A reference work, not a recommendation to use: this profile describes mechanism and evidence and does not replace medical advice. The claims come from marketing and forums and are tested here, not endorsed.

Claims checked

  • Better concentration and memory performance

    Mixed results

    Cognition & focus · healthy · Human, randomised

    Cochrane: no convincing evidence in healthy people, data not poolable [4]. Meta-analysis with mixed populations: small memory effect (SMD 0.19), none on attention or executive functions [5]. Single doses improved memory in one study but slowed attention [6].

  • More energy, less fatigue

    Single unconfirmed finding

    Energy & metabolism · mixed: healthy people and patients (small studies) · Human, randomised

    Meta-analysis: fatigue reduced (SMD 0.34), but from only four small studies; the authors consider the evidence insufficient [7].

  • Increases physical performance

    No benefit

    Muscle & performance · healthy · Human, randomised

    Eight RCTs without an effect on physical performance (SMD −0.01) [7].

  • Improves potency and erection

    Small benefit

    Libido & sexual function · Patients: mild to moderate erectile dysfunction · Human, randomised

    Cochrane (nine studies, 587 men): effect on erectile function below the clinically relevant threshold; more frequent self-reported ability to have intercourse; certainty mostly low [8].

  • Lowers blood sugar

    Small benefit

    Energy & metabolism · mixed: healthy people and patients with diabetes · Human, randomised

    Meta-analysis of 16 RCTs (genus Panax): fasting blood glucose −0.31 mmol/l, HbA1c and insulin unchanged; mostly short studies [9].

Mechanism of action

Evidence map: Panax Ginseng

Each line stands for a published finding; line style and color show where it comes from. The filter hides weaker evidence levels. Sources: see references.

The ginsenosides, a structurally diverse group of steroid saponins, are regarded as the main active compounds of ginseng. Laboratory studies describe effects at numerous cell membrane receptors and at intracellular steroid receptors; different ginsenosides act differently, and a single ginsenoside can trigger several effects in the same tissue. According to this review, many mechanisms are unresolved, and the pharmacology is considered complex [1].

Whether the ginsenosides themselves reach the body is questionable. In a pilot study with only two people, after intake of a standardized extract, plasma and urine contained mainly breakdown products that were not present in the extract: Rh1 and F1 from the protopanaxatriol ginsenosides and compound K, the main breakdown product of the protopanaxadiol ginsenosides formed by gut bacteria; Rb1 itself was detectable in only one person [2]. In addition, quality varies: in 25 commercial products from the USA (Panax and Eleutherococcus products), the plant species was correct, but the content of marker compounds deviated markedly from the label; ginsenoside content varied 15-fold between capsules and 36-fold between liquid products [3].

On cognition, a Cochrane review found nine randomized trials, eight of them in healthy people; the data could not be pooled, and the authors saw no convincing evidence of an improvement in healthy people [4]. A more recent meta-analysis of 15 trials with mixed populations (healthy people, cognitive impairment, schizophrenia, Alzheimer’s disease) found a small effect on memory (SMD 0.19) but none on overall cognition, attention, or executive functions [5]. In an early crossover study with 20 young adults, a medium single dose of a manufacturer’s extract improved memory quality, whereas the lowest and the highest dose slowed attention, and subjective alertness decreased [6].

Against fatigue, a meta-analysis of four small studies showed an effect (SMD 0.34), and on physical performance, eight studies showed none (SMD −0.01) [7]. In mild to moderate erectile dysfunction, ginseng improved erectile function only trivially according to a Cochrane review, below the clinically relevant threshold; however, the men more often reported being able to have intercourse [8]. Across 16 studies in people with and without diabetes, fasting blood glucose fell by 0.31 mmol/l, while HbA1c and insulin remained unchanged; one author received research funding for ginseng research, including from a Korean agricultural authority [9]. American ginseng, a related species, weakened the effect of the anticoagulant warfarin in an RCT with 20 healthy people [10].

Assigned to the site of action Skeletal muscle fibre: insulin receptor to GLUT4, creatine kinase, carnosine, MCT and mitochondrion; not drawn in its figure: finding on fasting blood glucose, no target in muscle.

Targets

TargetTypeActionKey dataEvidence
Membrane receptors and intracellular steroid receptorsReceptorBindingmany inconsistent effects of individual ginsenosides (review of laboratory findings) Laboratory[1]
Bacterial breakdown of ginsenosides in the gutEnzymeBindingmainly compound K, Rh1, and F1 in plasma (n = 2) Human, non-randomised[2]
Fasting blood glucoseOtherInhibitor−0.31 mmol/l (meta-analysis of 16 RCTs; HbA1c unchanged) Human, randomised[9]

Effect profile

Which signaling systems the compound affects according to current data. ↑ enhanced, ↓ dampened, ≈ modulated, ○ no effect; dots = evidence level.

  • Dopamineno data
  • Noradrenalineno data
  • Serotoninno data
  • Acetylcholineno data
  • Glutamate · AMPAno data
  • Glutamate · NMDAno data
  • GABAno data
  • Histamineno data
  • Orexinno data
  • Adenosineno data
  • Opioidsno data
  • Melatoninno data
  • Neurotrophinsno data
  • Blood flowno data
  • Nitric oxideno data
  • Energy metabolismunclear · Fatigue reduced in four small studies, physical performance unchanged[7]
  • Insulin · glucose↓ · Fasting blood glucose slightly lowered, HbA1c, insulin, and insulin resistance unchanged[9]
  • Inflammation · oxidativeno data
  • Stress axisno data
  • Testosterone axisno data
  • Endocannabinoidsno data
  • Autophagy · senescenceno data
  • Immune systemno data
  • Lipid metabolismno data
  • Coagulation · fibrinolysisno data
  • Methylationno data

Routes of administration and bioavailability

How much of a compound reaches the blood or target tissue depends on the route into the body and on the dosage form. All routes of administration explained

  • Oral (swallowed) · standardized root extract

    Ginsenosides themselves barely, mainly breakdown products (compound K, Rh1, F1) in plasma

    Pilot study with two people; breakdown by gastric acid and gut bacteria [2].

    Human, non-randomised

  • Oral (swallowed) · Commercial products (capsules, liquid extracts)

    Ginsenoside content varying 15-fold (capsules) and 36-fold (liquid products)

    Content deviated markedly from the label; studies should therefore analyze the products [3].

    Laboratory

Human studies

  • Cochrane review, cognition

    systematic review of 9 RCTs (5 analyzable) · healthy (8 of 9 studies)

    Measured: cognitive function

    Result: No convincing evidence in healthy people; pooling not possible because of heterogeneity.[4]

    Human, randomised

  • Meta-analysis, cognition

    Meta-analysis of 15 RCTs · healthy people and patients (mixed) · n = 671

    Measured: memory, overall cognition, attention, executive functions

    Result: Memory SMD 0.19; other domains without an effect.[5]

    Human, randomised

  • Acute single doses

    double-blind, placebo-controlled, crossover · healthy (young adults) · n = 20 · single doses

    Measured: memory and attention factors, mood

    Result: Medium dose: better memory quality; low and high dose: slower attention; alertness decreased.[6]

    Human, randomised

  • Meta-analysis, fatigue and performance

    Meta-analysis of 12 RCTs · healthy people and patients (mixed) · n = 630

    Measured: fatigue, physical performance

    Result: Fatigue SMD 0.34 (4 studies); performance SMD −0.01 (8 studies).[7]

    Human, randomised

  • Cochrane review, erectile dysfunction

    systematic review of 9 RCTs · Patients: mild to moderate erectile dysfunction · n = 587 · up to 12 weeks

    Measured: IIEF, ability to have intercourse

    Result: IIEF erectile domain +3.52 (below the clinically relevant threshold of 4); ability to have intercourse RR 2.55.[8]

    Human, randomised

  • Meta-analysis, blood glucose

    Meta-analysis of 16 RCTs (≥ 30 days) · healthy people and patients: diabetes · n = 770 · mostly under 12 weeks

    Measured: Fasting blood glucose, HbA1c, insulin

    Result: Fasting blood glucose −0.31 mmol/l; other values unchanged.[9]

    Human, randomised

  • Interaction with warfarin (American ginseng)

    RCT, double-blind, placebo-controlled · healthy · n = 20 · 4 weeks

    Measured: INR, warfarin level

    Result: INR peak and warfarin level decreased.[10]

    Human, randomised

Risks and warnings

  • Variable product quality

    In 25 commercial products (Panax and Eleutherococcus products), the content of marker compounds deviated markedly from the label; ginsenoside content varied 15-fold between capsules and 36-fold between liquid products [3].

    Laboratory

  • Adverse events

    In the studies on erectile dysfunction, hardly any difference from placebo (RR 1.45, wide confidence interval) [8]; no serious adverse events in the Cochrane review on cognition [4].

    Human, randomised

Interactions

  • Warfarin: American ginseng (Panax quinquefolius) lowered INR and warfarin levels in 20 healthy people [10]; not tested here for Panax ginseng itself.

Fact check: common claims

  • not supported

    “Ginseng improves concentration and memory”

    Cochrane sees no convincing evidence in healthy people [4]; the small memory effect in a more recent meta-analysis comes from mixed populations [5].

  • refuted

    “Ginseng is a natural remedy for more endurance and strength”

    Eight RCTs without an effect on physical performance [7].

  • partly supported

    “Ginseng works like a natural potency remedy”

    In erectile dysfunction only trivial improvements on validated scales, but more frequent self-reported ability to have intercourse; comparison with PDE-5 inhibitors is lacking [8].

  • refuted

    “A ginseng product contains what is stated on the package”

    The content of marker compounds in 25 commercial products (Panax and Eleutherococcus products) deviated markedly from the label [3].

Pharmacokinetics

Absorption
Ginsenosides are broken down in the gastrointestinal tract; mainly compound K, Rh1, and F1 appear in plasma (pilot study, n = 2) [2].
Half-life
Not verified.
Metabolism
Hydrolysis by gastric acid and gut bacteria; compound K as the main metabolite of the protopanaxadiol ginsenosides [2].
Entry into the brain
Not verified.

Legal status

Germany
Not verified.
EU
Not verified.
USA
Not verified.

Related compounds

Ashwagandhasame class

Open questions

  • Which ginsenosides or breakdown products reach the brain in appreciable amounts?
  • Do contradictory results depend on the ginsenoside profile of the extracts used?
  • Can the small memory effect be confirmed in large studies in healthy people?

References

  1. Attele AS, Wu JA, Yuan CS. Ginseng pharmacology: multiple constituents and multiple actions. Biochem Pharmacol. 1999;58(11):1685–93. doi:10.1016/s0006-2952(99)00212-9 · PubMed
  2. Tawab MA, Bahr U, Karas M, Wurglics M, Schubert-Zsilavecz M. Degradation of ginsenosides in humans after oral administration. Drug Metab Dispos. 2003;31(8):1065–71. doi:10.1124/dmd.31.8.1065 · PubMed
  3. Harkey MR, Henderson GL, Gershwin ME, Stern JS, Hackman RM. Variability in commercial ginseng products: an analysis of 25 preparations. Am J Clin Nutr. 2001;73(6):1101–6. doi:10.1093/ajcn/73.6.1101 · PubMed
  4. Geng J, Dong J, Ni H, Lee MS, Wu T, Jiang K, et al. Ginseng for cognition. Cochrane Database Syst Rev. 2010;(12):CD007769. doi:10.1002/14651858.CD007769.pub2 · PubMed
  5. Zeng M, Zhang K, Yang J, Zhang Y, You P, Yan L, et al. Effects of ginseng on cognitive function: a systematic review and meta-analysis. Phytother Res. 2024;38(12):6023–34. doi:10.1002/ptr.8359 · PubMed
  6. Kennedy DO, Scholey AB, Wesnes KA. Dose dependent changes in cognitive performance and mood following acute administration of ginseng to healthy young volunteers. Nutr Neurosci. 2001;4(4):295–310. doi:10.1080/1028415x.2001.11747370 · PubMed
  7. Bach HV, Kim J, Myung SK, Cho YA. Efficacy of ginseng supplements on fatigue and physical performance: a meta-analysis. J Korean Med Sci. 2016;31(12):1879–86. doi:10.3346/jkms.2016.31.12.1879 · PubMed
  8. Lee HW, Lee MS, Kim TH, Alraek T, Zaslawski C, Kim JW, et al. Ginseng for erectile dysfunction. Cochrane Database Syst Rev. 2021;4(4):CD012654. doi:10.1002/14651858.CD012654.pub2 · PubMed
  9. Shishtar E, Sievenpiper JL, Djedovic V, Cozma AI, Ha V, Jayalath VH, et al. The effect of ginseng (the genus Panax) on glycemic control: a systematic review and meta-analysis of randomized controlled clinical trials. PLoS One. 2014;9(9):e107391. doi:10.1371/journal.pone.0107391 · PubMed
  10. Yuan CS, Wei G, Dey L, Karrison T, Nahlik L, Maleckar S, et al. Brief communication: American ginseng reduces warfarin's effect in healthy patients: a randomized, controlled trial. Ann Intern Med. 2004;141(1):23–7. doi:10.7326/0003-4819-141-1-200407060-00011 · PubMed
How this profile was checked

Last reviewed: 2026-10-24. All sources with a DOI or PMID were resolved automatically via Crossref or doi.org and PubMed.

Translated from the German profile (version of 2026-10-24); translation checked on 2026-10-26.

Checked

  • Local recheck on October 24, 2026: abstracts [3], [7], [8], and [9] read again, key numbers confirmed. On [3]: the 25 products also included Eleutherococcus products; the 15-fold and 36-fold variation concerns ginsenosides in capsules and liquid products, respectively. Statements specified accordingly
  • All abstracts read via PubMed (efetch); DOIs and PMIDs reconciled with tools/pruefe_profile.py.
  • Key numbers from the abstracts: ginsenosides as steroid saponins with multiple targets [1]; n = 2, Rh1, F1, compound K, Rb1 in one person, extract Ginsana (Pharmaton) [2]; 25 products, 15-fold and 36-fold variation [3]; 9 RCTs, 8 in healthy people, 5 analyzable, no pooling [4]; 15 RCTs, 671 participants, memory SMD 0.19 [5]; n = 20, extract G115 (Pharmaton), memory quality better, attention slower [6]; 12 RCTs, 630 participants, SMD 0.34 and −0.01 [7]; 9 studies, 587 men, MD 3.52 (MCID 4) and 2.39 (MCID 5), RR 2.55, RR 1.45 for adverse events [8]; 16 studies, −0.31 mmol/l [9]; n = 20, INR −0.19 [10].
  • From the full text (PMC4180277) [9]: one author received research funding for ginseng research from the Canadian Diabetes Association and the National Institute of Horticultural & Herbal Science (RDA, Korea) and is a co-owner of a contract research organization.
  • ClinicalTrials.gov: 244 entries for “Panax ginseng” (October 23, 2026).

Not verified

  • Legal status (medicinal product, traditional herbal medicinal product, food supplement) not checked.
  • Conflicts of interest of [6] (manufacturer’s extract, one author connected to the test developer?) not checked against the full text.
  • How many of the studies in [7] and [9] used Panax ginseng and how many used American ginseng.
  • Whether the warfarin interaction [10] also applies to Panax ginseng.
  • Half-life and CNS penetration of the ginsenoside metabolites in humans.

No dosages, no sources of supply. This information does not replace medical advice.

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