Doctor’s Best L-Theanine with Suntheanine 150mg 90 Capsules

L-theanine with Suntheanine is an amino acid derived from green tea (produced in Japan) that is responsible for the relaxation-inducing effect of tea consumption. 

L-theanine is synthesized in the roots of tea plants and transported to the leaves, comprising about 2% of the total dry weight of green tea leaves. It is the ingredient that is responsible for both the taste and the relaxing effects of green tea.

Suntheanine® has been shown to promote an alert state of relaxation. This is characterized by an increase in alpha brain waves (signifying a relaxed, alert state) and a decrease in beta brain waves (signifying an awake, excited state of mind).

Suntheanine® may also improve sleep quality, enhance mental acuity and soothe away tension and nervousness.

Research shows that supplemental L-theanine crosses the blood-brain barrier within 30 minutes of intake and this is able to exert its effects directly on the brain.

Suntheanine® L-theanine is best known for its unique ability to promote relaxation without causing drowsiness.

Promotes a relaxed state without drowsiness

Takes effect within 30-40 minutes

Helps improve GABA (gamma amino butyric acid) levels. GABA is an inhibitory neurotransmitter important for nervous system function

Eases stress and everyday nervous tension

Promotes a positive mood and alertness

May enhance cognitive performance and promote attention to detail

Helps ease stress and everyday nervous tension

Studies on test rats have shown even repeated, extremely high doses of theanine cause little to no harmful psychological or physical effects. Theanine showed neuroprotective effects in one rat study.

In one double-blind study illustrating L-theanine’s anti-stress effects, it was found that a single dose influences both psychological and physiological states under acute stress. This study gave 12 participants a mental maths task as an acute stressor. L-theanine intake resulted in lower levels of perceived stress during the maths task.

It seems L-theanine is an agent that is best used as a countermeasure to potential situations of nervousness and tension by supporting mental tranquility. Suntheanine® may normalize the body’s stress response and condition the body to handle stressful situations better.

Promotes a relaxed state without drowsiness

Eases stress and everyday nervous tension

Promotes a positive mood and alertness