What is L-theanine?

- Sep 24, 2019-

Theanine is an amino acid discovered by Japanese researchers in the 1950s from Yulu green tea, which can emit the aroma of green tea. It is represented by chewing gum and candy... What are the magical effects of L-theanine? Let's listen to our details:

Inhibition of caffeine

From a long time ago, drinking tea will give people a feeling of "warm body and mind" and "heart calm." Previous studies have shown that L-theanine can act on the human brain and exert the effect of inhibiting the caffeine stimulating effect. It is well known that caffeine contained in tea and coffee has the effect of causing nerve excitement and brain refreshing. The L-theanine in tea is thought to relieve the excitatory effects of caffeine. It has been confirmed that the beta wave (the brain wave that occurs in the excited state) when drinking caffeine is inhibited by L-theanine. .

Relaxation effect

It is known that when the human is drinking water, the parasympathetic nerves are stimulated, which in turn produces a relaxing effect. However, in the case of drinking water, the relaxation effect is quick to go, and when drinking the water containing theanine, the relaxation effect can last for nearly one hour.


In order to explore the anti-stress effect of theanine, the Pharmacy Department of Shizuoka Prefectural University issued a research report. Under face-to-face feeding conditions, mice were ingested with drinking water containing theanine, and no acceleration of aging of the mice was observed. Therefore, it can be seen that the ingestion of the theanine can alleviate the pressure, and the effect of suppressing the accelerated aging can be exhibited.

Improve sleep quality

Theanine has a certain effect on difficulty falling asleep and waking up in the middle of the night. Japanese experts have done experiments to prove this.

Improve learning ability and concentration

In the basic study using mice, it was confirmed that the mice's memory and learning ability increased by administering L-theanine to the mice. It is speculated that the administered theanine crosses the blood-brain barrier and enters the brain, thereby changing the concentrations of the neurotransmitters dopamine and serotonin.

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