A team at the Mayo Clinic Cancer Center in the US found that high doses of the herb American ginseng over two months reduced cancer-related tiredness in patients more effectively than a placebo.
In the study, the researchers looked at 340 patients who had either completed cancer treatment or were being treated for the disease. They gave them a placebo or capsules having 2,000 mg of pure, ground American ginseng root.
At four weeks, the ginseng provided a slight improvement in fatigue symptoms of the patients. However, at eight weeks, it offered them significant improvement in general exhaustion -- such as feelings of worn out, fatigued, sluggish, run-down or tired
