| L-Tryptophan is an essential amino acid, which means that it must be consumed from food or supplements since the body cannot make it using other amino acids. It is present in virtually all plant and animal proteins. After the body absorbs L-Trytophan, it may ultimately be converted into neurotransmitter serotonin. It is primarily the seratonin which then does much of what L-Trytophan is known for. For example, seratonin is the precursor to the sleep hormone, melatonin. Research has shown that L-Trytophan is effective for inducing sleep, reducing symptoms associated with premenstrual disorder, and supporting a positive mood.
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