Category Archives: L-theanine

L-Theanine for Attention deficit hyperactivity Disorder 

Posted on August 26, 2024 by Robert Barrington

L-theanine is an amino acid found in tea. Evidence suggests that it can partially activate the N-methyl-D-aspartate (NMDA) glutamate receptor in humans and animals and that this causes a reduction in excitation in the brain along with a concomitant increase … Continue reading →

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L-Theanine

Posted on August 23, 2024 by Robert Barrington

L-theanine is a non-proteinaceous amino acid that has interesting nutritional properties. One of the most interesting things about L-theanine is that it is only found in tea. The chemical name for L-theanine is γ-ethylamino-L-glutamic, and this gives a clue as … Continue reading →

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L-Theanine: Hormonal Effects

Posted on June 10, 2024 by Robert Barrington

Evidence suggests that green tea can inhibit steroidogenesis and may decrease testosterone levels in rats. However, it is not clear if this effect is common to humans, or whether there are special considerations regarding the methods of the studies that … Continue reading →

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Tea (Camellia sinensis) and Anxiety

Posted on April 18, 2024 by Robert Barrington

Tea (Camellia sinensis) has a large body of research supporting its various health effects. These effects relate to the presence of a number of different phytochemicals within tea including flavonoids, the amino acid L-theanine and a number of methylxanthines including … Continue reading →

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L-Theanine and the Brain

Posted on March 21, 2024 by Robert Barrington

L-theanine (N-ethyl-L-glutamine) is a non-proteinaceous amino acid that is found in high amounts almost exclusively in tea (Camellia sinensis). In fact, L-theanine accounts for around 50 % of the amino acids in tea leaves. L-theanine is structurally similar to glutamic … Continue reading →

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Why Does Tea Create Calmness?

Posted on January 26, 2024 by Robert Barrington

Tea is known to induce a state of calmness and this is verified through both anecdotal and empirical evidence. The reason for this may be sereralfold, but one of the main mechanisms is suggested to be the fact that tea … Continue reading →

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L-theanine: Psychotropic Effects?

Posted on December 6, 2023 by Robert Barrington

L-Theanine (N-ethyl-L-glutamine) is a non-essential non-proteinaceous amino acid that is found in its free form in tea. Evidence suggests that L-theanine from tea or in supplements is able to cause relaxation by induction of alpha wave states in the brain. … Continue reading →

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L-Theanine to Reduce Stress

Posted on November 27, 2023 by Robert Barrington

L-theanine is a non-essential amino acid that is found in tea leaves in high concentrations. L-theanine passes across the blood brain barrier easily and in the brain it can have physiological effects. In particular, L-theanine is known to block the … Continue reading →

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L-Theanine: Health Effects

Posted on June 8, 2023 by Robert Barrington

Green tea has a number of health effects and these effects relate to the phytochemicals within the Camellia sinensis (tea) plant. One important constituent of green tea is the amino acid L-theanine. In animals, L-theanine is absorbed across the gut … Continue reading →

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Glycine and L-Theanine for Rest and Focus (The NMDA Receptor)

Posted on October 11, 2022 by Robert Barrington
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