NOW Foods Melatonin provides 3 mg of melatonin per serving in 180 vegan capsules. This moderate-strength melatonin supplement supports healthy sleep patterns by helping regulate circadian rhythms. The vegan capsules are suitable for those following plant-based diets or with dietary restrictions. Melatonin is a hormone naturally produced by the pineal gland that declines with age. This supplement should be used as part of a comprehensive approach to sleep hygiene.