Supports Sleep Dietary Supplement Nutricost Quality Guaranteed Third Party Tested Gmp Compliant Facility Non-gmo Product Gluten-Free Melatonin is a naturally occurring hormone, produced by our pineal gland, that helps our bodies sleep. This “sleep hormone” helps to set our internal clock or circadian rhythm, and has also been found to play other important roles in our bodies. Melatonin has shown to be safe and effective and can be a great way to help establish good sleep habits and routines.