Tryptophan is an essential amino acid, which can treat insomnia, help to stabilize mood, and work with vitamin B6, nicotinic acid and magnesium in the brain to produce serotonin in the blood, which is an essential neurotransmitter and a neurohormone that makes people sleep normally. Adequate vitamin B6 is necessary for the formation of tryptophan, which is necessary for the formation of serotonin. In addition, tryptophan can promote the secretion of auxin necessary for the production of vitamin B6.