L-Theanine 200mg Capsules

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90ct or 180ct
90 Servings or 180 Servings
As a dietary supplement, take one 200mg L-Theanine capsule daily.
Store in a cool and dry place. Keep away from direct sunlight and heat.
Keep out of reach of children. Do not take this or any other supplement if under the age of 18, pregnant or nursing a baby, or if you have any known or suspected medical conditions, and/or taking prescription drugs or over the counter medications.
Always consult with a qualified health physician before taking any new dietary supplement. This product is not intended to diagnose, treat, cure, or prevent any diseases. These statements have not been evaluated by the Food and Drug Administration.

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L-theanine Capsules

What is L-Theanine?

First discovered as a constituent of green tea leaves (Camellia sinensis) in 1949. L-Theanine is an amino acid analogue of the proteinogenic amino acids L-glutamate and L-glutamine. L-Theanine is considered a nondietary amino acid, not unlike L-Ornithine or L-Citrulline. L-Theanine is primarily known for its ability to promote relaxation without causing sleep and is often paired with Caffeine. It is thought that L-Theanine helps balance the negative effects of Caffeine that some people experience. Together, L-theanine and Caffeine are considered one of the most commonly used and popular nootropic stack options that may promote faster reaction time, numeric working memory reaction time and improved sentence verification accuracy.

L-Theanine Benefits and Uses

L-Theanine benefits and uses may include:

  • Promotes relaxation
  • Support healthy sleep cycles
  • Support healthy stress levels
  • Promote feelings of well-being
  • Support cognitive function and focus
  • Synergistic effects with Caffeine

L-Theanine Studies

L-Theanine may have positive mood-boosting effects as scientists have discovered that it changes levels of amino acids affecting serotonin and other neurotransmitters in the brain. L-Theanine may also help suppress glucocorticoids. Glucocorticoids are stress hormones that can have a negative effect on mood, memory and learning. L-Theanine may act as a glutamate antagonist and, in turn, balance the harmful effects of high glucocorticoid levels. This also suggests that L-Theanine may be neuroprotective as well. 

Additionally, L-Theanine may promote better sleep. One Japanese human study where participants were given a daily L-Theanine supplement concluded that L-Theanine did not induce sleep or make them sleep longer - but rather that it improved sleep quality. Documented participant responses claimed that exhaustion recovery and feelings of being refreshed were enhanced by L-Theanine.

L-Theanine supplementation has been studied for its potential ability to reduce mental and physical stress, improve cognition, and boost mood and cognitive performance. It is also reported to promote alpha wave production in the brain. One study conducted by Unilever was able to confirm that even small amounts of L-Theanine were able to promote alpha wave production as indicated on an EEG (Electroencephalography). 

L-Theanine Dosage

As a dietary supplement, take one 200mg L-Theanine capsule daily.

L-Theanine may be synergistic with Green Tea Extract

Where to buy L-Theanine Capsules

Nootropics Depot offers 90ct. or 180ct. jars of high quality L-Theanine Capsules (200mg). Nootropics Depot's L-Theanine has been lab-tested and verified for both product purity and identity. L-Theanine has been granted GRAS (generally recognized as safe) status in the United States. 

You may also be interested in L-Theanine Free Form Powder or Caffeine L-Theanine Capsules.

To learn more, read the L-Theanine reviews and experiences below.

Scientific name: Gamma-ethylamino-L-glutamic acid

Attention: This product is not intended to diagnose, treat, cure, or prevent any disease. It has not been approved, nor have these statements been evaluated, by the FDA.


54 Reviews

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  • Gilbert Maxey - 10th May 2021

    L-Theanine 200mg Capsules

    Excellent Nootropic for relaxing and stress-free evening and combined with Melatonin leads to a very good sleep cycle.

  • Tom - 10th May 2021


    Excellent product for an anxious household.

54 Reviews

  • Gilbert Maxey - 10th May 2021

    L-Theanine 200mg Capsules

    Excellent Nootropic for relaxing and stress-free evening and combined with Melatonin leads to a very good sleep cycle.

  • Tom - 10th May 2021


    Excellent product for an anxious household.

  • David - 3rd May 2021


    Good product overall.

  • Remy - 26th Apr 2021

    Consistent quality

    Incredibly high and consistent quality. For the amount, it's also way cheaper than anything on Amazon or other sites.

  • SC - 15th Apr 2021


    Always good and consistent Quality Theanine.

  • Ajay Kotian - 13th Apr 2021

    Awesome stuff!

    Top-notch and high-quality product.

  • Niko - 5th Apr 2021

    Good Quality and Very Affordable

    Works just as well as other L-Theanine products sold elsewhere and is cheaper too.

  • Joslyn Medrano - 22nd Mar 2021

    Great stuff all around!

    Hubby and I take this supplement often. A few years now. It has helped out a lot. That little extra kick in energy and mental focus is great. I take mine with coffee in the morning a few days a week. Really helps cure the Mondays. Clear minded and ready for solutions with this one.

  • Paul - 19th Feb 2021

    Nothing I thought it would be

    After reading lots and lots of very great reviews and people saying it either changed their life or did nothing, I thought I'd try my shot. This thing only makes me light headed and kind of prevent me from thinking straight. I can't work normaly after taking this and it has no significant impact on my anxiety (coffee driven or not). I also noticed I felt somewhat more emotional after taking it. And I'm a bit more social, in the sense that I talk more to people. I was expecting either good or no benefit from taking it, knowing everyone can't react the exact same way, but this is pretty bad for me. Maybe it'll work for you, there's countless people saying how much it was a godsent for them, just wasnt my thing.

  • Matthew - 8th Feb 2021

    Great for relaxation and synergy

    L-Theanine stacks well with caffeine or goes great on it's own, good for sleep also

  • Patrick Miller - 12th Dec 2020

    Worked great!

    I’m new to nootropics depot. And I’ve had a previous l-theanine product from another brand that failed utterly. I’ve heard nothing but good things from reddit about this brand. The product worked out great! I felt it immediately after taking it and even gave my anxious mother a few.

  • Jason Leighton - 4th Dec 2020

    Great Product from a Great Company

    I take 400mg at night and it helps to ease me to sleep and helps keep me asleep all night. Before i started taking this i would wake up all night and wouldn't get a full nights sleep. This stuff has been some of the only stuff that seems to work. It also helps to relax you, ease stress, and gives you a calm focus. The dose i take is more for sleep so i wouldn't recommend anyone to take 400mg unless you want it to help ease you to sleep

  • Daria Ratliff - 18th Oct 2020

    Works wonders if paired with Cognizin and Magtein

    I wrote an extensive review about Magtein and Cognizin that relates to this product. Seems like the two initial supplements above went to another level after I added L-Theanine. This stack works really well for memory, but I felt like L-Theanine really improved my energy endurance during the day. Very, very pleased!

  • Anon buyer - 10th Aug 2020

    I've reviewed this before

    And I will review this again; The best L-Theanine on the market that I have found and a great price.

  • Tracy - 10th Jun 2020


    I read the reviews on L-theanine and decided to give it a try. As a mom with 5 kids, I never know what life is going to throw at me. I started BioTe identicals and had great success with hormonal imbalance that started the ball rolling on helping me not be irritated, anxious all the time, etc... I added L-theanine after reading the reviews and the anxiousness in the pit of my stomach is now GONE! I take one in the morning with coffee and one in the evening before bedtime - and I can back off when things are calm and smooth and start back up when I am agitated or getting anxious.. The most amazing thing is that I can handle what stresses are thrown at me without becoming anxious! I DO make better choices (with meals, etc) on L-theanine, maybe because my brain that usually travels at 200mph (and normal people at 60mph) is slowed down so I’m not as impulsive and I can think clearer. It is quite an amazing capsule that I will continue to take loyally! VERY impressed! My mood is calm and breezy on this - I think my kids like it the most for me! haha!

  • Calcul - 24th May 2020

    Green tea amino acid packs a punch

    Some solid research regarding this supplement, its a great, safe addition to your stack

  • Dylan Shannon - 15th Apr 2020


    This is really great stuff. I take two a day with fish oil and coffee and feel much, much better than coffee alone. Highly recommend.

  • Stuart - 13th Apr 2020

    Highly recommend

    I really like this supplement as it gives me a calm yet alert state of mind throughout the day. It practically eliminates any brain fog I may feel and gives me a smooth (no jitteriness) form of energy and focus for many hours on end!

  • Clyde - 7th Apr 2020


    This has helped the long term effects of withdrawal from other GABAergics. Onset is slow and gentle, and I have noticed no rebound effect. For me, more than 200 mg per evening can result in effect continuing into the following day.

  • Unknown - 2nd Mar 2020

    l-theanine 200 mg caps

    Paired with 8 ox of cold brew, ND's l-theanine helps to get my workouts happening just as well as the more expensive brand I'd been using.

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