Rave Revovery Supplement and Serotonin Preaload Hangover Cure. 5-HTP (a.k.a. 5-hydroxytryptophan) is an amino acid that the body naturally produces. Most importantly the body uses 5-HTP to produce serotonin. Unfortunately, low serotonin levels can mean weight gain, mood issues and poor sleep, among other health concerns. Many people have turned to 5-HTP supplements to help balance their serotonin levels.