Feb 18, 2026Eleuthero (Siberian Ginseng): Adaptogen Evidence, Fatigue, and Comparison with RhodiolaEleuthero (Eleutherococcus senticosus) is one of the most studied adaptogens, with Soviet-era and modern research on fatigue, immune function, and physical performance. Evidence quality is moderate; its benefit profile overlaps with rhodiola but with a distinct safety profile.