Panax Ginseng for Energy: Small, Inconsistent Effects on Fatigue and a Modest Blood Sugar Dip
Asian ginseng (Panax ginseng) is one of the best-selling herbs for energy, focus and stamina. Pooled trials show a small effect on general tiredness at best, no effect in a cancer-fatigue trial, a modest drop in fasting blood sugar and no change in blood pressure. Here is what the evidence shows, who paid for it, and who should be careful.
By Kymata Health Editorial Published Last checked
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Key takeaways
From 9 sources- A 2023 meta-analysis of 19 trials found no significant overall drop in fatigue with ginseng; ginseng alone helped general, non-disease fatigue with a small effect5.
- In 112 people with advanced cancer, 400 mg of standardized ginseng twice daily for 4 weeks improved fatigue no more than placebo6.
- Across 16 trials (770 people), ginseng lowered fasting blood sugar by 0.31 mmol/L (about 5.6 mg/dL) and did not change HbA1c1; across 17 trials it did not change blood pressure2.
- A Cochrane review judged ginseng's effect on erectile function trivial on validated scores3, and another found no convincing evidence that it sharpens thinking in healthy people4.
- Ginseng sped up the breakdown of a test drug handled by the CYP3A liver enzyme by about a third7, and insomnia is its most common side effect8.
What this article covers
1 evidence profileThe evidence, graded
Pulled from the trial tables in our evidence profiles. Grades follow our evidence-grading policy.
Graded findings
5 rows- CGrade CFatigue severityMixed Overall no significant reduction (SMD −0.36); ginseng reduced general fatigue (SMD −0.48) and formulas helped chronic fatigue; effect sizes small.Panax Ginseng (Asian Ginseng) · Meta-analysis · n=2,413 · 2023 · PMID 36730693
- CGrade CCancer-related fatigueNo effect Fatigue improved equally with ginseng and placebo (7.5 vs 6.5 points, not significant); fewer side effects with ginseng.Panax Ginseng (Asian Ginseng) · RCT · n=112 · 2017 · PMID 28874596
- CGrade CFasting blood glucoseImproved Fasting glucose −0.31 mmol/L versus control.Panax Ginseng (Asian Ginseng) · Meta-analysis · n=770 · 2014 · PMID 25265315
- ∅No effectBlood pressureNo effect No significant effect on systolic, diastolic or mean arterial pressure.Panax Ginseng (Asian Ginseng) · Meta-analysis · n=1,381 · 2016 · PMID 27074879
- CGrade CErectile function (IIEF)Improved IIEF-5 +2.39 points versus placebo (moderate certainty), below the 5-point minimal important difference; judged a trivial effect. Adverse events similar.Panax Ginseng (Asian Ginseng) · Systematic review · n=587 · 2021 · PMID 33871063
Where these trials agree: Panax Ginseng (Asian Ginseng) and fatigue, counted row by row in the Consensus finder.
What Panax ginseng is
Panax ginseng, also called Asian, Korean or Chinese ginseng, is a root used in traditional Chinese medicine; red and white ginseng are the same root prepared in two ways8. Its main active compounds are called ginsenosides8.
It is one of several types of ginseng8, and some pooled reviews below combine several Panax species12. NCCIH notes that most ginseng trials have been small and shorter than 3 months8.
Energy and fatigue: small and inconsistent
A 2023 meta-analysis pooled 19 randomized trials of ginseng or ginseng-containing herbal formulas for fatigue; NCCIH puts the total at 2,413 participants58. Overall, fatigue did not fall significantly compared with controls (standardized mean difference −0.36, 95% CI −0.82 to 0.11)5.
In subgroups, ginseng reduced general, non-disease-specific fatigue (standardized mean difference −0.48), and multi-herb formulas helped chronic fatigue, but the authors described the effect sizes as small5. The review was supported by a US National Cancer Institute grant; one author reported grants from Chinese medicine companies outside the submitted work5.
In a randomized trial, 127 people with advanced cancer and at least moderate fatigue took 400 mg of standardized Panax ginseng extract or placebo twice daily for 28 days, and 112 could be evaluated6. Fatigue scores improved by 7.5 points on ginseng and 6.5 on placebo, a difference that could be chance (P = 0.67), and side effects were less frequent on ginseng6. Its PubMed record does not state who funded it6.
For other herbs people take for stamina and stress, see our explainers on rhodiola, cordyceps and ashwagandha.
Blood sugar and blood pressure
A 2014 meta-analysis of 16 trials lasting at least 30 days found fasting blood glucose 0.31 mmol/L (about 5.6 mg/dL) lower with ginseng than control, in people with and without diabetes1. Fasting insulin, HbA1c and insulin resistance did not change significantly, and two-thirds of the trials ran less than 12 weeks1.
That review was part of a master's thesis funded by a fellowship from the State of Kuwait embassy, with no funder role; one author held grant support for ginseng research from the Canadian Diabetes Association and a Korean government herbal science institute1.
A 2016 meta-analysis of 17 trials (1,381 people) found no significant effect of ginseng on systolic, diastolic or mean blood pressure2. It was funded by the Canadian Institutes of Health Research2. For a supplement with its own blood sugar trials, see chromium.
Libido and focus
A 2021 Cochrane review of 9 trials in 587 men with mild to moderate erectile dysfunction found ginseng raised IIEF-5 scores by 2.39 points over placebo, below the 5-point change considered meaningful, and judged the effect trivial3. Men did report more ability to have intercourse, based on low-certainty evidence3. One review author sits on the editorial board of the Journal of Ginseng Research, and another received consultancy support from the Korea Institute of Oriental Medicine3.
A 2010 Cochrane review of ginseng for thinking and memory found 9 trials but could analyse only 5, and concluded there was no convincing evidence of a cognitive benefit in healthy people4. For libido, see also our explainer on maca; the Panax ginseng page grades each finding.
Who should be careful
Check with a doctor or pharmacist before taking Panax ginseng if any of these apply:
- Medicines broken down by the CYP3A liver enzyme (a pharmacist can say which of yours are): in 12 healthy volunteers, 500 mg of ginseng twice daily for 28 days lowered midazolam exposure by about 34%, and the authors advised close monitoring with narrow-margin CYP3A drugs7.
- Diabetes medicines: ginseng may lower blood sugar, so NCCIH advises people with diabetes to talk with their provider first81.
- Blood thinners: NCCIH notes that Asian ginseng may interfere with blood clotting8. In a small study of 12 healthy men, ginseng did not change warfarin levels or INR, but that does not rule out effects in patients9.
- Autoimmune conditions: Asian ginseng may worsen autoimmune disorders8.
- Trouble sleeping: insomnia is the most common side effect, and severe rash, liver damage and severe allergic reactions have been reported rarely8.
- Pregnancy, breastfeeding and children: some studies suggest it may be unsafe in pregnancy, a ginseng compound caused birth defects in animals, little is known about breastfeeding, and some experts advise against use in infants and children8.
Quick answers
Common questions
4 answersHow long does Panax ginseng take to work?
How much Panax ginseng was used in the trials?
Does ginseng raise blood pressure?
A meta-analysis of 17 trials found no significant effect on blood pressure in either direction2.
Is red ginseng different from Panax ginseng?
Red and white ginseng are both Panax ginseng root, prepared in two different ways8.
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4 capsules: 2,000 mg Panax ginseng C.A. Meyer root extract standardized to 30% ginsenosides; 15 servings per 60 capsules. More than the 800–1,000 mg of extract a day used in the single-product trials we cite.
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References
9 sources. Numbers in the text link here.
Sources cited in this article
9 sources- 1The effect of ginseng (the genus panax) on glycemic control: a systematic review and meta-analysis of randomized controlled clinical trialsPLoS One, 2014 · PMID 25265315
- 2The effect of ginseng (genus Panax) on blood pressure: a systematic review and meta-analysis of randomized controlled clinical trialsJ Hum Hypertens, 2016 · PMID 27074879
- 3Ginseng for erectile dysfunctionCochrane Database Syst Rev, 2021 · PMID 33871063
- 4Ginseng for cognitionCochrane Database Syst Rev, 2010 · PMID 21154383
- 5Ginseng and Ginseng Herbal Formulas for Symptomatic Management of Fatigue: A Systematic Review and Meta-AnalysisJ Integr Complement Med, 2023 · PMID 36730693
- 6A Double-Blind, Randomized, Placebo-Controlled Trial of Panax Ginseng for Cancer-Related Fatigue in Patients With Advanced CancerJ Natl Compr Canc Netw, 2017 · PMID 28874596
- 7Influence of Panax ginseng on cytochrome P450 (CYP)3A and P-glycoprotein (P-gp) activity in healthy participantsJ Clin Pharmacol, 2012 · PMID 21646440
- 8Asian Ginseng: Usefulness and SafetyNCCIH, 2025
- 9Effect of St John's wort and ginseng on the pharmacokinetics and pharmacodynamics of warfarin in healthy subjectsBr J Clin Pharmacol, 2004 · PMID 15089812
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