Eleuthero Root

Eleuthero’s modern reputation was built in the Soviet Union. From the 1950s, researchers investigating adaptogens studied the root intensively, and it was entered into the Russian pharmacopoeia ^{21Reference 21Bone et al. · 2013Principles and Practice of Phytotherapy (2nd ed.) — reference text (pp}.

It was taken up widely as a stress-and-stamina tonic: by Soviet athletes preparing for the Olympic Games in the late 1970s and early 1980s, and reportedly in the Soviet space programme in 1977 ^{21Reference 21Bone et al. · 2013Principles and Practice of Phytotherapy (2nd ed.) — reference text (pp}.

In Chinese medicine the root is known as ci wu jia. It is classified as pungent and bitter in taste and warm in nature, entering the Liver and Kidney channels ^{20,21Reference 20Hempen et al. · 2009A Materia Medica for Chinese Medicine: Plants, Minerals, and Animal Products — reference text (ppReference 21Bone et al. · 2013Principles and Practice of Phytotherapy (2nd ed.) — reference text (pp}.

It is used to dispel wind-dampness, to drain dampness and promote urination, to strengthen the bones and sinews, and to tonify yang. The dried root is simmered for about 20 minutes at 3–15 g, most often inside a formula rather than alone ^{20Reference 20Hempen et al. · 2009A Materia Medica for Chinese Medicine: Plants, Minerals, and Animal Products — reference text (pp}.

Classical practice regards it as acceptable during pregnancy, but contraindicated where there are signs of yin-deficient heat ^{20Reference 20Hempen et al. · 2009A Materia Medica for Chinese Medicine: Plants, Minerals, and Animal Products — reference text (pp}.

This is eleuthero’s best human evidence. In a double-blind, placebo-controlled trial, 36 healthy volunteers took an ethanolic root extract (10 mL three times daily for 4 weeks). Flow cytometry showed a pronounced rise in immunocompetent cells, chiefly T-helper/inducer lymphocytes but also cytotoxic T-cells and natural killer cells, with no side effects over a 6-month observation window ^{1Reference 1Bohn B et al. · 1987RCTFlow-cytometric studies with Eleutherococcus senticosus extract as an immunomodulatory agent — randomised placebo-controlled trialView study →}.

Animal work points the same way. Root-powder supplementation raised NK-cell killing rate, lysozyme and secretory IgA in healthy mice ^{2Reference 2Zhang Y et al. · 2021AnimalEffects of Acanthopanax senticosus supplementation on innate immunity and changes of related immune factors in healthy mice — animal studyView study →}, and an injected root polysaccharide restored lymphocyte proliferation and antibody titres in immunosuppressed chickens ^{3Reference 3Yang S et al. · 2021Immunomodulatory effect of Acanthopanax senticosus polysaccharide on immunosuppressed chickens — animal studyView study →}.

In endurance athletes taking an ethanolic extract for six weeks, lymphocyte subset counts did not change ^{9Reference 9Gaffney BT et al. · 2001Clinical trialThe effects of Eleutherococcus senticosus and Panax ginseng on steroidal hormone indices of stress and lymphocyte subset numbers in endurance athletes — clinical trialView study →}.

A quadruple-blind RCT in mild COVID-19 found fewer cases progressing to severe disease and a shorter illness, but it tested a fixed combination of eleuthero with Andrographis paniculata (Kan Jang), so the effect cannot be credited to eleuthero alone. CRP and D-dimer did not change ^{28Reference 28Ratiani L et al. · 2023RCTEfficacy of Kan Jang in patients with mild COVID-19 — randomised, quadruple-blind, placebo-controlled trial of a fixed Andrographis–Eleutherococcus combinationView study →}.

Gap: the human single-herb trial measured cell counts, not clinical outcomes — there is no RCT showing eleuthero reduces infection rate, duration, or severity in people.

The human results are modest and depend on the population. A randomised trial in 96 people with chronic fatigue found no overall benefit versus placebo; a subgroup with less severe fatigue did improve, in an analysis not adjusted for multiple comparisons ^{5Reference 5Hartz AJ et al. · 2004RCTRandomized controlled trial of Siberian ginseng for chronic fatigue — RCTView study →}.

In 20 elderly hypertensive patients, 300 mg/day of dry extract improved social-functioning scores at 4 weeks, but the difference had faded by 8 weeks ^{6Reference 6Cicero AF et al. · 2004RCTEffects of Siberian ginseng (Eleutherococcus senticosus) on elderly quality of life — randomised clinical trialView study →}.

Adding eleuthero (120 mg/day) to stress-management training produced no extra benefit in 144 people with stress-related fatigue ^{7Reference 7Schaffler K et al. · 2013RCTNo benefit adding Eleutherococcus senticosus to stress management training in stress-related fatigue — randomised controlled studyView study →}.

A review of adaptogen trials rated the human evidence for eleuthero in mild fatigue and weakness as “good”, and linked the effect to HPA-axis regulation and heat-shock protein (Hsp70) signalling ^{4Reference 4Panossian A · 2009ReviewEvidence-based efficacy of adaptogens in fatigue, and molecular mechanisms related to their stress-protective activity — reviewView study →}. The European Medicines Agency accepts the root as a traditional herbal medicine for symptoms of asthenia such as fatigue and weakness ^{30,31Reference 30Patyra A et al. · 2025ReviewEleutherococcus root: a comprehensive review of its phytochemistry and pharmacological potential in the context of its adaptogenic effect — reviewView study →Reference 31European Medicines Agency · 2014ReviewCommunity herbal monograph on Eleutherococcus senticosus (Rupr. et Maxim.) Maxim., radix — EMA/HMPC/680618/2013 (traditional use for asthenia). https://www.ema.europa.eu/en/medicines/herbal/eleutherococci-radixView study →}.

A single dose of a combination product (with rhodiola and schisandra) improved attention under stress, but that cannot be credited to eleuthero alone ^{8Reference 8Aslanyan G et al. · 2010RCTDouble-blind, placebo-controlled, randomised study of single-dose effects of ADAPT-232 on cognitive functions — RCT of a fixed combinationView study →}.

Gap: effects are small, often transient, and clearest only in already-fatigued or elderly populations; no trial demonstrates a durable adaptogenic benefit in healthy adults, and the EMA classification is traditional-use, not well-established-efficacy.

Anti-inflammatory activity is documented in animals rather than people. In a rat cerebral-ischaemia model, a water extract inhibited cyclooxygenase-2 (COX-2) and microglial (OX-42) expression in the injured brain region ^{10Reference 10Bu Y et al. · 2005AnimalSiberian ginseng reduces infarct volume in transient focal cerebral ischaemia in Sprague-Dawley rats — animal modelView study →}. The coumarin isofraxidin is the constituent most often credited with suppressing inflammatory mediators.

No human study has measured CRP, cytokines or symptom scores for eleuthero alone.

In rats with a temporary blockage of the middle cerebral artery, an injected water extract (100 mg/kg) reduced infarct volume by 37% and suppressed COX-2 and microglial activation around the damaged area ^{10Reference 10Bu Y et al. · 2005AnimalSiberian ginseng reduces infarct volume in transient focal cerebral ischaemia in Sprague-Dawley rats — animal modelView study →}.

The lignan eleutheroside E, injected at 50 mg/kg, reduced anaesthesia-induced cognitive impairment in aged rats by restoring hippocampal acetylcholine and α7-nicotinic/NMDA-receptor signalling ^{26Reference 26Lu et al. · 2019Eleutheroside E attenuates isoflurane-induced cognitive dysfunction by regulating the α7-nAChR-NMDAR pathway — animal studyView study →}. An extract improved memory in Alzheimer-model mice, with increased MAPK-pathway phosphorylation ^{27Reference 27Zhang Z et al. · 2024Acanthopanax senticosus improves cognitive impairment in Alzheimer’s disease by promoting the phosphorylation of the MAPK signaling pathway — animal studyView study →}.

A pharmacological review collects further activity across depression, Parkinson’s and ischaemia models ^{25Reference 25Li XT et al. · 2022ReviewPharmacological effects of Eleutherococcus senticosus on the neurological disorders — reviewView study →}.

Every study is in animals, several lean on network-pharmacology target prediction, and there is no human data or oral-dosing comparison.

In isolated rat aorta, a root extract produced dose-dependent relaxation that was partly dependent on the endothelium and nitric oxide, and partly independent of it ^{24Reference 24Shiokawa Y et al. · 2019Acanthopanax senticosus induces vasorelaxation via endothelial nitric oxide-dependent and -independent pathways — animal studyView study →}.

Given by mouth to rats at 900 mg/kg a day, it lowered systolic blood pressure 3 hours after dosing, but the drop was gone by the second day. The authors concluded that no lasting blood-pressure effect should be expected in healthy animals ^{24Reference 24Shiokawa Y et al. · 2019Acanthopanax senticosus induces vasorelaxation via endothelial nitric oxide-dependent and -independent pathways — animal studyView study →}.

In the one human dataset, elderly hypertensive patients given 300 mg/day of dry extract, blood pressure did not change in either direction ^{6Reference 6Cicero AF et al. · 2004RCTEffects of Siberian ginseng (Eleutherococcus senticosus) on elderly quality of life — randomised clinical trialView study →}.

Gap: the vasorelaxant effect is ex vivo and in a rat model at a dose far above human use; the only human cardiovascular endpoint was null, and no trial has tested blood pressure or endothelial function as a primary outcome.

A liquid root extract inhibited replication of human rhinovirus, respiratory syncytial virus and influenza A in infected cell cultures, with strong plaque reduction. It showed no activity against the DNA viruses HSV-1 or adenovirus, and pre-treating cells did not block viral adsorption ^{11Reference 11Glatthaar-Saalmüller B et al. · 2001In vitroAntiviral activity of an extract derived from roots of Eleutherococcus senticosus — in vitroView study →}.

The nearest human data is the mild-COVID RCT, but it tested eleuthero combined with Andrographis ^{28Reference 28Ratiani L et al. · 2023RCTEfficacy of Kan Jang in patients with mild COVID-19 — randomised, quadruple-blind, placebo-controlled trial of a fixed Andrographis–Eleutherococcus combinationView study →}. There is no single-herb animal or human antiviral data, and the tested extract’s active fraction and oral bioavailability are unknown.

Eleuthero has a long history as a training and recovery tonic, from Soviet-era sports programmes onward ^{21Reference 21Bone et al. · 2013Principles and Practice of Phytotherapy (2nd ed.) — reference text (pp}.

In 20 highly trained distance runners, six weeks of extract produced no change in VO2, heart rate, lactate, perceived exertion or time to exhaustion ^{12Reference 12Dowling EA et al. · 1996RCTEffect of Eleutherococcus senticosus on submaximal and maximal exercise performance — randomised placebo-controlled trialView study →}. In nine endurance cyclists, 1,200 mg/day for a week did not alter substrate use or 10-km time-trial performance ^{13Reference 13Eschbach LF et al. · 2000RCTThe effect of Siberian ginseng (Eleutherococcus senticosus) on substrate utilization and performance — randomised crossover trialView study →}.

A structured review found that the three studies suggesting benefit each had serious methodological flaws, while five rigorous studies showed no effect at 1,000–1,200 mg/day for 1–6 weeks ^{14Reference 14Goulet ED · 2005ReviewAssessment of the effects of Eleutherococcus senticosus on endurance performance — reviewView study →}.

A later crossover trial in nine recreationally trained men found that 800 mg/day for 8 weeks raised VO2 peak by 12% and endurance time by 23% ^{15Reference 15Kuo J et al. · 2010RCTThe effect of eight weeks of supplementation with Eleutherococcus senticosus on endurance capacity and metabolism — randomised crossover trialView study →}.

In club-level endurance athletes, six weeks of extract lowered the testosterone-to-cortisol ratio by 28.7%, a shift toward higher stress-hormone levels ^{9Reference 9Gaffney BT et al. · 2001Clinical trialThe effects of Eleutherococcus senticosus and Panax ginseng on steroidal hormone indices of stress and lymphocyte subset numbers in endurance athletes — clinical trialView study →}.

Gap: no trial has measured recovery or performance across a full training season.

Toxicity. Rodent LD50 values are very high: around 31 g/kg for the root in mice and 10 mL/kg for the 1:1 fluid extract in rats. Rats fed eleutherococcus for their entire lifespan, at well above usual doses, showed no toxic effects ^{21Reference 21Bone et al. · 2013Principles and Practice of Phytotherapy (2nd ed.) — reference text (pp}.

Stimulant effects. At higher doses it can cause insomnia, irritability, palpitations or restlessness. People with anxiety or insomnia, or those already taking stimulants, may prefer a lower dose.

Digoxin tests. Eleuthero contains digoxin-like substances that react with some digoxin immunoassays. Depending on the assay, they give a falsely high or a falsely low reading, while other assays are unaffected ^{17,18Reference 17Dasgupta A et al. · 2003Effect of Asian and Siberian ginseng on serum digoxin measurement by five digoxin immunoassays — assay-interference studyView study →Reference 18Dasgupta A · 2005Effect of Brazilian, Indian, Siberian, Asian, and North American ginseng on serum digoxin measurement by immunoassays — assay-interference studyView study →}. In one case report, a man taking digoxin and Siberian ginseng had a high digoxin reading with no signs of toxicity ^{16Reference 16McRae S · 1996Case reportElevated serum digoxin levels in a patient taking digoxin and Siberian ginseng — case reportView study →}. In a trial of 20 elderly patients taking digoxin, 300 mg/day of eleuthero for 8 weeks did not change digoxin levels ^{6Reference 6Cicero AF et al. · 2004RCTEffects of Siberian ginseng (Eleutherococcus senticosus) on elderly quality of life — randomised clinical trialView study →}. Anyone taking digoxin should tell their doctor, so the level can be checked on an assay that is not affected.

Antidepressants. A review of adverse-event reports linked eleuthero taken with antidepressants to bleeding (with duloxetine, paroxetine and sertraline) and to irritability, agitation, headache and dizziness (with agomelatine) ^{29Reference 29Siwek M et al. · 2023ReviewHarder, better, faster, stronger? Retrospective chart review of adverse events of interactions between adaptogens and antidepressant drugsView study →}.

Immune conditions. Because eleuthero raises immune-cell counts ^{1Reference 1Bohn B et al. · 1987RCTFlow-cytometric studies with Eleutherococcus senticosus extract as an immunomodulatory agent — randomised placebo-controlled trialView study →}, there is a theoretical caution in autoimmune disease or alongside immunosuppressant drugs. No case reports support it.

Blood pressure. In rats, a large oral dose lowered blood pressure for a few hours after the first dose only, and the authors suggest watching for dizziness on standing at the start of use ^{24Reference 24Shiokawa Y et al. · 2019Acanthopanax senticosus induces vasorelaxation via endothelial nitric oxide-dependent and -independent pathways — animal studyView study →}. In elderly hypertensive patients, blood pressure did not change ^{6Reference 6Cicero AF et al. · 2004RCTEffects of Siberian ginseng (Eleutherococcus senticosus) on elderly quality of life — randomised clinical trialView study →}.

Acute infection. Eleuthero is traditionally avoided during acute febrile infection.

Drug metabolism. In 12 healthy volunteers, a standardised extract taken for two weeks did not change the activity of CYP2D6 or CYP3A4, two enzymes that clear many prescription drugs ^{33Reference 33Donovan JL et al. · 2003Siberian ginseng (Eleutheroccus senticosus) effects on CYP2D6 and CYP3A4 activity in normal volunteers — clinical pharmacokinetic studyView study →}.

Interactions with anticoagulants, antihypertensives and sedatives have not been formally studied.