Siberian ginseng ), also known as eleuthero, has been used for centuries in Eastern countries, including China and Russia. Despite its name, it is completely different from American (Panax quinquefolius) and Asian ginseng (Panax ginseng), and has different active chemical components. The active ingredients in Siberian ginseng, called eleutherosides, are thought to stimulate the immune system. Traditionally used , Siberian ginseng is widely used in Russia as an adaptogen. An adaptogen is a substance that is supposed to help the body better cope with stress, either mental or physical.