is because the product is of high quality. Also, it fits most people to use the supplement whereas for some it might not be effective.

In conclusion, we can say that Pure Encapsulations L-Theanine is a good product that will make you calm and stress-free.


Nature Made L-Theanine Chewable Tablets

Nature Made L-Theanine Chewable Tablets

See price on Amazon

We recommend Nature Made L-Theanine Chewable Tablets for people who seek a non-sleep inducing, quick acting stress relief supplement.

Pros

  • Works within 30 minutes to help relax
  • Delicious tropical fruit flavor
  • Completely free from any chemicals, and halal certified, vegetarian friendly

Cons

  • Some users may not like the taste
  • May not work for everyone

Nature Made L-Theanine Chewable Tablets is ideal for those that prefer drugs that act as a stress reliever within a short period. Thus, the tropical fruit taste is rather pleasant and, importantly, the preparation in the form of chewable tablets ensures its easy usage. What we observed was that, it brought relaxation without the drowsiness within the 30 minutes they took.

Moreover, the supplement is 100% drug free as well as using vegetarian ingredients is also a plus. Although it is a good and effective approach to employment, it does not favored by all. Some users may not like the taste of the medicine and the chewable form is not so liked by some consumers.

All in all, Nature Made L-Theanine Chewable Tablets are fitting for those individuals who are in search for the quick weed affect of stress supplement.


Superior Labs L-Theanine Supplement

Superior Labs L-Theanine Supplement

See price on Amazon

If you would like a safe natural way to get relaxed and, or in a better mood , we highly recommend the Superior Labs L-Theanine supplement.

Pros

  • Provides relaxation without inducing drowsiness
  • It comes with 90 vegetable capsules that are loaded with 250mg of pure L- Theanine.
  • Contains no synthetic additives, fillers, heavy metals, and adulterants

Cons

  • May not be effective for everyone
  • Some users complained of side effects such as headache or nausea

We have personally used this supplement and the result is that the signals given easily switch on relaxation but does not make us sleepy. We also like the fact that it has a blend of 250mg of pure L-Theanine in 90 vegetable capsules and this makes it fairly priced in the market.

We also noted the lack of synthetic compounds, which are always added to a product to improve its shelf-life; there are no artificial preservatives in this vitamin. In addition, all the products made at Superior Labs are produced in 3rd party certified NSF certified centres, this makes quality to be beyond any doubt.

This supplement may not suit everyone, however, it could be of a lot of help to those wanting a natural way to boost their mood and reduce stress. It is safe, but this may need 2-3 weeks to work, though some minor side effects may include headache, nausea, etc.


Integrative Therapeutics L-Theanine 200 mg

Integrative Therapeutics L-Theanine 200 mg

See price on Amazon

For a person who wants to have a natural supplement that would help them improve relaxation and a healthy stress response, Integrative Therapeutics L-Theanine 200 mg is desirable.

Pros

  • Aids in the promotion of better relaxation and a positive stress management.
  • It promotes a non-REM state which is associated with non-REM sleep but does not impair a person’s wakefulness during the day.
  • Lactose-free, soy-free as well as wheat, corn, any preservatives, flavors or colours added.

Cons

  • Might not be strong enough for some users..
  • Might take some time to see noticeable effects.

We have used Integrative Therapeutics L-Theanine 200 mg for some weeks now, and the stress has somewhat reduced. This supplement assists in encouraging a state of relaxation but at the same time, will not put me to sleep and make me feel tired in the day. We also appreciate that it is soy, dairy, wheat, corn and artificial additive-free product.

However, the effects may take some time before they are felt since the supplement gradually accumulates in your body. It is also important to note that some users also complained of stomach pains anytime they took capsules, in case you have an ulcer, consulting a doctor for a sublingual might be useful.

All in all, Integrative Therapeutics L-Theanine 200 mg may be stated as a suitable remedy for stress, which can be taken naturally without producing any kind of side effect. Just wait for a while for your skin to renew itself and react to this product.

Buying Guide

Dosage

The dosage of L-Theanine in a supplement is also a crucial factor of the supplement. For instance, it is recommended that a novice should commence with small doses then have to gradually advance to higher dosages. L-Theanine dosage can range from 250 to 400mg, a day, but it is advised to take as per the label instructions/ prescription.

Quality

As with any supplement it is vital to determine the quality of L-Theanine so that you are only using a safe and good product. Search for the products that are made in the GMP certified facility and contain the certificates of third-party verification of the supplements’ purity and potency.

Formulation

L-Theanine are available in form of capsules, tablets and also powders. Select a form that can easily fit your schedule and be taken without inconveniences. Also, various forms of L-Theanine can have other active substances like caffeine or melatonin which will also impact the effectiveness of the supplement. Always pay attention to the labels and select a supplement, which will suit you the best.

Frequently Asked Questions

1. What are the top-rated L-Theanine supplements in the market?

Some of the best L-Theanine brands available include the Momentous L-Theanine Capsules, 60 Servings, Nutricost L-Theanine, and Sports Research L-Theanine Supplement. These supplements are among the best ones available because they are efficient, of good quality and still fairly priced.

2. What is the recommended dosage for L-Theanine supplements?

The recommended dosage of L-Theanine supplements depend on one’s requirement where a certain quantity to be consumed at a time is prescribed. Nonetheless, a recommended amount normally falls in the region of 100mg to 400mg within one day. As a result, users should consider consulting a doctor to identify the right amount of the substance for their case.

3. Are there any side effects associated with L-Theanine supplements?

L-Theanine supplements are considered safe and generally have few side effects. Nonetheless, some of the side effects that most patients reported include headache, dizziness and gastrointestinal upset. It is advisable to get medical advice if any undesirable side effects are noted.

4. Can L-Theanine supplements help with ADHD symptoms?

L-Theanine may reduce many symptoms associated with ADHD and is recommended for hyperactivity, impulsiveness, and inattention. However, a number of studies are still required to see if L-Theanine supplements can be totally helpful in ADHD treatment.

5. What is the difference between L-Theanine and Suntheanine?

Suntheanine specifically is the L-Theanine that has undergone fermentation. It is believed to be doubly effective to the base L-Theanine, which is being sold in the market today. It is noteworthy, however, that all the beneficial effects of L-Theanine and Suntheanine are equally possible.

6. Which brand of L-Theanine supplement is the most effective?

L-Theanine supplements basically work differently for different people, so the effectiveness depends on the dosage and the customer’s requirements. Some of the top quality brands of L-Theanine supplements that are available for purchase are NOW Foods L-Theanine, Jarrow Formulas L-Theanine and Life Extension L-Theanine brands. To be precise, one should consult with a healthcare provider to identify the most suitable brand for your case.

Affiliate Disclosure:
The links provided may earn us a small commission at no additional cost to you if you choose to purchase the recommended product. This support allows our research and editorial team to continue providing high-quality recommendations. As a participant in the Amazon Services LLC Associates Program, an affiliate advertising initiative, we are able to earn advertising fees through providing links to products on Amazon.com. Please rest assured that we only recommend high-quality products.