American ginseng
 American ginseng (Panax quinquefolius) is a herbaceous perennial plant in the ivy family commonly used as Chinese or herbal medicine. An extract is sold as Cold-fX. It is native to eastern North America though it is also cultivated in places such as China.There is little evidence to support that American ginseng is effective in the common cold. All trials evaluating the efficacy were funded by the manufacturer and there has been poor data reporting.