Green tea is one of the most powerful natural antioxidant sources and is the second most popular beverage worldwide. It contains a plurality of polyphenols, in particular, catechins.
People, however, often overlook the power of green tea as peace and quality sleep stimulator. One of the green tea’s little secrets is the L-theanine amino acid, which has been used as a means of calming, combating stress and improving sleep for years.
Theanine is an amino acid which is not typical for the popular diet because its natural sources are green and black tea and they are not the typical food from modern diets.
The richest theanine sources are green and black tea. The main function of theanine is associated with its effect on the brain and nervous system.
Theanine is considered to be an antagonist of the excitatory receptor of n-methyl-d-aspartate and stimulates the levels of other neurotransmitters, such as GABA. Several studies have shown the positive effects of theanine on mood, mental attitude and concentration.
When in combination with caffeine, however, theanine demonstrates far more powerful results, expressed in increased accuracy and attention in cognitive tests, reduced fatigue, alertness stronger and shorter reaction time.
Theanine also drastically reduces a headache, caused by high doses of caffeine. Now let's see in this research review about L-Theanine why this supplement is called the amino acid with the green tea spirit.
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