There are different varieties of ginseng and ways to consume it. In the market you can buy capsule, tablets, teas, syrups, chewing gums and ginseng powder extracts. As for botany, there are more than 13 species of plants that are given the name "ginseng" due to their energizing and anti-fatigue properties, but the best are:
Korean Ginseng (Panax ginseng): This is the "official" ginseng, whose content of ginsenosides and panaxanos make it a "superfood" with enormous potential to improve health. Korean ginseng can be white or red, the latter being the one with the greatest therapeutic effect. It is used as an energizer, adaptogen and stimulant of brain function.
American Ginseng (Panax quinquefolium): As in the case of Korean ginseng, most of the properties of this variety are due to the ginsenosides it provides. It helps prevent respiratory conditions, such as the common cold and the flu. It also exerts a hypoglycemic effect (reduction of blood glucose) in diabetics and non-diabetics.
Siberian Ginseng (Eleutherococcus senticosus): This plant belongs to the same family as Korean ginseng and American ginseng, but its active ingredients are different. Instead of ginsenosides and panaxanos they provide eleutherosides and eleutheranos. It increases energy levels, supports immune functions and lowers blood glucose level.