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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.
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
I've tried a few different sources of l-theanine, and I take it regularly. One in the morning with a stimulant, and with alcohol to mitigate the hangover. The l-theanine caps from nootropics depot do not disappoint. Ty A Donald on 13th Mar 2017
Potent product and a fair price on top of it. Actually domestic options for me are much more pricey without much guaranty about potency. Unknown on 9th Nov 2016
This product and the other product I purchased from Nootropics Depot (KSM-66) are extremely potent. Specifically referencing the L-Theanine, it is the most potent formula I have ever used, more potent than Suntheanine product I have tried from Amazon. Unknown on 27th Oct 2016
Theanine helps wiht focus, lightens the "negative" effects of caffiene, and can help you relax or even feel more rested if taken before bed. Its a really good deal price wise, especially if you take advantage of the $50+ free shipping in USA. Great add on to any stack. no cons, only pros. Unknown on 18th Oct 2016
I ordered this from Colombia and, so far, I'm satisfied with the results. L-theanine relax you, but it doesn't make your mind fuzzy. I totally recommend it. Unknown on 22nd Aug 2016