L-Theanine Capsules | 200mg

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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 | 200mg
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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 a non-proteinogenic amino acids and 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: These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.


67 Reviews

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  • 5
    Great Product

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

  • 5
    It works!

    Love taking theanine and the quality from ND is outstanding.

67 Reviews

  • 5
    Great Product

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

  • 5
    It works!

    Love taking theanine and the quality from ND is outstanding.

  • 5
    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.

  • 5
    High quality

    Effective. Just wondering why they add dextrose.

  • 5
    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.

  • 5
    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.

  • 5
    Great stuff

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

  • 5
    As expected

    as expected

  • 5
    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.

  • 5
    Good stuff

    Works like a charm. Lovely with some caffeine.

  • 4
    Goes well with morning coffee

    And helps with falling asleep!

  • 5
    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!

  • 5
    Excellent Theanine

    I like that the capsules are 200mg rather than 100mg and the potency is good. A good value

  • 5
    Good product, a little expensive on the shipping

    The L-theanine was good. The shipping cost was high but the total cost was less than my last supplier. It shipped and arrived quick.

  • 5

    It helps my wife shut down her mind while trying to sleep. She uses 400 - 600 mg 5 days a week and phenibut twice per week. Both have help her sleep and fall back asleep if she wakes up in the middle of the night.

  • 5
    Mild Calming Effect

    Mild calming effect without side effects

  • 4
    Great starter nootropic. Go for the theanine+caffeine pills instead

    They don't do much other than relax you (a little too much lol) if taken by themselves so definitely buy caffeine pills along with them. Easier to just get the theanine+caffeine pill combo. I take them for improving my mindful meditation practice, and overall having a baller day. A gentle

  • 5
    Great Product

    Usually take multiple times a day. Subtle but calming and helps me sleep as well

  • 4
    Works sometimes

    Works on some days. Good product though.

  • 5

    When taken with 50-100mg caffeine. quite remarkable, but I do take sparingly.

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