Double Strength Stress Management Promotes Relaxation Healthy Vascular Function With Inositol Non-GMO A Dietary Supplement Vegan - Vegetarian Kosher Amino Acids Family Owned since 1968 GMP Quality Assured L-Theanine is a unique amino acid found naturally in the tea plant (Camellia sinesis). L-Theanine promotes relaxation while maintaining alertness and promotes healthy cognitive function. L-Theanine may also support healthy vascular function through this relaxing effect.