Sugar-Free Suntheanine Promotes Learning & Calmness Dietary Supplement Vegan Gluten Free Suitable for Vegetarians/Vegans Jarrow Formulas Theanine Gummies deliver 100 mg L-Theanine per gummy. Theanine is a unique amino acid found almost exclusively in green tea that exerts beneficial effects on brain metabolism. Theanine induces relaxation without causing drowsiness, as measured by increased generation of alpha-waves. Theanine may promote learning ability and calmness by affecting dopamine and serotonin neurotransmitters in the brain. Also, theanine may exert protective effects on the brain by helping to maintain healthy metabolism of glutamate. Jarrow Formulas Theanine Gummies incorporate theanine that is made enzymatically from amino acids and is identical to the theanine found in green tea.