Natural Factors Stress-Relax Tranquil Sleep - A safe, fast acting formula containing: the amino acid 5-HTP; the hormone melatonin; and green tea’s stress-reliever, L-Theanine. Together these natural compounds exert a powerful synergistic effect to promote restful sleep. 5-HTP can help you get to sleep faster and reduce nighttime waking. Melatonin helps initiate sleep, and is used for jet lag and insomnia. L-Theanine (patented Suntheanine), from green tea, is a stress reducer that can enhance the tranquility of sleep. In tropical fruit flavour chewable tablets.