WARNING : It is advised that 5-HTP should not be taken by people on SSRIs or other types of antidepressants.
5-Hydroxytryptophan (5-HTP) also known as oxitriptan is a naturally occurring amino acid and chemical precursor as well as a metabolic intermediate in the biosynthesis of the neurotransmitters serotonin and melatonin from tryptophan.
5HTP is a compound produced in the body from the Amino Acid Tryptophan. It is a precursor to the neurotransmitter Serotonin and the hormone Melatonin.  5HTP supplements have become popular because it is thought that providing the body with 5HTP in pill form can boost the body's Serotonin levels to the brain.  5HTP is most commonly used for Mood Enhancement
Research has shown that some people who take 5-HTP may notice an improvement in their mood, reduction in anxiety, decrease in appetite, and felt they were able to sleep better.