American and Canadian Ginseng are also known as Panax quinquefolius.  Canadian ginseng is the most balanced of all the ginseng varieties, and is shown to have twice the concentration of ginsenosides of Korean Ginseng.
Canadian ginseng is considered to be more relaxing, and known to increase the “yin” energy, and has a cooling effect on the body
Korean Ginseng is also known as Panax Ginseng. This is an Asian Root, which has a warming effect on the body. Korean Ginseng is not recommended for menopausal women or people with high blood pressure or hypertension.
Korean is known to increase the “yang” energy. Korean ginseng is considered most suitable for males and older people.
Siberian Ginseng is not a true ginseng, but it is a related plant.