original xian zhi su usually refers to the plant Ephedra sinica

original xian zhi su usually refers to the plant Ephedra sinica. Known in Chinese as ma huang, has been used in traditional for 5,000 years for the treatment of asthma and hay fever, as well as for the common cold. Several additional species belonging to the genus these have traditionally been used for a variety of medicinal purposes, and are a possible candidate for the Soma plant of Indo-Iranian religion, Native Americans and  drank a tea brewed from an these, called Mormon Tea or Indian Tea.

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It is a natural plant extract that has been shown to boost metabolism and help with weight loss. Before it was found to help with weight loss it was used by the Indians to help fight colds and breathing problems. It was usually put into hot water and gradually sipped on to help with asthma or colds.