Quantum Health, Extra Strength Sleep Melatonin, 5 Mg, 30 CapsProduct Description Quantum health sleep plus immune formulas were formulated to help fall asleep and to give immune system the support it needs while to enjoy a restful night of sleep. Melatonin naturally produced by the body, melatonin plays a key role in regulating the sleep wake cycle, also known as the circadian rhythm. It can promote drowsiness when taken as a supplement. Product Benefits Used To Promote Relaxation. Immune System Support.