Experience the ultimate joy of life and say goodbye to stress in an all-natural way with L-theanine! This unique amino acid has been the subject of numerous studies and has proven its benefits for promoting repose and complete relaxation without causing drowsiness. It works by improving endocrine function and stimulating specific brain waves, without disturbing others. Swanson Ultra, including patented compound SunTheanine, offers a safe and effective alternative that will help you maintain a good daily pace without losing the smile on your face!