L-TheanineTemporarily promotes relaxation Contains Suntheanine, a clinically studied form of L theanine Convenient capsule to take once a day L theanine is a unique amino acid extracted from tea. L theanine has also been found to be a biologically active compound that promotes relaxation. It works by reducing cortisol levels during times of stress and regulating the activity of neurotransmitters in the brain. In a preliminary non clinical study, an L theanine