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Panax ginseng

Panax ginseng

Herbs & Botanicals

What panax ginseng may help with

Ranked by how strong the human evidence is — best supported first.

Best supportedAlertness and energyLimited evidence· 3 sources

Then, in order

About Panax ginseng

The root of Panax ginseng, sold as white ginseng (dried) or red ginseng (steamed then dried, which changes the ginsenoside profile). Extracts are standardised to total ginsenosides.

Ginseng is among the most-trialled botanicals in the world and the literature is still hard to read. Trials are dominated by Korean groups, frequently supported by the Korean ginseng industry, and use preparations that differ in species, processing and ginsenoside profile. Reviews tend to conclude that effects on fatigue and glucose are plausible but small and inconsistently replicated.

Sold as
Standardised extract capsule, Red ginseng powder, Root slices, Tea, Tincture
Standardised to
Commonly 4–7% total ginsenosides; the best-studied extract is standardised to 4% — a product without this marker may not resemble what was studied.
Also known as
Korean ginseng, Asian ginseng, Red ginseng, Renshen

What the research used

The amounts, forms and durations published trials of Panax ginseng actually administered.

These are the amounts published trials administered — not a recommendation, and not a dose to copy. Trial participants were screened, supervised and given a characterised preparation. What is in a retail bottle is frequently not what was studied, and the amount that suits one person is not general advice.

  • Studied for Fatigue and quality of life

    200–400 mg

    Limited

    Standardised extract · 4% ginsenosides · 4–12 weeks

    A single branded European extract accounts for a large share of these trials, so the results describe that extract rather than ginseng generally.

  • Studied for Glycaemic markers in type 2 diabetes

    1–3 g

    Limited

    Korean red ginseng powder or extract, divided doses · 8–12 weeks

    Trials are small and heavily concentrated in one region; pooled effects on HbA1c are modest and confidence intervals wide.

  • Studied for Erectile function

    900–3000 mg

    Limited

    Korean red ginseng, divided doses · 8–12 weeks

    Meta-analysed trials are small, mostly unblinded to the distinctive taste, and rated low quality by the reviewers who pooled them.

This is general information about food, not medical advice. It cannot diagnose, treat or replace guidance from a clinician who knows your history.

When it was taken

Each window says whether a trial compared it against an alternative, or whether it is convention and pharmacology. Most timing advice is the second kind.

None of the timings below were directly compared in a trial. They reflect how the research happened to dose, or what the pharmacology implies — which is not the same as a timing being better.

  • Morning

    Not enough

    Conventionally taken earlier in the day because of reports of insomnia with evening dosing. This has not been compared in a trial.

    Timing was not directly compared. This reflects convention or how the compound behaves in the body, not a trial showing this window works better.

  • Split through the day

    Limited

    Glycaemic trials generally split the dose across meals, following the reasoning that the effect is on the meal response rather than on fasting state.

    Timing was not directly compared. This reflects convention or how the compound behaves in the body, not a trial showing this window works better.

The evidence in depth

Best supported: Limited

What each association actually rests on, and the papers behind it. A rating describes the state of the research, not how promising the supplement sounds. How we rate evidence.

Alertness and energy

Energy & Metabolism
Limited evidence

Some trials report reduced fatigue and small improvements on attention tasks, most clearly in people who were tired or unwell to begin with. Results in healthy rested adults are inconsistent.

Limited evidence. Early human work, or mostly lab and animal research.

View the 3 sources

Deep research mode adds each paper’s own conclusion and stated limitations.

Blood glucose response

Blood Sugar & Metabolic Health
Limited evidence

Pooled trials suggest small reductions in fasting glucose. The trials are short, mostly small, and heterogeneous in preparation, so the finding is not firm enough to rely on and does not replace glucose-lowering medication.

What may be going on: Ginsenosides have been linked to changes in glucose uptake and insulin signalling in preclinical models.

Limited evidence. Early human work, or mostly lab and animal research.

View the 2 sources

Deep research mode adds each paper’s own conclusion and stated limitations.

Cognitive function

Brain & Cognitive Health
Not enough evidence

Evidence is limited for ginseng and cognition. Individual studies report scattered improvements on isolated test measures, which is the pattern expected from multiple comparisons rather than a real effect.

Not enough evidence. Not enough human research to say anything useful yet.

View the 1 source

Deep research mode adds each paper’s own conclusion and stated limitations.

Things to know

Interactions, contraindications and dose limits, most serious first. Concentrated extracts interact with medication in ways the whole plant does not, so this section carries more weight here than it does on a food page.

  • Interaction

    Warfarin and bleeding risk

    Interacts withWarfarin, antiplatelet drugs

    Ginseng has been reported to reduce the anticoagulant effect of warfarin, and ginsenosides inhibit platelet aggregation in laboratory work. Anyone anticoagulated should not add it without their prescriber knowing.

  • Interaction

    Additive glucose lowering

    Interacts withInsulin, sulfonylureas, metformin

    Combined with insulin, sulfonylureas or other glucose-lowering drugs, ginseng may add to the effect and contribute to hypoglycaemia. Monitoring matters if both are used.

  • Interaction

    Stimulants and MAO inhibitors

    Interacts withMAO inhibitors, caffeine, stimulant medication

    Case reports describe headache, tremor and mania when ginseng was combined with phenelzine, and additive stimulation with caffeine is commonly reported.

  • Worth knowing

    Insomnia, blood pressure and hormone-sensitive conditions

    Insomnia is the most common complaint. Blood pressure has been reported to move in both directions, and weak oestrogenic activity in laboratory work means it is usually avoided in hormone-sensitive breast and uterine conditions.

  • Worth knowing

    Stop before surgery

    Because of the effects on platelets and blood glucose, anaesthetic guidance commonly advises stopping ginseng at least a week before a planned operation.

  • Avoid

    Pregnancy

    Ginsenoside Rb1 caused developmental abnormalities in animal embryo studies, and human safety data are inadequate. It is generally avoided in pregnancy.

Evidence ratings on this page: 2 limited evidence, 1 not enough evidence.

Supplements are sold in the US without pre-market review of efficacy or safety. Nothing on this page is a recommendation to take Panax ginseng, or a dose to follow.