5-HTP (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. Mars Wellness 5-HTP has a variety of benefits that include the following. Some research suggests that it can help benefit those with headaches, depression, anxiety, sleeplessness and other mood-related health concerns. There has also been successful research using it for weight loss thanks to its appetite controlling ability.