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There are two types of Ginseng, Asian Ginseng and Korean Ginseng, both have been used for medicinal purposes.
Some studies have found that ginseng may boost the immune system. There is some evidence that one particular type of American ginseng extract might decrease the number and severity of colds in adults.
Several studies in people have also shown that ginseng may lower blood sugar levels
There is some early evidence that ginseng might temporarily -- and modestly -- improve concentration and learning. In some studies of mental performance, ginseng has been combined with ginkgo. While these studies are intriguing, many experts feel that we need more evidence.
Ginseng has also been studied as a way to improve mood and boost endurance as well as treat cancer, heart diseases, fatigue, hepatitis C,high blood pressure, menopausal symptoms, and other conditions. While some of these uses are promising, the evidence isn't conclusive.