Found in blood serum, gastric mucous membranes and especially in brain tissue, Tryptophan is a precursor to Serotonin and used as an inhibitory neurotransmitter. Stimulates the smooth muscles, transmission of impulses between nerve cells, and in the regulation of cyclic body processes. Used in treatment of migraine headaches, insomnia and some types of depression. A balance must be maintained with other amino acids.
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