Serotonin

Serotonin (C₁₀H₁₂N₂O) , also called 5-hydroxytryptamine or 5-HT for short, is a neurotransmitter that is derived from tryptophan and is involved in sleep, depression, memory and some neurological processes. It is often associated with depression as it is thought that a lack of it can lead to a low mood and is therefore often included in some anti-depressant drugs. However, the majority of serotonin levels in the body are found in the intestinal tract where they maintain intestinal movements .