L-Theanine 200mg Capsules

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  • L-Theanine 200mg Capsules
  • L-Theanine 200mg Capsules
  • 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.


35 Reviews

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  • 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.

  • Izaak Wolfe - 7th Feb 2020


    This compound makes almost any stack possible ! great and essential stuff for neurohacking.

35 Reviews

  • 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.

  • Izaak Wolfe - 7th Feb 2020


    This compound makes almost any stack possible ! great and essential stuff for neurohacking.

  • Mark - 10th Jan 2020

    Has been extremely helpful

    This gives me the calm and sense of focus I've been looking for. Great product that I will continue buying.

  • Joseph - 10th Dec 2019

    Fantastic combo with caffeine.

    This supplement is great for stacking with caffeine. Reduces and eliminates jitteriness associated with high caffeine doses. Keeps you extremely alert without feeling like bouncing off the walls.
    Also great on it's own. I utilized this prior to going to large events and family gatherings and it worked wonders regulating anxious feelings and allowing me to enjoy myself.
    Highly recommended.

  • Ryan James - 1st Nov 2019

    Works to what I wanted it to work for.

    Stops racing negative thoughts from appearing. In theory that should help you focus more.

  • Joaquin Dorantes - 10th Oct 2019

    anxiousness reduction

    moderately effective

  • Lisa - 12th Sep 2019

    It Helps

    Before I purchased this product. I read it helps with focus and memory as well. I’m studying for a certification. I was really hoping this product would help me focus and it hasn’t helped :(. I’ve been taking this product for over a month now. The only thing I have noticed is I’m in better mood. I take one pill with a cup of coffee every morning. Can I take another one in the mid afternoon ? What would you recommended to take to help me focus while I study? Can some one please email me back.

  • David Winslett - 29th May 2019

    Works Well

    I definitely feel the difference. Very good when fasting it takes the edge off.

  • Kurt - 3rd May 2019

    Great Product

    Worked better than expected - definitely helps provide a calming feeling. A great combo with other nootropics.

  • InnaVW - 24th Mar 2019

    It works!

    Love taking theanine and the quality from ND is outstanding.

  • Perhaps Stressed - 16th Jan 2019

    Works for me

    Previously, I used Suntheanine and this works just as well if not better. I usually take 1 capsule when I am drinking a lot of caffeinated beverages and then another one when I feel the effects fade. (Caffeine has a longer half-life than L-theanine).

    Around Christmas I was not sleeping very well. I got a Mi Band 3 as a gift and it has a basic sleep tracker. It confirmed that I was not getting enough deep sleep. And no, I was not drinking caffeinated beverages close to bed. In fact I do not drink coffee, tea only few times a year, energy drinks more often but when I drink caffeinated sodas (few times a week at most) I tend to drink 30-50oz.
    I was alarmed when I saw that my poor sleep was not getting better. I wondered if I had always had bad sleep and was only realizing it now because of the sleep tracker?
    Amidst all this I remember reading how L-theanine can help with sleep. Why not, I thought?

    Next morning I woke up feeling better. Placebo, I thought. Thank god for placebo! Later in the day I sync my wrist band to the Mi Fit app. My deep sleep was nearly doubled!
    The charts show a lot of deep sleep during my first 4 hours of sleep.
    I sometimes forget to take 1 before bed but my sleep is still decent.

    This really helps to reduce stress.

  • Unknown - 21st Dec 2018

    High quality

    Effective. Just wondering why they add dextrose.

  • Jess P - 23rd Sep 2018

    Highly Recomend!

    This is an excellant product for relaxation and sleep. I even got one for a coworker and she is finally sleeping through the night for the first time in years. It helps me relax when I'm anxious.

  • Unknown - 5th Sep 2018

    perfect complement to caffeine

    I take one everyday with a cup of coffee. It helps take away agitation of caffeine, leaving energy and increased focus. These are top quality.

  • Danielle - 17th Aug 2018

    Great stuff

    Great price, great quality. Very happy with this and will order again.

  • Brian G - 17th May 2018

    As expected

    as expected

  • Unknown - 17th May 2018

    Comedown plan

    Sometimes I like to drink a soda, or a coffee, etc.
    I enjoy these things, but even a single glass of Coke can be a productivity killer for me. I've been using these capsules as a mitigation tool and they work fantastically. Now I can have my caffeinated drinks knowing that if I turn into a hyperactive mess, I have something to bring me back to focus.

    They're great on their own too if you can't relax but want to. To me, the feeling is close to what I feel after meditation. It's not as intense but it last much much longer. A prolonged sense of relaxation.

  • Unknown - 16th May 2018

    Good stuff

    Works like a charm. Lovely with some caffeine.

  • John Lewis - 4th Apr 2018

    Goes well with morning coffee

    And helps with falling asleep!

  • Mohamed Al-Ali - 23rd Mar 2018

    great natural remedy, bonus is enhanced cognition

    i first tried l-theanine in the hyped caffeine/theanine synergy and i liked its affect. i decided to give l-theanine a shot on its own without the caffeine and i was amazed by the results. it gave me a nice, calm, clean sort of feeling that wasn't causing me drowsiness/sleepiness in any sort.

    i started taking 200mg daily in the morning with my coffee and felt the synergistic effect much better with my low-caffeine coffee than that with the 100mg caffeine, and eventually started taking another 200mg dose in the evening. sometimes i would take 3x to a total of 600mg in one day.

    thank you guys!