Theanine is an amino acid, chemically known as L-y-glutamylethylamide. It is present in some plants and some species of fungi. It was first isolated in a laboratory from Gyokuro leaves in 1950. It is found in tea leaves. Infact, it is used as an ingredient in diet supplements.


How Was It Discovered

It was observed for the first time in the tea leaves of species Camellia sinensis in 1949. It was seen as a basic tea ingredient.

Later, in 1950, it was discovered in the leaves of gyokuro. This was the first time when the amino acid was successfully isolated in a laboratory in Kyoto, a city in Japan.

Uses And Benefits

It is a safe amino acid present in caffeine, which is a prime component of teas and coffees. It is known to cure fluctuation in blood pressure. In addition to that, it targets anxiety and depression, causing them to lessen their effects. It promotes weight loss and facilitates easy fat reduction. Theanine builds a strong immune system and helps in fighting several diseases.

Theanine acts on dopamine, leading to its release. This neurotransmitter causes your mood upliftment and rejuvenation. Furthermore, it benefits ADHD patients by providing them a good quality sound sleep. Theanine is said to improve memory power, logical thinking and analytical skills.

Safety Factors

Many researches showed that taking Theanine is safe for usage but only upto a certain limit. The range of the dose quantity could go from 250mg to 1,200mg. One thing to keep in mind is that pregnant and lactating mothers should avoid theanine at all costs. 


Although theanine is safe for human usage, it comes with some warnings as well. Here are a few threats to mankind.

  • Excess of theanine supplements could lead to stomach ache and bloating. In extreme cases, it could lead to peptic ulcers.
  • It is not safe for children below the age of 16.
  • It is not safe for the women who are breastfeeding or are pregnant.
  • One should consult a doctor before taking theanine as it could react with other medicines as well.

The Bottom Line

Theanine is an amino acid found in green tea. It is safe for human consumption. Theanine supplements have numerous uses and are safe to use. One should keep in mind that when used under control, it acts as a mood refresher and provides many surprising benefits.


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