Double Strength Supports Cardiovascular Function Promotes Relaxation GMP Quality Assured: NPA A-rated GMP certification means that every aspect of the NOW manufacturing process has been examined, including our laboratory/testing methods (for stability, potency, and product formulation). Theanine is a unique amino acid found naturally in the tea plant (Camellia sinensis). Theanine promotes relaxation while maintaining alertness and promotes healthy cognitive function. Theanine may also support healthy vascular function through this relaxing effect. This product has twice the L-Theanine (200 mg per capsules) as in our regular strength product (100 mg per capsule).Theanine is a unique amino acid found naturally in the tea plant (Camellia sinensis). Theanine promotes relaxation while maintaining alertness and promotes healthy cognitive function. Theanine may also support healthy vascular function through this relaxing effect. This product has twice the L-Theanine (200 mg per capsules) as in our regular strength product (100 mg per capsule).L-Theanine 200 mg, Inositol 100 mg Other Ingredients: Hypromellose (cellulose capsule), Stearic Acid (vegetable source) and Silicon Dioxide.