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Encourages Positive MoodSupports Relaxation & Restful SleepNon-GMOA Dietary SupplementVegetarian/VeganTryptophan is an essential amino acid; therefore it is not synthesized by the body and must be obtained from the diet. In the brain tryptophan is converted into serotonin a neurotransmitter involved in feelings of well-being calmness personal security and relaxation. It also plays a role in the regulation of appetite and synchronization of sleep patterns. Every lot of Protocol For Life Balance® L-Tryptophan is tested to be free of peak E and microbial contamination.