L-Theanine is widely used in the food and beverage industry as a dietary supplement due to its ability to promote relaxation without causing drowsiness. It is commonly added to teas, energy drinks, and functional beverages to enhance mental clarity and reduce stress. In the pharmaceutical sector, it is utilized in formulations aimed at improving sleep quality, managing anxiety, and supporting cognitive function. Additionally, L-Theanine is incorporated into nootropic supplements to boost focus and attention, often combined with caffeine for synergistic effects. Its calming properties also make it a popular ingredient in wellness products designed to promote overall mental well-being.