"5-HTP is an amino acid. Amino acids are substances that build proteins in your body. 5-HTP is related to serotonin, a brain chemical that affects mood, sleep, and pain...
"5-HTP supplements may raise levels of serotonin in the brain. Some studies have found that 5-HTP supplements help relieve depression. Some research showed that 5-HTP worked as well as some antidepressants.
"5-HTP supplements also seem to help with fibromyalgia symptoms. In some studies, it's eased pain, morning stiffness, and sleep problems.
"People take 5-HTP for other conditions, including insomnia, anxiety, and obesity. There's not enough evidence to know whether it works for these conditions.” webmd.com