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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 may include:
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).
As a dietary supplement, take one 200mg L-Theanine capsule daily.
L-Theanine may be synergistic with Green Tea Extract.
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.
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.
I like that the capsules are 200mg rather than 100mg and the potency is good. A good value Unknown on 21st Feb 2018
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. Unknown on 9th Feb 2018
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. Unknown on 10th Jan 2018
Mild calming effect without side effects John on 31st Dec 2017
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 Unknown on 3rd Nov 2017
Usually take multiple times a day. Subtle but calming and helps me sleep as well SS on 28th Aug 2017
Works on some days. Good product though. Unknown on 23rd Jun 2017
When taken with 50-100mg caffeine. quite remarkable, but I do take sparingly. sg on 31st May 2017
ND's L-theanine has the expected umami taste and gives a calm mind. My wife regularly takes this at bedtime and wakes up well rested allowing her to function optimally during the daytime. Marc Boucher on 31st May 2017
Have this with my morning coffee for clean no jitter energy. ck on 17th Apr 2017