Ciwujia has been used in Chinese medicine for almost 1,700 years. Ciwujia is classified as an adaptogen because of its ability to bolster the immune system. What made this herb particularly interesting to exercise scientists were reports that it was used by Tibetan mountain climbers to improve work performance at high altitudes. Work at high altitude conditions in many ways simulates moderate to intense exercise, since in both cases muscles are operating in a limited oxygen environment. Initial studies indicated that ciwujia had endurance-enhancing properties.
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