GNC Melatonin 3mg: For a Restful Night's Sleep GNC Melatonin 3 MG is a supplement that offers a natural way to support restful sleep. Your body naturally produces this hormone in your pineal gland and creates less of this sleep-influencing substance during the day and more at night. Melatonin 3 MG for sleep may be beneficial if you have a sleep schedule that frequently changes. Contains 3mg of melatonin to help you fall asleep These statements have not been evaluated by the Food & Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.