Now, 5-HTP Neurotransmitter Supplement works by enhancing serotonin production, which is a "feel good" neurotransmitter. 5-HTP, an intermediary metabolite between the amino acids L-tryptophan and serotonin, is derived from the seed of an African plant called Griffonia simplicifolia. 5-HTP promotes the creation of serotonin in the brain and central nervous system, which influences sleep, mood, hunger, and body temperature. Low levels of the neurotransmitter serotonin are thought to contribute to a variety of mental and physical health problems, including depression, sleeplessness, and obesity, and increasing levels appears to be one strategy to address these concerns. Because serotonin helps regulate mood and behavior, 5-HTP may improve sleep, mood, anxiety, hunger, and pain sensitivity. 5-HTP is commonly used to promote peaceful sleep because it increases the production of serotonin, which is then converted to melatonin.