Doctor's Best L-Theanine 150 Mg 90 Vegetarian Capsules

Suntheanine®, L-Theanine 150mg 90VC Science-based nutrition Dietary supplement Promotes a relaxed state without drowsiness* Eases stress and everyday nervous tension* Promotes a positive mood and alertness*  Suntheanine® is the premier, patented form of the amino acid L-theanine. Suntheanine® is the purest form of the L-theanine on the market today. L-theanine is an amino acid derived from green tea that is responsible for the relaxation-inducing effect of team consumption. Suntheanine® has been shown to promote an alert state of relaxation. This is characterized by an increase in alpha brain waves (signifying a relaxed, alert state) and a decrease in beta brain waves (signifying an awake, excited state of mind).* Suntheanine® may also improve sleep quality, enhance mental acuity and soothe away tension and nervousness.*   SUPPLEMENT FACTS -------------------------------------------------------------------------------------------- Servings Size: 1 capsuleServings per Container: 90 servingsAmount Per Serving            %DV-------------------------------------------------------------------------------------------- Suntheanine® L-theanine                                            150mg                 †--------------------------------------------------------------------------------------------† Daily Value not established.   Other Ingredients: Rice powder, modified cellulose (vegetarian capsule).   Suggested Adult Use: Take 1 capsule daily away from food, or as directed by a nutritionally informed physician. Suntheanine® L-Theanine contains 100% Suntheanine®, a patented pure form of the amino acid L-theanine produced in Japan from green tea leaves. This award-winning brand of theanine has been the subject of numerous safety studies and human clinical trials. One of green tea’s natural health-promoting compounds, L-theanine (?-glutamylethylamide) is synthesized in the roots of tea plants and transported to the leaves, comprising about 2% of the total dry weight of green tea leaves. It is the ingredient that is responsible for both the taste and the relaxing effects of green tea. Research shows that supplemental L-theanine crosses the blood-brain barrier within 30 minutes of intake and thus is able to exert its effects directly on the brain 1. - See more at: http://www.drbvitamins.com/products/suntheanine_ltheanine_150mg_90vc#sthash.EhFmOV4W.isquLo2x.dpuf Promotes a relaxed state without drowsiness* Suntheanine® L-theanine is best known for its unique ability to promote relaxation without causing drowsiness. Evidence from animal studies sheds light on this seemingly counterintuitive effect of this unique tea-based amino acid. L-theanine administered to rats by IV in relatively higher doses following the administration of approximately the same dose of caffeine has been shown to blunt the stimulating effects of caffeine as assessed by EEG recordings. However, L-theanine administered in smaller doses on its own resulted in excitatory stimulation. This reported dual action of theanine was shown to be dependent on the dose administered 2. Additionally, there are many anecdotal reports of L-theanine simultaneously enhancing mental alertness, and some, though not all, preliminary research in humans confirms this. Previous studies showed that Suntheanine® L-theanine promotes alpha brain waves, traditionally interpreted as signifying a relaxed, alert state. In a randomized, placebo-controlled, crossover study comparing placebo, 50 mg and 200 mg L-theanine, the higher dose of L-theanine increased power in the alpha frequency band (8-13Hz) of the electroencephalogram across parietal and occipital areas of the brain relative to placebo. The alpha brain waves in the resting human volunteers were generated within 40 minutes after the oral administration of L-theanine (50–200 mg), signifying a state of relaxation without drowsiness, according to the study authors 3.A study performed at the Brain and Cognition Laboratory at Oxford University investigated whether a lower dose of Suntheanine® L-theanine (50 mg) dissolved in tea would also affect alpha brain wave activity. The Suntheanine® group consisted of 16 participants who received 50 mg of Suntheanine® dissolved in a tea infusion, presumably containing caffeine. The control group consisted of 19 participants who received 100 mL cool water. EEG readings were taken 45 minutes after ingestion and subsequently every 15 minutes (45, 60,75, 90, 105 minutes). Participants were resting with their eyes closed during EEG recording. There was a greater increase in alpha activity across time in the Suntheanine® supplemented group relative to placebo (p<0.05) indicating that this lower dose of L-theanine may also have a significant effect on the feeling of relaxation 1.  May enhance cognitive performance and promote attention to detail* Studies have been performed in which L-theanine was administered to rats daily for four months to assess its effect on memory and learning ability. Several tests were employed to determine whether L-theanine could enhance memory and learning, including the Operant test in which food is released when the correct lever is pushed and a light comes on. L-theanine administration to rats resulted in a greater frequency of correct responses when compared to rats in the control group. In this experiment, the longer the L-theanine was administered, the better the response to the task. Additional tests performed on these animals included the passive and active avoidance tests. The idea here is that the animals develop the memory ability to avoid an undesirable outcome. The groups of animals receiving L-theanine again outperformed the control groups by exhibiting a greater ability to avoid undesirable events 3. These results demonstrate the memory and learning enhancement effects of L-theanine.Furthermore, it seems clear that one of the mechanisms by which L-theanine supports cognitive health is through its potential antioxidant support for brain cells. Several laboratory investigations point to L-theanine’s ability to support the health of neurons in the face of induced oxidative stress. In one such experiment, cultured rat neurons were exposed to glutamic acid, resulting in significant cellular death. When these cells were simultaneously exposed to L-theanine, the cell death was suppressed 4. This antioxidant effect may yield a partial glimpse into Suntheanine®’s cognitive performance-enhancing actions.Suntheanine® L-theanine clearly affects brain activity and is relatively fast acting; however, many of the mechanisms of how it supports cognitive health and brain performance in humans remain to be fully determined. More recent human clinical studies (2008) have discovered that the effects of L-theanine on alpha waves are likely both dose- and caffeine- dependent, as well as dependent on whether the user is in a resting state or actively performing an attention-demanding task. This emerging research indicates that when a large dose of L-theanine is ingested by itself or when it is ingested in combination with caffeine, L-theanine actually decreases background alpha activity, but promotes attention-related alpha brain wave processes during difficult attention-demanding tasks. This decrease in background alpha is associated with significant enhancement of one’s ability to actively perform tasks demanding a great deal of attention 6-8.Another randomized, placebo-controlled, double blind crossover study publis