Xi'an day natural inc offers wide range of products which includes 5-hydroxytryptophan (5-htp). It is also known as oxitriptan (inn), it 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. It regulates serotonin levels in the body, which is a vital brain chemical that controls mood, appetite, and stress levels. Because of this, it has numerous benefits in the body, which include: reduction in appetite/weight loss,reduced stress/anxiety,better sleep cycle,improved brain function,greater energy levels and improved mood. Contact us for more information.