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5-HTP or 5-Hydroxytryptophan is a metabolite of the amino acid tryptophan that increases the production of a chemical called serotonin in the brain. The neurotransmitter serotonin may play a role in sleep, appetite, sexual behaviour, pain and temperature. By increasing the synthesis of serotonin, 5-HTP may help in relieving certain conditions associated with unexplained body pain and depressed mood. It may also promote better sleep, improve appetite and decrease the desire for sugars.