Tryptophan affects brain serotonin synthesis when given orally in a purified form and is used to modify serotonin levels for research. Low brain serotonin level is induced by administration of tryptophan-poor protein in a technique called acute tryptophan depletion.
Since tryptophan is an amino acid found in many foods, it is assumed to be safe in normal quantities. It's estimated that a typical diet contains 1 gram per day, but some individuals choose to supplement with doses of up to 5 grams per day
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