Herb
    Moderate Evidence

    Korean Ginseng

    Panax ginseng

    TL;DR

    Korean red ginseng has reasonable meta-analytic support for erectile function and for fatigue, particularly cancer-related fatigue, plus small glycaemic effects. Doses of 1-3 g/day of root or standardised extract are typical, and it is stimulating enough that evening dosing disrupts sleep.

    Ideal For

    • Mild to moderate erectile dysfunction
    • Persistent fatigue, including cancer-related fatigue
    • People wanting a stimulating adaptogen rather than a calming one

    Avoid If

    • Taking warfarin
    • Poorly controlled hypertension
    • Insomnia or anxiety disorders
    • Hormone-sensitive cancer, given weak oestrogenic activity
    • Pregnancy

    Frequently Asked Questions

    Overview

    Korean ginseng is the most pharmacologically substantial of the ginsengs and should not be confused with American ginseng or the unrelated Siberian eleuthero. Its clearest signal is in erectile dysfunction: meta-analyses of randomised trials report significant improvement in International Index of Erectile Function scores, with effect sizes smaller than PDE5 inhibitors but consistent across studies, and the mechanism — nitric oxide-mediated corpus cavernosum relaxation — is coherent. The fatigue literature is also reasonably supportive, with the strongest trials in cancer-related fatigue where a large randomised study found benefit. Glycaemic effects exist but are small. Cognitive claims are the weakest, resting on short-term trials with inconsistent endpoints. Red ginseng is processed by steaming, which converts ginsenosides into more bioavailable rare forms such as Rg3, and this is why red preparations are generally preferred. Practically, it is stimulating: take it in the morning, and be aware that ginseng abuse syndrome — insomnia, agitation, raised blood pressure — is a real phenomenon at high chronic doses.

    How It Works

    • Ginsenosides upregulate endothelial nitric oxide synthase
    • Modulates HPA axis and cortisol response to stress
    • Improves mitochondrial efficiency, relevant to fatigue
    • Steaming converts ginsenosides to more absorbable rare forms

    Quick Facts

    • Meta-analytic support for erectile function improvement
    • Strongest fatigue data is in cancer-related fatigue
    • Take in the morning — it disrupts sleep
    • Reduces warfarin effectiveness

    Benefits & Outcomes

    No linked outcomes yet. Research is ongoing.

    Health Concerns Addressed

    Erectile Dysfunction

    condition
    Likely effective
    Moderate Evidence
    Effectiveness 3/5

    A consistent but modest improvement in erectile function across meta-analyses. Worth an eight-week trial for mild cases; not a substitute for a PDE5 inhibitor.

    Supporting Research
    18 studies

    Red ginseng for treating erectile dysfunction: a systematic review

    Score: 6/10
    2008
    systematic_review
    n=349

    Jang DJ, Lee MS, Shin BC +2 more

    Red ginseng was significantly more effective than placebo on erectile function scores, though the total number of trials and sample sizes were small.

    View source

    Red ginseng for treating erectile dysfunction: a systematic review

    Score: 7/10
    2008
    systematic_review
    n=349

    Jang DJ, et al.

    Collectively these RCTs provide suggestive evidence for the effectiveness of red ginseng in the treatment of erectile dysfunction.

    View source

    Single doses of Panax ginseng (G115) reduce blood glucose levels and improve cognitive performance during sustained mental activity

    Score: 6/10
    2005
    crossover
    n=30

    Reay JL, et al.

    Panax ginseng can improve performance and subjective feelings of mental fatigue during sustained mental activity.

    View source

    Ginseng for Erectile Dysfunction: A Cochrane Systematic Review

    Score: 9/10
    2022
    systematic_review

    Lee HW, Lee MS, Kim TH +3 more

    Ginseng appears to have a trivial effect on erectile dysfunction when compared to placebo based on the Erectile Function Domain of the International Index of Erectile Function (IIEF)-15 instrument (mean difference [MD] 3.52, 95% confidence interval [CI] 1.79 to 5.25; I²=0%; 3 studies; low CoE)

    View source

    Ginseng for erectile dysfunction: a Cochrane systematic review

    Score: 8/10
    2022
    systematic_review
    n=587

    Lee HW, Lee MS, Kim TH +4 more

    Red ginseng improved IIEF erectile function scores compared with placebo, but the certainty of evidence was very low owing to small, poorly reported trials.

    View source

    Ginseng for cognition

    Score: 9/10
    2010
    systematic_review
    n=9

    Geng J, et al

    Currently, there is a lack of convincing evidence to show a cognitive enhancing effect of Panax ginseng in healthy participants.

    View source

    A Double-Blind, Randomized, Placebo-Controlled Trial of Panax Ginseng for Cancer-Related Fatigue in Patients With Advanced Cancer

    Score: 8/10
    2017
    rct
    n=127

    Yennurajalingam S, et al

    Both PG and placebo result in significant improvement in CRF. PG was not significantly superior to placebo after 4 weeks of treatment. There is no justification to recommend the use of PG for CRF.

    View source

    Beneficial effects of natural products on female sexual dysfunction: A systematic review and meta-analysis

    Score: 6/10
    2021
    meta_analysis

    Sha'ari N, Woon LS, Sidi H +1 more

    Panax ginseng was found to be effective in treating sexual arousal (SMD = 0.54, 95% CI = 0.11 - 0.97, p = 0.014) and sexual desire (SMD = 0.59, 95% CI = 0.27 - 0.90, p < 0.001)

    View source

    Herbal Dietary Supplements for Erectile Dysfunction: A Systematic Review and Meta-Analysis

    Score: 9/10
    2018
    meta_analysis
    n=2080

    Borrelli F, Colalto C, Delfino DV +2 more

    Ginseng significantly improved erectile function... standardized mean difference [SMD] 0.43; 95% confidence interval [CI] 0.15-0.70; P < 0.01

    View source

    Effects of Ginseng on Cognitive Function: A Systematic Review and Meta-Analysis

    Score: 7/10
    2024
    meta_analysis
    n=671

    Zeng Y, et al.

    Ginseng did not have a positive effect on overall cognition, attention, and executive function.

    View source

    Ginseng and health outcomes: an umbrella review

    Score: 8/10
    2023
    systematic_review
    0

    Zhou Z, Wang Y, Chen S +1 more

    Most reported benefits were supported by low or very low certainty evidence; the most consistent signals were small improvements in fasting glucose and fatigue.

    View source

    Ginseng and Ginseng Herbal Formulas for Symptomatic Management of Fatigue: A Systematic Review and Meta-Analysis

    Score: 7/10
    2023
    meta_analysis
    n=19

    Li X, et al

    Pooled analyses found no significant reduction in fatigue severity with ginseng versus controls.

    View source

    Using ginseng for menopausal women's health care: A systematic review of randomized placebo-controlled trials

    Score: 6/10
    2022
    systematic_review
    n=515

    Lee HW, Ang L, Lee MS

    The meta-analysis of three other studies failed to show that ginseng was beneficial for sexual function (n = 491; SMD: 0.31, 95% CI: -0.30 to 0.92, P = 0.32)

    View source

    Effects of Korean red ginseng on glycemic control in subjects with impaired fasting glucose, impaired glucose tolerance or type 2 diabetes: a randomised controlled trial with null primary outcome

    Score: 8/10
    2019
    rct
    n=72

    Vuksan V, Xu ZZ, Jovanovski E +7 more

    HbA1c did not differ significantly from placebo, although plasma glucose and insulin indices showed small favourable changes.

    View source

    Nutraceutical interventions for erectile dysfunction: a systematic review and network meta-analysis

    Score: 9/10
    2024
    meta_analysis

    Barbonetti A, Tienforti D, Antolini F +3 more

    their efficacy remains doubtful, and the choice of one substance over the other is challenged by the dearth of head-to-head comparative studies

    View source

    Study of the efficacy of Korean red ginseng in the treatment of erectile dysfunction

    Score: 6/10
    2007
    crossover
    n=60

    Andrade E, de Mesquita AA, Claro Jde A +4 more

    IIEF-5 scores improved significantly during ginseng treatment relative to placebo, with sexual satisfaction also increasing.

    View source

    Efficacy and safety of red ginseng extract powder in patients with erectile dysfunction: multicenter, randomized, double-blind, placebo-controlled study

    Score: 7/10
    2009
    rct
    n=119

    Ham WS, Kim WT, Lee JS +6 more

    IIEF total scores improved with red ginseng versus placebo, though several individual domain differences did not reach significance.

    View source

    Panax ginseng for chronic fatigue and idiopathic fatigue: a systematic review of randomised controlled trials

    Score: 7/10
    2018
    systematic_review
    n=500

    Arring NM, Millstine D, Marks LA +1 more

    Ginseng showed small improvements in fatigue in cancer-related and chronic-illness populations, but trials were few, small and heterogeneous.

    View source

    Safety Information

    Potential Side Effects

    Insomnia is the most common complaint, especially with afternoon dosing. Also headache, nervousness, raised blood pressure, gastrointestinal upset and, in women, breast tenderness or menstrual changes.

    Contraindications

    Avoid with warfarin owing to reduced INR. Use caution in uncontrolled hypertension and in hormone-sensitive conditions. Not recommended in pregnancy.

    Drug Interactions

    • Warfarin — reduced INR and anticoagulant effect
    • MAO inhibitors such as phenelzine — reports of mania and headache
    • Insulin and antidiabetic drugs — additive glucose lowering
    • Stimulants and caffeine — additive overstimulation

    Pregnancy & Breastfeeding

    Pregnancy: likely_unsafe

    Breastfeeding: insufficient_data

    Dosage Guidelines

    Dosage Used in Studies

    1000-3000 mg

    Best Time to Take

    Morning, ideally before noon

    Best Form

    Korean red ginseng standardised to ginsenosides

    Bioavailability

    Ginsenosides require gut bacterial conversion to active metabolites such as compound K, so response varies with microbiome composition.

    Forms Compared

    Korean red ginseng

    White ginseng

    Standardised extract

    Food & Timing

    With or without food; avoid late in the day.

    Medical Disclaimer

    The information provided on this website is for educational and informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or before starting any supplement regimen.

    Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.