Drug free. Natural acting. Two stage release. Melatonin 10 mg. 7 hrs of sleep. Sleep the night through. Non-habit forming. Get to sleep faster, stay asleep longer. 1 Instant release. 2 Gradual release. NiteThru releases melatonin in two stages: fast-acting powder to help you fall asleep faster, and long-lasting beads to help you stay asleep longer.