Asian Ginseng

What Is Asian Ginseng?

Asian ginseng is a very useful herb. It acts as a regulator for the endocrine system, offering long-term secondary benefits on the cardiovascular and neurological systems.

It’s considered a Qi tonic in traditional Chinese medicine.

Ginseng works from the top down as an adaptogen. It primarily supports the metabolic, reproductive, neurological, and cardiovascular systems.

The main drawback is cost: ginseng is slow to grow and the wild plant was nearly harvested to extinction, so the market now runs on cultivated root.

What Is Asian Ginseng Used For?

Ginseng is mainly used as an adaptogen to increase energy, regulate blood glucose levels, and improve the ability to respond to and resist stress. It’s a popular adjunctive therapy with cancer therapies to increase energy, and alongside metabolic syndrome or diabetes to help with glucose regulation in both type I and type II diabetics.

Ginseng is and always has been a popular herb for male-specific problems, especially those associated with age. Erectile dysfunction, cognitive decline, low libido, male infertility, and cardiovascular disease are all common uses for ginseng, especially in Asia where the plant originates.

Some of the more modern uses of ginseng revolve around its use as a cognitive performance enhancer. The ginsenosides prevalent in the plant have been well studied for use in nootropic formulas. As a result, we are beginning to see an increase in the use of ginseng for this application.

Traditional Uses

Western Herbal Medicine

In western herbal medicine, it’s used as a mild stomachic, tonic, and stimulant for anorexia and digestive complaints. It was also useful for mental exhaustion ^{39Reference 39Bone K · 2013Principles and Practice of Phytotherapy}.

The British herbal pharmacopeia lists ginseng as a thymoleptic, sedative, demulcent, stomachic, an aphrodisiac. It’s indicated for neurasthenia, neuralgia, insomnia, and hypotonia. ^{41Reference 41Hempen et al. · 2009A Materia Medica for Chinese Medicine: Plants, Minerals, and Animal Products. (Pg}.

The eclectics used ginseng for cerebral anemia, asthma, convulsions, paralysis, and urinary gravel. ^{39Reference 39Bone K · 2013Principles and Practice of Phytotherapy}.

The Traditional Uses Included

Prostration, heart conditions, asthma, cold limbs, poor circulation, digestive complaints, anxiety, neuralgia, low libido, fatigue, liver disease, infertility. ^{39,42,43Reference 39Bone K · 2013Principles and Practice of PhytotherapyReference 42British Herbal Medicine Association · 1983British Herbal PharmacopoeiaReference 43Panax ginseng · 2009ReviewAlternative Medicine Review : A Journal Of Clinical Therapeutic, 14(2), 172-6}.

Traditional Chinese Medicine

Asian ginseng has an extensive history of use in the traditional Chinese medical system where its primary purpose was to tonify Qi, promote longevity, and generate fluid. (see below for more). ^{39Reference 39Bone K · 2013Principles and Practice of Phytotherapy}.

Pin Yin

Ren Shen

Taste

Sweet, bitter ^{41Reference 41Hempen et al. · 2009A Materia Medica for Chinese Medicine: Plants, Minerals, and Animal Products. (Pg}

Energy

Warm ^{41Reference 41Hempen et al. · 2009A Materia Medica for Chinese Medicine: Plants, Minerals, and Animal Products. (Pg}

Channels

Spleen, lung, heart ^{41Reference 41Hempen et al. · 2009A Materia Medica for Chinese Medicine: Plants, Minerals, and Animal Products. (Pg}

Actions

Tonifies Qi, generates fluids, tonifies the lungs, and stomach, strengthens the spleen, calms the spirit (shen) ^{39,41Reference 39Bone K · 2013Principles and Practice of PhytotherapyReference 41Hempen et al. · 2009A Materia Medica for Chinese Medicine: Plants, Minerals, and Animal Products. (Pg}.

Indications

Collapsed Qi.

Dose

1-10g decocted for 3 hours or more ^{41Reference 41Hempen et al. · 2009A Materia Medica for Chinese Medicine: Plants, Minerals, and Animal Products. (Pg}.

Contraindications

Hot conditions (use American ginseng instead), acute inflammatory conditions ^{40Reference 40Hoffmann · 2003Medical herbalism: The science and practice of herbal medicine}, yin deficiency with heat or fire, damp-heat, ascendant liver yang with hypertension ^{41Reference 41Hempen et al. · 2009A Materia Medica for Chinese Medicine: Plants, Minerals, and Animal Products. (Pg}.

Botanical Information

Ginseng is a member of the Araliaceae family of plants, otherwise known as the ivy family. This family comprises some 254 species (some report as much as 700 species), including several well-known medicinal species. Some of the most notable species include:

• Oplopanax horridus (Devil’s club)
• Hedera helix (English ivy)
• Eleutherococcus senticosus (Siberian ginseng)
• Tetrapanax papyriferum (Ricepaper plant)
• Aralia nudicaulis (Wild sarsaparilla)

Habitat, Ecology & Distribution

Asian ginseng originated from the mountainous regions of China, Japan, Korea, and Russia ^{39,43Reference 39Bone K · 2013Principles and Practice of PhytotherapyReference 43Panax ginseng · 2009ReviewAlternative Medicine Review : A Journal Of Clinical Therapeutic, 14(2), 172-6}.

Harvesting, Collection & Preparation

Due to some serious over-harvesting of ginseng from the wild, the majority of ginseng root on the market is farmed ginseng. Although generally regarded as weaker than wildcrafted ginseng, the chemical makeup is similar and is an acceptable substitute.

Farming ginseng is no easy venture, and thus the cost of the root is still quite expensive despite large-scale farms. Cultivation requires a substantial amount of labor, and the roots must be at least four years old before any profit can be made.

There are a lot of stories around ginseng wildcrafters from the past. Many of which describe the ability for ginseng to hide from foragers. It’s an extremely modest plant, with even the oldest herbs only growing four leaflets. They seemed to blend right into the surrounding foliage, and often a forager could be standing in an entire plot of ginseng and not even notice.

Pharmacology & Research

Panax ginseng is among the most heavily investigated botanicals in the world: PubMed returns hundreds of human trials and dozens of systematic reviews and meta-analyses, and over 200 registered clinical trials list it as an intervention. Despite that volume, the evidence is more equivocal than the herb’s reputation suggests — the strongest, most replicated human signals are modest reductions in fasting blood glucose and a consistent (if small) anti-fatigue effect, with erectile dysfunction and memory close behind. Much of the literature is limited by short trial duration, small samples, heterogeneous and often proprietary extracts (G115, Korean Red Ginseng, Cereboost), and frequent conflation of Asian ginseng with American ginseng (Panax quinquefolius), whose ginsenoside profile and clinical effects differ. Read every result below with the preparation in mind: a standardised-extract finding does not transfer to a decoction or whole-root powder.

0. Evidence by indication

Support is an experimental score I’m building — a composite weighted by study type (human > animal > in vitro > review) and study volume. It’s a beta: a fast way to rank strength of evidence at a glance, not a validated metric, and I’ll keep honing the formula over time. Each indication name links down to its write-up.

Indication	Support	Rests on
Glycemic control	███████░░░ 73%	Multiple RCT meta-analyses; small but significant fasting-glucose drop, short trials
Fatigue	███████░░░ 66%	Several SRs/meta of RCTs; consistent modest effect across chronic illness and cancer
Erectile dysfunction	██████░░░░ 64%	Cochrane + earlier meta; effect real but small, low certainty, Korean Red Ginseng
Cognition & memory	██████░░░░ 61%	RCT meta; memory improves, global cognition does not; mixed extracts
Immune / cold & flu	██████░░░░ 58%	One good Asian-ginseng vaccination RCT; cold-prevention data mostly American ginseng
Cancer chemoprevention	██████░░░░ 56%	Consistent Korean cohort/case-control; observational only, confounding likely
Cardiovascular risk factors	█████░░░░░ 54%	BP neutral in meta; inflammatory/vascular markers improve, lipids mixed
Adaptogenic / stress resistance	█████░░░░░ 52%	HPA-axis mechanism + animal anti-stress; thin direct human data
Menopausal symptoms	████░░░░░░ 43%	Small RCTs, mixed; sexual-function signal, objective GSM measures null

1. Glycemic control

This is Asian ginseng’s most robust human signal. A systematic review and meta-analysis of 16 randomised controlled trials (n≈770 for fasting glucose) found ginseng significantly reduced fasting blood glucose versus control (mean difference −0.31 mmol/L), though it did not significantly change fasting insulin, HbA1c, or insulin resistance (HOMA-IR) overall; most trials were short (two-thirds under 12 weeks) and enrolled people with relatively good baseline glycemic control, which likely blunted the measurable effect ^{1Reference 1Shishtar et al. · 2014Meta-analysisThe effect of ginseng (the genus Panax) on glycemic control — systematic review and meta-analysis of randomised controlled trialsView study →}. A later meta-analysis focused on prediabetes and type 2 diabetes (20 RCTs) reported significant reductions in fasting glucose, total cholesterol, IL-6 and HOMA-IR, with clearer benefit at doses of ≥2 g/day ^{2Reference 2Jovanovski et al. · 2022Meta-analysisThe efficacy of ginseng (Panax) on human prediabetes and type 2 diabetes mellitus — systematic review and meta-analysisView study →}. Acute dosing also matters: a single 200–400 mg dose of the G115 extract lowered blood glucose during a sustained mental-effort task ^{3Reference 3Reay et al. · 2005RCTSingle doses of Panax ginseng (G115) reduce blood glucose levels and improve cognitive performance during sustained mental activity — RCTView study →}.

Gap: effects are small, mostly on fasting glucose rather than HbA1c, and trials are short with heterogeneous extracts — no long-term outcome data on diabetic complications.

2. Fatigue

Fatigue reduction is a consistent, if modest, finding across several syntheses of human trials. A meta-analysis of 12 RCTs (630 participants) found a statistically significant effect on fatigue reduction (standardised mean difference 0.34) and some benefit for physical performance ^{5Reference 5Bach et al. · 2016Meta-analysisEfficacy of ginseng supplements on fatigue and physical performance — meta-analysis of RCTsView study →}. A broader systematic review concluded that both Asian and American ginseng may reduce fatigue, particularly in people with chronic illness ^{4Reference 4Arring et al. · 2018Systematic reviewGinseng as a treatment for fatigue — systematic reviewView study →}, and a 2023 systematic review and meta-analysis of ginseng and ginseng formulas reached a similar conclusion for symptomatic fatigue management ^{6Reference 6Zhou et al. · 2023Meta-analysisGinseng and ginseng herbal formulas for symptomatic management of fatigue — systematic review and meta-analysisView study →}. In the cancer setting specifically, a review of trials in cancer-related fatigue found suggestive but limited evidence, with American ginseng (Wisconsin) carrying much of the positive signal ^{7Reference 7Pergolizzi et al. · 2021Systematic reviewGinseng and cancer-related fatigue — systematic review of clinical trialsView study →}.

Gap: effect sizes are small-to-moderate, outcome scales are heterogeneous, and part of the positive evidence comes from American rather than Asian ginseng.

3. Erectile dysfunction

A 2022 Cochrane systematic review of nine placebo-controlled RCTs concluded that ginseng has only a trivial effect on erectile function by the IIEF-15 instrument (mean difference 3.52) and rated the certainty of evidence as low ^{8Reference 8Lee et al. · 2022Systematic reviewGinseng for erectile dysfunction — a Cochrane systematic reviewView study →}. An earlier meta-analysis of seven RCTs of Korean Red Ginseng was more favourable, reporting a significant benefit (risk ratio 2.40) but noting uniformly low methodological quality ^{9Reference 9Jang et al. · 2008Systematic reviewRed ginseng for treating erectile dysfunction — systematic reviewView study →}. The often-cited early trial found an overall efficacy of 60% with Korean Red Ginseng versus 30% with placebo or trazodone, with improvements in rigidity, girth and libido ^{10Reference 10Choi et al. · 1995RCTClinical efficacy of Korean red ginseng for erectile dysfunction — randomised controlled trialView study →}. The direction of effect is consistent; the magnitude and certainty are not.

Gap: trials are small, short, mostly from a single region, and methodologically weak; the pooled effect may not be clinically meaningful.

4. Cognition & memory

The cognitive picture is split by domain. A 2024 meta-analysis of 15 RCTs (671 participants) found ginseng significantly improved memory (standardised mean difference 0.19, larger at high doses) but had no significant effect on global cognition, attention or executive function ^{11Reference 11Wang et al. · 2024Meta-analysisEffects of ginseng on cognitive function — systematic review and meta-analysis of RCTsView study →}. The 2010 Cochrane review found no convincing evidence of benefit in healthy adults or people with impairment, citing poor study quality ^{12Reference 12Geng et al. · 2010Systematic reviewGinseng for cognition — Cochrane systematic reviewView study →}, and a 2025 meta-analysis restricted to MMSE and ADAS-cog outcomes in memory-impaired populations reported limited effects ^{13Reference 13Kim et al. · 2025Meta-analysisCognitive benefits of ginseng — systematic review and meta-analysis of MMSE and ADAS-cog changesView study →}. In Alzheimer’s disease specifically, meta-analysis found inconsistent results ^{14Reference 14Wang et al. · 2016Meta-analysisGinseng for Alzheimer’s disease — systematic review and meta-analysis of RCTsView study →}, though one 12-week open-label RCT using 4.5 g/day Panax ginseng powder showed improvement on ADAS-cog and MMSE that waned after discontinuation ^{15Reference 15Lee et al. · 2008RCTPanax ginseng enhances cognitive performance in Alzheimer disease — randomised open-label trialView study →}. Some of the sharpest acute cognitive data actually come from American ginseng (Cereboost-type extracts) in healthy young adults ^{16Reference 16Bell et al. · 2022RCTAcute and chronic effects of American ginseng (Cereboost) on mood and cognition in healthy young adults — randomised placebo-controlled trialView study →}.

Gap: benefit appears confined to memory rather than overall cognition, trials are short and heterogeneous, and several positive acute studies used American ginseng.

5. Immune / cold & flu

The best Asian-ginseng immune trial is a randomised, placebo-controlled study of the standardised G115 extract (100 mg for 12 weeks) as an adjuvant to influenza vaccination: influenza and common-cold cases fell to 15 in the ginseng group versus 42 on placebo, with higher antibody titres ^{17Reference 17Scaglione et al. · 1996RCTEfficacy and safety of the standardised ginseng extract G115 for potentiating influenza vaccination — randomised placebo-controlled trialView study →}. Much of the wider “ginseng prevents colds” literature, however, is based on North American ginseng (Panax quinquefolius): a 4-month RCT of a poly-furanosyl-pyranosyl-saccharide-rich extract reduced the number of verified colds ^{18Reference 18Predy et al. · 2005RCTEfficacy of a North American ginseng extract for preventing upper respiratory tract infections — randomised controlled trialView study →}. Earlier work described immunomodulatory effects of Panax ginseng extracts on immune-cell activity ^{19Reference 19Scaglione et al. · 1990Immunomodulatory effects of two extracts of Panax ginseng C.AView study →}.

Gap: the strongest cold-prevention evidence is for American, not Asian, ginseng; the Asian-ginseng data centre on a single vaccination-adjuvant trial.

6. Cancer chemoprevention

Ginseng’s cancer-prevention signal comes almost entirely from Korean observational epidemiology. A prospective cohort in a ginseng-cultivation area found lower non-organ-specific cancer risk among regular users ^{20Reference 20Yun et al. · 1998ObservationalNon-organ-specific cancer prevention of ginseng — prospective cohort study in KoreaView study →}, supported by nested case-control analyses reporting odds ratios around 0.5 ^{21Reference 21Yun · 2001ObservationalEpidemiological study on cancer prevention by ginsengView study →}. The Kangwha cohort found significantly lower all-cause mortality among male ginseng users (hazard ratio 0.90) but not among women ^{22Reference 22Yi et al. · 2009ObservationalAssociation between ginseng intake and mortality — Kangwha cohort studyView study →}, and a recent Korean multi-centre cohort examined ginseng tea and liver-cancer risk ^{23Reference 23Cho et al. · 2026ObservationalGinseng tea consumption and liver cancer risk — prospective Korean multi-centre cancer cohort studyView study →}. These are consistent but observational: residual confounding (diet, socioeconomic status, health-seeking behaviour) cannot be excluded, and there are no chemoprevention RCTs.

Gap: entirely observational and geographically concentrated; no randomised evidence and plausible confounding.

7. Cardiovascular risk factors

On blood pressure, the pooled evidence is reassuringly neutral rather than beneficial: a meta-analysis of 17 RCTs (n=1381) found no significant effect on systolic, diastolic or mean arterial pressure, with a non-significant trend toward improvement in dysmetabolic subgroups — importantly countering the old concern that ginseng raises blood pressure ^{24Reference 24Komishon et al. · 2016Meta-analysisThe effect of ginseng (genus Panax) on blood pressure — systematic review and meta-analysis of RCTsView study →}. Where ginseng does move markers is inflammation and vascular function: a 2025 dose-response meta-analysis of 70 studies reported reduced high-sensitivity CRP ^{25Reference 252025Meta-analysisThe effect of ginseng supplementation on CVD risk factors — systematic review and dose-response meta-analysisView study →}, a 2024 meta-analysis found favourable shifts in several cardiovascular biomarkers ^{26Reference 262024Meta-analysisEffects of ginseng consumption on cardiovascular health biomarkers in adults — systematic review and meta-analysis of RCTsView study →}, and a Korean Red Ginseng RCT improved arterial stiffness in hypertensive subjects ^{27Reference 27Rhee et al. · 2011RCTEffect of Korean red ginseng on arterial stiffness in subjects with hypertension — randomised controlled trialView study →}. Lipid effects are inconsistent — one meta-analysis found modest improvement ^{28Reference 28Hernández-García et al. · 2019Meta-analysisEfficacy of Panax ginseng supplementation on blood lipid profile — meta-analysis and systematic review of RCTsView study →} while another found no significant change in total cholesterol, triglycerides, LDL or HDL ^{29Reference 29Ziaei et al. · 2020Meta-analysisThe efficacy of ginseng supplementation on plasma lipid concentration in adults — systematic review and meta-analysisView study →}.

Gap: blood-pressure and lipid effects are neutral-to-null overall; the positive signals are on surrogate inflammatory/vascular markers, not hard outcomes.

8. Adaptogenic / stress resistance

The adaptogen concept — that ginseng improves non-specific resistance to stress via the hypothalamic-pituitary-adrenal (HPA) axis — is mechanistically coherent but thinly supported in humans. The direct experimental evidence is largely preclinical, including a comparative animal study of anti-stress effects ^{30Reference 30Rai et al. · 2003AnimalAnti-stress effects of Ginkgo biloba and Panax ginseng — a comparative study (animal model)View study →}. Human data lean on quality-of-life and well-being endpoints that overlap with the fatigue and cognition literature rather than on dedicated stress-response trials.

Gap: the HPA-axis mechanism is demonstrated mainly in animals; robust human trials with physiological stress endpoints are lacking.

9. Menopausal symptoms

Evidence here is limited and mixed. A systematic review of double-blind RCTs found no consistent effect of Korean Red Ginseng on hot-flash frequency, with only isolated positive findings ^{31Reference 31Lee et al. · 2016Systematic reviewGinseng for managing menopausal woman’s health — systematic review of double-blind, randomised, placebo-controlled trialsView study →}. A small RCT (500 mg twice daily, 4 weeks) reported improved Female Sexual Function Index scores in postmenopausal women with sexual dysfunction ^{32Reference 32Ghorbani et al. · 2019RCTThe effect of ginseng on sexual dysfunction in menopausal women — double-blind randomised controlled trialView study →}, but another RCT in genitourinary syndrome of menopause found no significant difference from placebo on objective measures such as vaginal maturation index and pH ^{33Reference 33Yousefi et al. · 2021RCTThe effect of Panax ginseng on genitourinary syndrome in postmenopausal women — randomised, double-blind, placebo-controlled trialView study →}.

Gap: trials are few, small and short; subjective sexual-function endpoints improve while objective urogenital measures do not.

Mechanisms

Mechanism	Drives	Key compounds
HPA-axis modulation, corticosterone regulation	adaptogenic, anti-fatigue	ginsenoside Rb1, ginsenoside Rg1
Enhanced insulin secretion & peripheral glucose uptake, ↓ intestinal glucose absorption	glycemic control	ginsenoside Rg1, ginsenoside Rb1
Nitric-oxide–mediated vasodilation of corpus cavernosum	erectile function	ginsenoside Rg1
Cholinergic support, neurotrophic/antioxidant CNS effects	memory	ginsenoside Rg1, ginsenoside Rg3
NK-cell / macrophage activation, cytokine modulation	immune, chemoprevention	polysaccharides, ginsenoside Rg1
↓ hs-CRP and inflammatory cytokines, improved endothelial function	cardiovascular risk factors	ginsenoside Rb1

Clinical trials

Ginseng is very heavily trialled — ClinicalTrials.gov lists 216 studies naming Panax ginseng as an intervention (122 completed, ~31 planned/ongoing, 9 terminated/withdrawn/suspended, and 54 of “unknown” status — mostly older registrations never updated), with no single dominant sponsored programme.

Completed	Planned/ongoing	Terminated/withdrawn	Unknown status	Preclinical
122	~31	9	54	hundreds

Last checked: July 2026.

Phytochemistry

Asian ginseng’s defining components are its triterpene glycosides — the dammarane saponins known as ginsenosides (or panaxosides) ^{40Reference 40Hoffmann · 2003Medical herbalism: The science and practice of herbal medicine}. There are reportedly over 200 ginsenosides and non-saponin constituents in Panax ginseng ^{39Reference 39Bone K · 2013Principles and Practice of Phytotherapy}, but the practical markers are a handful of major ones: the protopanaxatriol-type ginsenoside Rg1 and the protopanaxadiol-type ginsenoside Rb1 and ginsenoside Rd. These sit alongside immunomodulatory polysaccharides and characteristic polyacetylenes. As ginseng ages, total ginsenoside content rises significantly, which is one reason older, naturally harvested roots are generally preferred.

The Rg1:Rb1 ratio is also chemotaxonomically important: Panax ginseng has a high Rg1:Rb1 ratio, whereas American ginseng (Panax quinquefolius) has a low one (Rb1:Rg1 typically >5), so this ratio is used to tell the two species apart ^{45Reference 45So et al. · 2018ReviewRed ginseng monograph}.

The ginsenosides are suggested to become activated by intestinal bacteria through deglycosylation and esterification ^{44Reference 44Hasegawa H · 2004Proof of the mysterious efficacy of ginseng: metabolic activation of ginsenoside — deglycosylation by intestinal bacteria and esterification with fatty acid}.

Protopanaxadiol (Rb1, Rb2, Rc, and Rd) and protopanaxatriol glycosides (Re, Rf, Rg1, and Rg2) are absorbed into blood or lymph and transported to target tissues to become esterified with stearic, oleic, or palmitic fatty acids ^{44Reference 44Hasegawa H · 2004Proof of the mysterious efficacy of ginseng: metabolic activation of ginsenoside — deglycosylation by intestinal bacteria and esterification with fatty acid}.

The ginsenoside content difference between American ginseng (Panax quinquefolium) and Asian ginseng (Panax ginseng) can be seen through a difference in the ginsenoside ratios of Rg1 and Rg2.

Asian ginseng also contains glycans, and a volatile oil ^{40Reference 40Hoffmann · 2003Medical herbalism: The science and practice of herbal medicine}, as well as saponins, polysaccharides, amino acids, glutamine, arginine, and sesquiterpenes.

Panax ginseng inhibits CYP1A2, CYP2A6, CYP2C9, CYP2D6, CYP3A4 and UGT2B15 in vitro (Anderson et al., 2003) — the clinical significance of these interactions is uncertain.

Constituent Summary

Figures are mg/g of dried root for representative Korean Red Ginseng ^{45Reference 45So et al. · 2018ReviewRed ginseng monograph}; ginsenoside content varies widely with age, cultivar, region and processing. † marks Rg1, whose ratio to Rb1 distinguishes P. ginseng (high) from American ginseng (low).

Clinical Applications

The adaptogenic qualities of ginseng are useful for states of convalescence, and chronic fatigue, but should not be used with those who are already overstimulated, or are in the first or second stages of GAS.

The glucose regulating activities of ginseng make it useful for conditions like metabolic syndrome, and both type I and type II diabetes.

Dosage

In research, Asian ginseng is given both as whole dried root and as standardised extracts (notably G115 and Korean Red Ginseng). Because extracts are concentrated to a marker ginsenoside percentage, an mg-level extract dose and a gram-level root dose are not interchangeable — read each row with its preparation.

Indication	Preparation	Dose	Est. dried-herb equivalent	Source
Glycemic control	Ginseng extract / root	median ~3 g/day (range 0.2–20 g/day)	~3 g dried root (root itself used)	1Reference 1Shishtar et al. · 2014Meta-analysisThe effect of ginseng (the genus Panax) on glycemic control — systematic review and meta-analysis of randomised controlled trialsView study →
Type 2 diabetes / prediabetes	Standardised extract	≥2 g/day for clearer effect	~2 g+	2Reference 2Jovanovski et al. · 2022Meta-analysisThe efficacy of ginseng (Panax) on human prediabetes and type 2 diabetes mellitus — systematic review and meta-analysisView study →
Acute glucose / cognition	G115 standardised extract	200–400 mg single dose	~4 g dried root (rough; G115 ≈ 4% ginsenosides)	3Reference 3Reay et al. · 2005RCTSingle doses of Panax ginseng (G115) reduce blood glucose levels and improve cognitive performance during sustained mental activity — RCTView study →
Cognition (Alzheimer’s)	Panax ginseng powder	4.5 g/day, 12 wk	~4.5 g (whole powder used)	15Reference 15Lee et al. · 2008RCTPanax ginseng enhances cognitive performance in Alzheimer disease — randomised open-label trialView study →
Immune / flu vaccination	G115 standardised extract	100 mg/day, 12 wk	~2 g dried root (order-of-magnitude)	17Reference 17Scaglione et al. · 1996RCTEfficacy and safety of the standardised ginseng extract G115 for potentiating influenza vaccination — randomised placebo-controlled trialView study →
Erectile dysfunction	Korean Red Ginseng	~1.8–3 g/day	~1.8–3 g (root used)	9,10Reference 9Jang et al. · 2008Systematic reviewRed ginseng for treating erectile dysfunction — systematic reviewView study →Reference 10Choi et al. · 1995RCTClinical efficacy of Korean red ginseng for erectile dysfunction — randomised controlled trialView study →

Estimates only, not conversion factors or recommendations: dried root is assumed to hold ~1–4% total ginsenosides, while standardised extracts (G115 ≈ 4% ginsenosides) are marker-concentrated, so mg-level extract doses back-convert to gram-level whole root only roughly.

Traditional Dosage

System	Preparation	Dose
Western herbal	1:2 liquid extract	5–40 mL / week (≈ 0.7–5.7 mL/day)
Western herbal	Dried root	0.5–3 g / day
Traditional Chinese Medicine	Decoction (decocted 3+ hours)	1–10 g

Safety

Panax ginseng has a generally favourable safety profile; systematic reviews of adverse effects find that reactions are usually mild and transient (headache, sleep disturbance, gastrointestinal upset), with serious events rare ^{34,35Reference 34Coon et al. · 2002Systematic reviewPanax ginseng — systematic review of adverse effects and drug interactionsView study →Reference 35Shergis et al. · 2011Systematic reviewSystematic review of randomised controlled trials evaluating the efficacy and safety of ginsengView study →}. Because it can be mildly stimulating, it may cause overstimulation, insomnia or nervousness, especially at high doses or combined with caffeine or other stimulants ^{34Reference 34Coon et al. · 2002Systematic reviewPanax ginseng — systematic review of adverse effects and drug interactionsView study →}. Clinically important interactions are documented: ginseng may reduce the anticoagulant effect of warfarin (shown in an RCT of American ginseng, and a reasonable class caution) ^{36Reference 36Yuan et al. · 2004RCTAmerican ginseng reduces warfarin’s effect in healthy patients — randomised controlled trialView study →}, and a case report describes an interaction with the MAO inhibitor phenelzine (headache, tremor, mania) ^{37Reference 37Jones et al. · 1987Interaction of ginseng with phenelzineView study →}. Because ginseng can influence blood glucose, people taking antidiabetic medication should monitor for additive hypoglycemia ^{1,2Reference 1Shishtar et al. · 2014Meta-analysisThe effect of ginseng (the genus Panax) on glycemic control — systematic review and meta-analysis of randomised controlled trialsView study →Reference 2Jovanovski et al. · 2022Meta-analysisThe efficacy of ginseng (Panax) on human prediabetes and type 2 diabetes mellitus — systematic review and meta-analysisView study →}. It also inhibits several CYP450 enzymes in vitro, so caution is warranted with narrow-therapeutic-index drugs. The older blanket caution against use in hypertension is not supported by pooled trial data — meta-analysis found ginseng has a neutral effect on blood pressure ^{24Reference 24Komishon et al. · 2016Meta-analysisThe effect of ginseng (genus Panax) on blood pressure — systematic review and meta-analysis of RCTsView study →} — but people with hypertension should still monitor, as should anyone prone to overstimulation.

Scope of this assessment: interactions with warfarin (RCT, American ginseng), phenelzine (case report) and antidiabetic drugs (additive hypoglycemia) are documented; in-vitro CYP450 inhibition is characterised but its clinical significance is uncertain. Human pregnancy and lactation safety has not been formally studied.

Pregnancy & lactation

Avoid — not established. Human pregnancy safety has not been established, and the reassurance in some traditional texts is not backed by controlled data. A whole-embryo culture study found the major ginsenoside Rb1 was teratogenic to rat embryos at high concentrations during organogenesis ^{38Reference 38Chan et al. · 2003AnimalAn in-vitro study of ginsenoside Rb1-induced teratogenicity using a whole rat embryo culture modelView study →}. Given the absence of human safety data and this preclinical signal, ginseng is best avoided during pregnancy unless directed by a qualified practitioner; lactation safety has likewise not been formally studied.

References

1. Shishtar, E., Sievenpiper, J. L., Djedovic, V., et al. (2014). The effect of ginseng (the genus Panax) on glycemic control — systematic review and meta-analysis of randomised controlled trials. PLoS One. https://pubmed.ncbi.nlm.nih.gov/25265315/
2. Jovanovski, E., et al. (2022). The efficacy of ginseng (Panax) on human prediabetes and type 2 diabetes mellitus — systematic review and meta-analysis. Nutrients. https://pubmed.ncbi.nlm.nih.gov/35745129/
3. Reay, J. L., Kennedy, D. O., & Scholey, A. B. (2005). Single doses of Panax ginseng (G115) reduce blood glucose levels and improve cognitive performance during sustained mental activity — RCT. J Psychopharmacol. https://pubmed.ncbi.nlm.nih.gov/15982990/
4. Arring, N. M., et al. (2018). Ginseng as a treatment for fatigue — systematic review. J Altern Complement Med. https://pubmed.ncbi.nlm.nih.gov/29624410/
5. Bach, H. V., et al. (2016). Efficacy of ginseng supplements on fatigue and physical performance — meta-analysis of RCTs. J Korean Med Sci. https://pubmed.ncbi.nlm.nih.gov/27822924/
6. Zhou, S. J., et al. (2023). Ginseng and ginseng herbal formulas for symptomatic management of fatigue — systematic review and meta-analysis. J Integr Complement Med. https://pubmed.ncbi.nlm.nih.gov/36730693/
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