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Brain and Emotional Health200 mg Per CapsuleDietary SupplementVegetarianSuntheanine®Supports Balanced Mental Health and Emotional WellbeingMaintains a Feeling of Calm While Remaining AlertScience-Backed Quality Since 1969L-theanine is an amino acid found almost exclusively in tea plants and in particular green tea. The pioneers at Taiyo International discovered that the relaxing properties of green tea may be tied to this unique nutrient and developed Suntheanine through a patented process designed to amplify its calming potential. Research indicates that Suntheanine stimulates alpha wave activity in the brain which is associated with calm alertness. Swanson Double Potency Suntheanine L-Theanine delivers 200 mg per capsule the upper limit shown to produce results in clinical research.