Kobayashi K., et al.
Journal of the Agricultural Chemical Society of Japan (Japan), 1998
Abstract
L-Theanine is an amino acid found in green tea leaf and in its infusion, and is known to control excitement caused by caffeine. It is also known that the oral administration of L-theanine to rats results in a decrease of serotonin and increase of catecholamines in their brain. L-Theanine has been confirmed to be safe in animal experiments. We found recently that oral intake of L-theanine caused a feeling of relaxation among the human volunteers examined. These observations led us to do experiments on the effects of administration of L-theanine on the brain electric waves. Eight female university students were selected as volunteers. Four of them were ranked to be Grade I (the highest anxiety) and the remaining four, Grade V (the lowest anxiety) in an investigation done by the manifest anxiety scale method. A dose of oral administration of 200 mg of L-theanine dissolved in 100 ml of water resulted in the generation of alpha-electric waves in the occipital and parietal regions of the brains of the subjects. The emission intensity of alpha-brain waves (integrated s a function of investigation times and area) was significantly greater inthe group of Grade I than that of Grade V. These results indicate the possibility for L-theanine to be applied to foods and beverages as a new type of functional food ingredient for its relaxation effect. More: http://agris.fao.org/agris-search/search.do?recordID=JP1998003883
| Category: | Brain / Mental Clarity |
|---|
The best supplements with L-Theanine in Brain / Mental Clarity category:
- Alert – THC-Free CBD Energy Capsules - 30 capsules/300 mg total CBD (Plants Not Pills) - These Focus formula capsules are used by clients to increase alertness and attention. It contains among others: L-Theanine.
- Mood Support with St. John's Wort, 90 Veg Capsules (Now Foods) - NOW Mood Support is a nutritional supplement that has both nutrients and herbal extracts that aid in the support of a healthy nervous system and a positive, balanced mood state. It contains among others: L-Theanine.
- NooCube - NooCube is a synergistic blend of nootropics which helps support and enhance your focus, mental speed and memory. It contains among others: L-Theanine.
- Brain Pill - „An amazing new product that supports your brain health and has the potential to change your life returning laser-sharp mental clarity” - Dr Dave David, a surgeon and physician for more than 37 years. It contains among others: L-Theanine.
Articles similar to "Effects of L-theanine on the release of alpha-brain waves in human volunteers."
- The significance of L-Theanine for Brain / Mental Clarity: A combination of green tea extract and l-theanine improves memory and attention in subjects with mild cognitive impairment: a double-blind placebo-controlled study. (A combination of green tea extract and l-theanine (LGNC-07) has been reported to have beneficial effects on cognition in animal studies...)
- The role of L-Theanine in Brain / Mental Clarity: Anti-stress, behavioural and magnetoencephalography effects of an l-theanine-based nutrient drink: a randomised, double-blind, placebo-controlled, crossover trial. (L-theanine (γ-glutamylethylamide) is an amino acid found primarily in the green tea plant...)
- The impact of L-Theanine on Brain / Mental Clarity: Neuroprotective effects of theanine and its preventive effects on cognitive dysfunction. (Theanine (γ-glutamylethylamide) characteristically present in tea leaves (Camellia sinensis)...)
- The role of L-Theanine in Brain / Mental Clarity: L-Theanine, a Natural Constituent in Tea, and Its Effect on Mental State. (Tea is the most widely consumed beverage in the world after water...)
- The impact of L-Theanine on Brain / Mental Clarity: L-Theanine reduces psychological and physiological stress responses. (L-Theanine is an amino acid contained in green tea leaves which is known to block the binding of L-glutamic acid to glutamate receptors in the brain...)
- The significance of L-Theanine for Brain / Mental Clarity: The combined effects of L-theanine and caffeine on cognitive performance and mood. (The aim of this study was to compare 50 mg caffeine, with and without 100 mg L-theanine, on cognition and mood in healthy volunteers...)
- The role of L-Theanine in Brain / Mental Clarity: L-theanine, a natural constituent in tea, and its effect on mental state. (Tea is the most widely consumed beverage in the world after water...)
- The impact of L-Theanine on Brain / Mental Clarity: L-Theanine reduces psychological and physiological stress responses. (L-Theanine is an amino acid contained in green tea leaves which is known to block the binding of L-glutamic acid to glutamate receptors in the brain...)
- The significance of L-Theanine for Brain / Mental Clarity: In search of a safe natural sleep aid. (Sleep deprivation is associated with an elevated risk of various diseases and leads to a poor quality of life and negative socioeconomic consequences...)
- The role of L-Theanine in Brain / Mental Clarity: Acute effects of tea constituents L-theanine, caffeine, and epigallocatechin gallate on cognitive function and mood: a systematic review and meta-analysis. (A systematic review and meta-analysis was conducted on 11 randomized placebo-controlled human studies of acute effects of tea constituents L-theanine and epigallocatechin gallate, administered alone or in combination with caffeine, on cognitive function and mood...)
- The impact of L-Theanine on Brain / Mental Clarity: Effect of Green Tea Phytochemicals on Mood and Cognition. ( Green tea is traditionally known to induce mental clarity, cognitive function, physical activation and relaxation... Caffeine was found to mainly improve performance on demanding long-duration cognitive tasks and self-reported alertness, arousal, and vigor. Significant effects already occurred at low doses of 40 mg. L-theanine alone improved self-reported relaxation, tension, and calmness starting at 200 mg. L-theanine and caffeine combined were found to particularly improve performance in attention-switching tasks and alertness, but to a lesser extent than caffeine alone. No conclusive evidence relating to effects induced by EGCG could be given since the amount of intervention studies was limited. These studies provided reliable evidence showing that L-theanine and caffeine have clear beneficial effects on sustained attention, memory, and suppression of distraction. Moreover, L-theanine was found to lead to relaxation by reducing caffeine induced arousal. )
Previous article
Indian traditional memory enhancing herbs and their medicinal benefits.
Next article
L-Theanine, a Natural Constituent in Tea, and Its Effect on Mental State.