Theanine Extract Introduction Theanine, an amino acid found in tea leaves, has calming effects and is known to promote relaxation without causing drowsiness. It may help reduce stress and anxiety. Theanine is associated with improved sleep quality. It may enhance the quality of sleep by promoting relaxation and reducing the time it takes to fall asleep. Theanine, often found in green tea, has been studied for its cognitive-enhancing effects. It may help improve focus, attention. Theanine Extract Key Point Some studies suggest that theanine may have a blood pressure-regulating effect, promoting cardiovascular health by helping maintain healthy blood pressure levels.and cognitive performance. Theanine is believed to have mood-enhancing properties, potentially contributing to a more positive and calm state of mind.