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L-Tryptophan is one of the 8 essential amino acids(a protein building block that isnt produced internally and must be consumed) and the only source of raw dietary material for serotonin/melatonin synthesis in the brain. It is also needed for the internal production of niacin(vitamin B-3), 5-htp, and trace amounts of tryptamine. Serotonin is a very important neurotransmitter that controls the regulation of sleep, mood, appetite and digestion, and is often used to augment anti-depressive/anxiety regimens.