L-Theanine is widely used in the food and beverage industry as a flavor enhancer, particularly in teas and dietary supplements. It is known for its ability to promote relaxation without causing drowsiness, making it a popular ingredient in stress-relief and mood-enhancing products. In the pharmaceutical sector, it is utilized in formulations aimed at improving cognitive function, reducing anxiety, and enhancing sleep quality. Additionally, L-Theanine is incorporated into functional foods and drinks designed to support mental clarity and focus, often in combination with caffeine to balance its stimulating effects. Its calming properties also make it a common additive in products targeting overall wellness and mental health.