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Tryptophan is the precursor of 5-hydroxytryptophan, an important neurotransmitter in human body, and one of the essential amino acids in human body. Used as a nutritional supplement, antioxidant, amino acid drugs, biochemical research, etc., used as a sedative in medicine, used as a nutritional supplement for pregnant women and special milk powder for infants; For the treatment of niacin deficiency (pellagra); As a sedative, regulate mental rhythm and improve sleep. It can promote animal feeding, weaken stress response and improve animal sleep.