L-theanine, a watersoluble amino acid, is found mainly in black and green teas, and to a lesser extent in mushrooms. It constitutes between 1% and 2% of the dry weight of tea.
It has a structural similarity to glutamine (the most abundant amino acid in the bloodstream and produces up to 30-35% of the amino acid nitrogen in your blood) and the two neurotransmitters that are produced from it (glutamate and GABA), and It is known to reach the brain and act in the brain after oral ingestion.
The EFSA – European Food Safety Authority reported negatively on health claims related to this substance and cognitive function, maintenance of normal sleep, relief of psychological stress and anxiety and reduction of menstrual discomfort. Therefore, health claims for this amino acid are prohibited in the US.
However, in the United States, it has been approved by the FDA as a supplement, in doses of up to 250 mg, and has been designated as generally recognized as safe (GRAS).
Health benefits of L-theanine
It enhances sleep quality
This substance can be useful for those who struggle with the quality of sleep, or those who want to achieve everything possible while in periods of sleep deprivation.
Better cognitive function
Improvements in focus, memory, awareness and attention span are frequently reported when this compound is used, mainly due to the ability of the amino acid to increase alpha-1 brain activity. The researchers concluded that the amino acid has the incredible ability to minimize the interference of distracting external stimuli, which at the same time helps to focus attention. The individuals in the study were able to concentrate on important projects without being distracted.
Increase alpha brain waves.
Brain waves are divided into 5 different bandwidths that are believed to create a spectrum of human consciousness. It has been shown that supplementation with this amino acid increases brain waves that are related to the reduction of anxiety and stress. The alpha state of the brain indicates peace of mind, relaxation, relaxed concentration and increased production of serotonin. People who meditate begin to access the unconscious mind in this stage of relaxation. Alpha waves can also be created by doing aerobic exercise.
This supplement can also find an application in complementary therapies for cancer. Not only does it inhibit the growth of certain tumors, but it also increases the activity of doxorubicin, pirarubicin and adriamycin, drugs used in chemotherapy, while reducing their destructive side effects in healthy tissues of the patient.
Side effects of L-theanine
It is a stimulant that most people are familiar with, mainly in coffee, but it can also be found in sodas, tea (especially green and dark), chocolate and in some fruits and seeds.
Because caffeine is soluble in water and passes easily through cell membranes, it is very difficult for your body to purge caffeine from cells. That means that the amount of caffeine in a cup of coffee or tea Stay in your body for a few days. Intake of caffeine can cause symptoms such as nausea, increased heart rate, excessive urination, vomiting, anxiety, depression, restlessness, difficulty sleeping or tremors.
It can decrease serotonin levels.
Serotonin is a chemical messenger that is believed to act as a mood stabilizer. Studies have found links between serotonin and breast milk production, bone metabolism, liver regeneration and cell division. A decrease in serotonin in the brain can result in an increase in tension and stress, which is the opposite of the desired effect for those who suffer from anxiety.
This supplement should be used with caution in people who take antihypertensive medications because it lowers blood pressure. On the other hand, do not take it with medications to lower LDL cholesterol.
L-theanine – Benefits for health and side effects – Nootropic supplement for stress, Source: https://www.yourhealthremedy.com/health-tips/l-theanine-side-effects/
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