Each bag contains pure melatonin powder. We Recommend the use of Accurate milligram scale for dosage. High Dosage Melatonin powder for custom dosage 1mg-60mg. The body's melatonin production is easily disrupted by today's lifestyle. If you use a computer, television, smart phone, or other screen device in the evening, it can interfere with melatonin production. Even ordinary light bulbs can be a problem. If you're in an office all day and don't get enough natural light exposure during waking hours, your body is missing important signals needed to produce sufficient melatonin. Each bottle contains s pure melatonin powder.