Siberian ginseng is the common name for eleuthero, the root of Eleutherococcus senticosus, a woody shrub native to north-eastern Asia. Despite the name it is not a true ginseng but a distant relative, marketed as an adaptogen claimed to increase resistance to stress, fatigue, and illness. Its active compounds, the eleutherosides, have shown modest effects on stamina and mental performance in some trials, though the evidence is mixed and hampered by variable product quality. Soviet researchers studied it extensively for workers and athletes, which built its reputation. Side effects are generally mild but it can raise blood pressure and interact with medications. Like many adaptogens, its fame outruns its proof, and quality control of commercial products is inconsistent.