Predominantly used as a relaxation supplement, Suntheanine is an artificial derivative of the amino acid L-Theanine, which is found naturally in green tea. It is known to increase the effectiveness of GABA (an important neurotransmitter that restricts the activity ofover active neurons), which also minimizes the brain’s reactions to stimuli.



Discovered in 1949, Suntheanine was approved in 1964 by Japan and found its place in the consumption industry, being utilized as an ingredient in various chocolates, teas, and soft drinks. However, its primary use is as a relaxation tool, and after entering the central nervous system it works to influence the brain’s alpha waves (combinations of synchronized electrical activity within the brain). Enhanced levels of alpha brain waves directly correlate with relaxation and states of calm. Suntheanine has also been shown to reduce the number of beta brain waves, which act in direct contrast to their alpha cousins. Beta waves are utilized in cases of overly-excited states. In addition, it boosts the activity of neurotransmitters such as dopamine, serotonin, and GABA, which help to moderate the activity of stimulated neurons within the brain, normalizing their communications. This lessens feelings of stress and depletes anxiety. Suntheanine is a purer form of Theanine, and as a result is classified as a pharmaceutical grade substance. This makes it a more effective antioxidant, which ensures that it is capable of detracting harmful toxins and elements from the brain and throughout the body, which can strengthen the immune system and promote better overall health.

Side Effects & Dosages

Suntheanine has been classified by the FDA as a safe substance, and its use generally comes with low risks of negative effects. However, it has not been approved as a drug with the potential to prevent or treat any conditions, and mild side effects are a possibility, regardless of their likelihood. These can include headaches, diarrhea, insomnia, and heartburn, although it is important to note that side effects come at abused dosages. Also, it should not be taken with any other drugs that affect the body’s internal processes, which includes the manipulation of blood pressure and the treatment of depression. If that is the case, then a recommendation and evaluation from a qualified medical professional will ensure that Suntheanine is taken properly. Typical doses range in-between 100 and 250 mg daily, although suggested amounts begin from 50 to 100 daily, especially for those who are beginning with supplementations.

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