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Theanine
Theanine
Specific Recommendations:
News & Research:
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L-theanine may boost attention for anxious folks: Study - Nutra USA, 5/11/11
- "L-theanine, an amino acid found in tea leaves, is thought to help reduce
stress, promote relaxation and improve the quality of sleep. L-theanine is found
in tea leaves in low concentrations (less than 2 percent), which means that
effective dosage levels (of 100 – 200mg/day) cannot be delivered from drinking
tea ... Student with high anxiety were put in one group, while students with
minimal anxiety were put in another group. Both groups received water or water
plus 200 mg of L-theanine per 100 ml of water. The test was performed repeatedly
and assessments performed between 15 and 60 minutes after ingestion ... Results
showed that highly anxious students receiving the L-theanine displayed a slowing
of their heart rate, improved attentional performance, and better reaction
times, compared to members of the same group receiving placebo ... It is
noteworthy to mention that unlike other conventional anti-anxiety treatments,
L-theanine did not result in increased drowsiness, slowed reflexes, or impaired
concentration ... Results of a present study showed that ingestion of 200 mg of
L-theanine changes the electrical activity in the brain by increasing alpha
electric band measured by EEG" - See Jarrow Formulas, Theanine 200
at iHerb.
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Tea compounds may boost attention span: Unilever - Nutra USA, 1/19/10 -
"This study provided further evidence that the
L-theanine/caffeine combination improves attention on the switch task ... The
improvement in accuracy in combination with unaltered response speed is in line
with previous studies ... Tentative evidence was [also] found that the effect of
the L-theanine/caffeine combination on attention is not specific to the visual
modality, as we found faster responses in both the visual and auditory modality
on the intersensory task after the combination as compared to placebo ... Taken
together with the previous studies, we conclude that a high dose of L-theanine
combined with caffeine, at the level of a single cup of tea, can help to improve
attention" - [Abstract]
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L-theanine and caffeine improve task switching but not intersensory attention or
subjective alertness - Appetite. 2010 Jan 13 - "The
results support previous evidence that L-theanine and caffeine in combination
can improve attention"
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Green,
Black Tea Can Reduce Stroke Risk, Research Suggests - Science Daily, 3/4/09
- "By drinking three cups of tea a day, the risk of a
stroke was reduced by 21 percent. It didn't
matter if it was green or black tea ... the effect appears to be linear ...
researchers have speculated that the antioxidant
epigallocatechin gallate (EGCG) or the amino acid
theanine may be what helps. Antioxidants are
believed to help prevent coronary artery disease ... we do know that theanine is
nearly 100-percent absorbed .... It gets across the blood-brain barrier and it
looks a lot like a molecule that's very similar to
glutamate, and glutamate release is associated with stroke" - See
Jarrow green tea extract at iHerb
and Jarrow Formulas, Theanine 200.
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L-Theanine: the
Next Supplement Superstar - Dr. Murray's Natural Living, 9/20/06
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Are You Easily Distracted? Try Some Tea - US News and World Report, 10/8/07
- "the amino acid theanine, which is found in green,
black, and oolong teas, causes a decrease in the brain's "alpha rhythms" when
people perform complex attention tasks, causing them to pay closer attention.
His ongoing research, funded by the food and beverage conglomerate Unilever,
suggests that theanine and caffeine together improve performance more than
either substance alone ... in mice, at least—tea's main antioxidant shows an
ability to curb brain cell death and encourage neurons to repair themselves"
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Theanine - Natural Support for Sleep, Mood, and Weight
- Life Extension Magazine, 1/06 -
"Preliminary studies show that blocking certain signals in the brain
activated by glutamate may be as effective as prescription
antidepressants.36,37 L-theanine may act as a glutamate antagonist.38
Researchers believe that glutamate receptor antagonists may offset the
harmful effects of high glucocorticoid levels and offer neuroprotective
effects against both acute and chronic neurodegenerative diseases"
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Natural remedies ease anxiety - Natural Food Merchandiser, 10/05 -
"Relora ... L-theanine ...
Phosphatidylserine"
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Wrong form of theanine interferes with absorption - Nutra USA, 5/10/05
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Sleep easy with green tea - Nutra USA, 3/16/04 - "200mg of L-theanine or a placebo ... all subjects reported a significant absence of feeling exhausted and a
reduced need for sleep when administered with the L-theanine, compared to the placebo"
- An
Anti-Anxiety Agent in Tea? - Dr. Weil, 3/11/04
- Health Benefit of Tea: Add Immune Boost That Helps Fight Germs - WebMD, 4/21/03
- Stress, Cortisol and Health - Supplement Watch Newsletter, 10/02 -
"several lines of evidence have converged to solidify the concept that
stress makes us fat (because of cortisol), thins our bones (because of cortisol), shrinks our brains (because of cortisol), suppresses our immune system (because of cortisol), saps our energy levels (because of cortisol), and kills our sex drive (because of cortisol) ... Take a daily
multivitamin/multi-mineral supplement - because calcium, magnesium, vitamin C and B-complex vitamins are needed for a proper stress response ... Chief among the supplements with documented
cortisol-controlling effects are Phosphatidylserine, Beta-sitosterol, Magnolia bark, Theanine, Epimedium, Ashwagandha and
Passionflower"
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Theanine
Enhances Chemotherapy And Reduces Side Effects - Life Extension Magazine, 7/02
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The
Ultimate Relaxant - Life Extension Magazine, 1/02 -
"Theanine is an amino acid found in green tea. It helps to produce a calming effect in the brain and induces a feeling of relaxation and well-being. Best of all, it does all of this without causing drowsiness. In fact,
studies have shown that theanine enhances the ability to learn and remember. One of the other benefits of this amino acid is that it helps to lower blood pressure naturally, by enhancing GABA in the
brain"
-
A
New Natural Relaxant - Life Extension Magazine, 10/01 -
"Theanine readily crosses the blood-brain barrier of humans and exerts subtle changes in biochemistry. An increase in alpha waves has been documented, and the effect has been compared to getting a massage or taking a
hot bath. Theanine is different than kava-kava in that it doesn’t cause drowsiness. And unlike tranquilizing drugs, it doesn’t interfere with the ability to think ... Theanine increases GABA, while caffeine decreases it.
GABA doesn’t just relax, it also creates a sense of well-being. Theanine’s ability to increase this brain
chemical can put you in a better mood by changing biochemistry. Theanine also increases levels of dopamine, another brain chemical with mood-enhancing effects"
- Shelf Stockers for 2001 - Nutrition Science News, 1/01 -
"The mechanism involved appears to be the way theanine affects the metabolism
or the release of the neurotransmitters dopamine and serotonin"
- Nutraceutical of the Year - Nutrition Science News, 9/00
Abstracts:
-
Green tea extract shows memory boosting activity: Study - Nutra USA, 5/4/11
- "A combination of a green tea extract with L-theanine was associated with
improvements in immediate and delayed recall, and general memory, according to
findings published in the Journal of Medicinal Foods ... As a natural ingredient
with a long history of consumption, LGNC-07 [ – a combination of green tea
extract and L-theanine - ] should be considered as a potential nutraceutical
candidate for enhancing cognitive performance" - [Abstract]
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Antidepressant-like Effects of L-theanine in the Forced Swim and Tail Suspension
Tests in Mice - Phytother Res. 2011 Mar 21 - "L-theanine (γ-glutamylethylamide),
an amino acid component of green tea, has been shown to reduce mental and
physical stress, and to improve memory function. In this study, the
antidepressant effect of L-theanine was investigated in mice using the forced
swim test, tail suspension test, open-field test and reserpine test. L-theanine
produced an antidepressant-like effect, since the administration of L-theanine
at doses of 1, 4 and 20 mg/kg for 10 successive days significantly reduced the
immobility time in both the forced swim test and tail suspension test, compared
with the control group, without accompanying changes in ambulation in the
open-field test. Moreover, L-theanine significantly antagonized reserpine-induced
ptosis and hypothermia. Taken together, these results indicate that L-theanine
possessed an antidepressant-like effect in mice, which may be mediated by the
central monoaminergic neurotransmitter system"
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Neuroprotective effects of the green tea components theanine and catechins - Biol Pharm Bull 2002 Dec;25(12):1513-8
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