what is a 5HTP
5-HTP (5-Hydroxytryptophan). 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.It is available as a supplement and is generally considered safe, although some contaminated supplements have caused dangerous side effects.ome 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.