Non-GMO.
It is involved in many of the body, brain and glandular biological functions including regulation of normal sleep/wake cycles, regulation of the immune system and maintenance of a healthy gastrointestinal lining. Free Radical Scavenger.Gastrointestinal Support. NOW Melatonin 3 mg - 180 Capsules Melatonin is a potent free radical scavenger naturally produced in the pineal gland and present in high amounts in the gastrointestinal tract.