Supplement analysis backed by scientific evidence · PT

← All supplements
Limited evidenceStress & mood

Eleuthero (Siberian Ginseng)

Sold as an adaptogen for stamina and stress resistance, but the best controlled trial found no overall benefit for chronic fatigue. The evidence base is thin, dated, and dominated by Russian and Chinese studies of poor methodological quality.

What the science says

  • Chronic fatigue Limited evidence

    In the only substantial Western RCT, 96 adults with at least 6 months of unexplained fatigue took eleuthero or placebo for 2 months. Fatigue improved substantially in both arms with no significant difference in the full sample; a post hoc subgroup with less severe fatigue improved at 2 months (p = 0.04, unadjusted for multiple comparisons). The authors' own conclusion was that overall efficacy was not demonstrated.

  • Acute ischaemic stroke (injectable Acanthopanax in China) Limited evidence

    A Cochrane review of 13 trials (962 participants) found apparent improvement in neurological deficit (RR 1.22, 95% CI 1.15-1.29), but every trial was at high risk of bias and none reported death or dependency. The reviewers judged the data inadequate to draw reliable conclusions.

  • Exercise performance and immune function Limited evidence

    Small crossover trials in cyclists and runners give conflicting results, with several showing no change in VO2max, time to exhaustion or substrate use. No meta-analysis supports an ergogenic or immune-boosting effect.

Dosage & safety

Studied doseTypical supplementation is 300-1200 mg/day of dried root extract, often standardized to around 0.8% eleutherosides B and E, or 2-4 g/day of dried root. The chronic fatigue RCT used a standardized extract taken daily for 2 months. Traditional practice cycles use for 6-8 weeks with breaks.
SafetyUsually well tolerated, but insomnia, irritability, tachycardia and increases in blood pressure have been reported; avoid or monitor closely with uncontrolled hypertension. A well-known case of apparent digoxin toxicity was traced to eleuthero interfering with the digoxin immunoassay rather than true toxicity, so it can confound therapeutic drug monitoring. Possible additive effects with anticoagulants, antidiabetic drugs and sedatives. Despite the name, it is not Panax ginseng, and US labelling guidance discourages the term Siberian ginseng for exactly that reason. Avoid in pregnancy and breastfeeding for lack of data.

Scientific references

Where to buy

Nature's Answer, Eleuthero Root Extract, Alcohol-Free, 160 mg, 2 fl oz (60 ml)

View on iHerb

Referral link — this site may earn a commission on purchases.

Related in Stress & mood