Herbal Monograph
Asian ginseng
Panax ginseng C.A.Mey.
Araliaceae
Premier adaptogenic tonic for fatigue, cognitive decline, immune support, and...
Overview
Plant Description
Panax ginseng is a slow-growing, shade-loving perennial herbaceous plant reaching 30-80 cm in height. It produces a single stem bearing a whorl of 3-6 palmately compound leaves, each leaf divided into 5 ovate-acuminate, serrate leaflets (3 large and 2 small). The plant develops a characteristic fleshy, aromatic, fusiform or cylindrical taproot, 5-20 cm long and 1-3 cm in diameter, often branched to resemble a human figure (the word 'ginseng' derives from the Chinese 'ren shen,' meaning 'man root'). The root exterior is yellowish-white to pale brown; white ginseng is the peeled, sun-dried root, while red ginseng is produced by steaming the fresh root before drying, which changes the color to a reddish-brown and alters the ginsenoside profile through chemical transformation. Small, inconspicuous greenish-white flowers appear in a single terminal umbel during the fourth year of growth, followed by bright red, kidney-shaped drupes each containing two hemispherical seeds. The plant requires 4-6 years of cultivation before the root reaches harvestable maturity, making it one of the most labor-intensive medicinal crops in the world.
Habitat
Native to the cool, temperate, mountainous forests of northeastern Asia. Naturally found in shaded, moist deciduous and mixed coniferous-deciduous forests at elevations of 200-1,100 meters, typically on well-drained, humus-rich, loamy soils with a slightly acidic pH (5.5-6.0). Wild populations have become extremely rare due to centuries of overharvesting and habitat loss; wild Panax ginseng is critically endangered in most of its historical range. The majority of commercial ginseng is now cultivated under artificial shade structures or forest canopy.
Distribution
Historically distributed across northeastern China (Manchuria), the Korean Peninsula, and the Russian Far East (Primorsky Krai, southern Khabarovsk). Currently cultivated predominantly in South Korea (where it is a major agricultural export), China (primarily Jilin, Liaoning, and Heilongjiang provinces), and to a lesser extent in Japan and Russia. South Korea produces approximately 50-60% of the world's cultivated ginseng supply, with the Geumsan region particularly renowned for quality. Small-scale cultivation also occurs in Canada, the United States, and parts of Europe, though P. quinquefolius is more commonly grown in North America.
Parts Used
Root (Radix Ginseng)
Preferred: Dried root (whole, sliced, or powdered). Red ginseng (steamed and dried) is considered therapeutically superior in Korean and Chinese traditions.
The dried root is the official drug in all pharmacopeias. Both the main root (body) and lateral rootlets are used, though the main root is more highly valued commercially. Root age (4-6 years), processing method (white vs. red), and growing conditions significantly affect the chemical profile and therapeutic properties. The ginsenoside content of the root varies from approximately 2-8% depending on age, origin, season of harvest, and processing method. Red ginseng contains unique transformed ginsenosides (Rg3, Rg5, Rk1) not present in white ginseng.
Root hairs and fine rootlets (Radix Ginseng fibra)
Preferred: Dried, often included in decoctions or powdered for capsules
The fine rootlets (lateral roots and root hairs) contain higher concentrations of certain ginsenosides per unit weight compared to the main root body, particularly protopanaxatriol-type ginsenosides (Rg1, Re). Traditionally considered slightly less potent but are an economical source of ginsenosides. Often included in teas, extracts, and lower-grade products.
Key Constituents
Triterpene saponins (Ginsenosides)
Ginsenosides are the primary pharmacologically active constituents of Panax ginseng and the basis for standardization of commercial extracts (typically 4-7% total ginsenosides by HPLC). Over 150 unique ginsenosides have been identified. The two main structural subtypes -- protopanaxadiol (PPD: Rb1, Rb2, Rc, Rd, Rg3) and protopanaxatriol (PPT: Re, Rf, Rg1, Rg2) -- often exhibit opposing or complementary pharmacological effects: PPD-type ginsenosides tend to be CNS-depressant, sedative, and anti-inflammatory, while PPT-type ginsenosides tend to be CNS-stimulating, nootropic, and hypertensive. This biphasic, dose-dependent activity is a hallmark of ginseng's adaptogenic mechanism. The Rb1:Rg1 ratio, which differs between species and preparations, is considered an important determinant of overall pharmacological effect. Red ginseng processing creates unique transformed ginsenosides (Rg3, Rg5, Rk1) with enhanced biological activity.
Polysaccharides (Ginsenans / Panaxans)
Ginseng polysaccharides contribute significantly to immunomodulating and hypoglycemic effects that are not fully explained by ginsenosides alone. They are water-soluble and well-extracted in decoctions and aqueous extracts. The polysaccharide fraction accounts for a substantial portion of ginseng's immune-enhancing activity, including enhancement of NK cell activity, macrophage activation, and modulation of cytokine production. They also contribute to the blood sugar-regulating effects via improvement of insulin sensitivity and hepatic glucose metabolism.
Polyacetylenes
Polyacetylenes are lipophilic compounds with notable cytotoxic and antitumor activities. While present in relatively low concentrations, they contribute to the anti-cancer research interest in ginseng. They are best extracted by alcohol-based preparations (tinctures) rather than water. Their clinical significance in whole-root preparations at standard doses remains to be fully established.
Peptides and glycopeptides
Peptide constituents are minor but contribute to the overall antioxidant and antimicrobial activity of ginseng preparations. They are of growing research interest but are not currently used as standardization markers.
Other constituents
Minor constituents that contribute to the overall pharmacological profile of the whole root but are not primary drivers of therapeutic activity.
Herbal Actions
Helps the body adapt to stress and restore homeostasis
Panax ginseng is the quintessential adaptogen and the herb for which much of the modern adaptogen research paradigm was developed. Brekhman and Dardymov (1969) at the USSR Academy of Sciences established the adaptogen concept using P. ginseng and Eleutherococcus senticosus as prototypes. Ginseng modulates the hypothalamic-pituitary-adrenal (HPA) axis, normalizing cortisol levels in both hypo- and hyper-cortisol states. Ginsenosides act on multiple molecular targets: they modulate glucocorticoid receptor sensitivity, regulate nitric oxide synthesis, and influence the expression of heat shock proteins (HSP70). Panossian and Wikman (2010) have proposed that adaptogens including ginseng act as stress-mimetics that activate cellular adaptive stress response pathways (including Nrf2 and FOXO transcription factors). Clinical trials consistently demonstrate improvements in fatigue, stress tolerance, and physical endurance. The Commission E approved ginseng as a tonic for invigoration during fatigue, debility, declining work capacity and concentration, and during convalescence.
[1, 2, 9, 19]Modulates and balances immune function
Ginseng modulates both innate and adaptive immune responses through multiple mechanisms. Ginsenosides and polysaccharides enhance NK cell cytotoxicity, stimulate macrophage phagocytosis and nitric oxide production, promote dendritic cell maturation, and modulate T-helper cell balance (Th1/Th2). Scaglione et al. (1996) demonstrated enhanced influenza vaccine antibody titers in ginseng-supplemented elderly subjects. Predy et al. (2005) showed that a standardized P. ginseng extract (CVT-E002/COLD-fX) reduced the frequency and severity of upper respiratory tract infections. The immunomodulating effect is bidirectional: ginseng can stimulate underactive immune responses while moderating excessive inflammation, consistent with its adaptogenic nature.
[2, 12, 13]Enhances cognitive function, memory, and mental performance
Ginseng enhances cognitive function through multiple mechanisms: ginsenoside Rg1 promotes acetylcholine release and cholinergic neurotransmission, enhances hippocampal neurogenesis and synaptic plasticity, and modulates dopaminergic and serotonergic pathways. Reay et al. (2005) and Scholey et al. (2010) demonstrated acute improvements in working memory, attention, and mental arithmetic in healthy young adults following single doses of standardized ginseng extract. Kennedy and Scholey (2003) showed dose-dependent cognitive enhancement using a ginseng-Ginkgo combination. The nootropic effects are most pronounced in states of cognitive fatigue or suboptimal performance. Long-term use has shown benefits in age-related cognitive decline in observational studies.
[2, 7, 8]Strengthens and tones the heart muscle
Ginseng exerts cardioprotective effects through multiple mechanisms: ginsenosides promote endothelial nitric oxide synthesis (vasodilation), exhibit antioxidant protection against ischemia-reperfusion injury, reduce platelet aggregation (ginsenoside Rg2), and modulate cardiac ion channels. Ginsenoside Re improves endothelial function and reduces oxidative stress in the vasculature. Some clinical evidence supports modest blood pressure reduction, improved lipid profiles, and enhanced cardiac output. The cardiovascular effects are considered tonic and normalizing rather than strongly hypotensive or stimulatory.
[2, 4, 10]Prevents or slows oxidative damage to cells
Multiple ginseng constituents exhibit antioxidant activity through both direct radical scavenging and indirect upregulation of endogenous antioxidant enzymes (superoxide dismutase, catalase, glutathione peroxidase). Ginsenosides activate the Nrf2-ARE pathway, enhancing cellular antioxidant defenses. The polysaccharide fraction also demonstrates significant antioxidant activity. Red ginseng shows enhanced antioxidant capacity compared to white ginseng, attributed to Maillard reaction products (including maltol) and transformed ginsenosides formed during steaming.
[2, 9]Reduces inflammation
Ginsenosides inhibit NF-kB activation, reduce pro-inflammatory cytokine production (TNF-alpha, IL-1beta, IL-6), and suppress COX-2 and iNOS expression. Ginsenoside Rb1 and compound K (the major intestinal metabolite) are the most potent anti-inflammatory ginsenosides. The anti-inflammatory activity is secondary to the primary adaptogenic and immune-modulating actions but contributes meaningfully to therapeutic outcomes in chronic inflammatory conditions.
[2, 4]Lowers blood pressure
Ginseng contains ginsenosides that promote endothelial nitric oxide production, resulting in vasodilation. Some clinical studies show modest blood pressure reduction, though results are inconsistent. The WHO monograph notes that ginseng can both raise and lower blood pressure depending on dose, preparation, and the individual's baseline state, consistent with adaptogenic normalization rather than a unidirectional hypotensive effect. At standard doses, the blood pressure effect is mild and generally clinically insignificant in normotensive individuals.
[2]Protects the liver from damage
Ginsenosides and polysaccharides demonstrate hepatoprotective effects in animal models of chemical hepatotoxicity (carbon tetrachloride, acetaminophen, alcohol). Mechanisms include antioxidant protection, reduction of hepatic inflammatory infiltration, and promotion of hepatocyte regeneration. Clinical evidence is limited to small trials, primarily from East Asian literature.
[2, 4]Therapeutic Indications
Endocrine System
Adrenal fatigue and HPA axis dysregulation
Ginseng modulates cortisol secretion and HPA axis responsiveness. Clinical studies demonstrate improvements in subjective fatigue, stress tolerance, and quality of life in subjects with chronic fatigue and stress-related exhaustion. The Commission E approved ginseng for fatigue, debility, and declining work capacity. Kim et al. (2013) found significant improvement in fatigue severity and quality of life in a double-blind RCT of 1-2 g/day Korean red ginseng over 6 weeks in idiopathic chronic fatigue.
[1, 9, 19]Type 2 diabetes mellitus (adjunctive)
Multiple RCTs demonstrate that ginseng reduces fasting blood glucose, postprandial glucose, and HbA1c in type 2 diabetics. Vuksan et al. (2008) demonstrated that Korean red ginseng (2 g rootlets, 3x daily) significantly improved glucose and insulin regulation compared to placebo over 12 weeks. The hypoglycemic effect involves improved insulin sensitivity, enhanced pancreatic beta-cell function, and hepatic glucose metabolism modulation via ginsenosides and polysaccharides (panaxans). Used as adjunctive therapy only, NOT as replacement for conventional diabetes management.
[2, 11]Convalescence and post-illness recovery
Commission E and WHO both approve ginseng as a tonic during convalescence. The warm, tonifying nature of ginseng helps restore vitality, appetite, and immune competence during recovery from illness, surgery, or prolonged stress. Traditional use in this indication spans thousands of years across Chinese, Korean, and Japanese medicine.
[1, 2]Nervous System
Cognitive impairment and mental fatigue
Acute cognitive enhancement demonstrated in multiple RCTs. Scholey et al. (2010) found that Cereboost (American ginseng extract) and other standardized ginseng preparations improved working memory, reaction time, and subjective calmness in healthy young volunteers. Reay et al. (2005) showed 200 mg standardized extract improved mental arithmetic and reduced subjective mental fatigue. Longer-term studies show promise for age-related cognitive decline. The nootropic effect is mediated primarily by ginsenoside Rg1 enhancement of cholinergic neurotransmission and hippocampal neuroplasticity.
[1, 7, 8]Declining concentration and attention
Commission E specifically lists 'declining capacity for work and concentration' as an approved indication. The WHO monograph corroborates this. Clinical evidence supports improvements in sustained attention, mental processing speed, and resistance to cognitive fatigue during demanding tasks.
[1, 2, 7]General debility and neurasthenia
One of the core Commission E approved indications. Ginseng acts as a non-specific tonic for the nervous system, improving subjective energy, motivation, and stress resilience. Traditional and modern usage supports ginseng for states of nervous exhaustion and low vitality.
[1, 2]Immune System
Recurrent upper respiratory tract infections
Predy et al. (2005) demonstrated that a standardized North American ginseng extract (CVT-E002) significantly reduced the number and severity of colds over 4 months. Scaglione et al. (1996) showed enhanced antibody response to influenza vaccination in elderly subjects receiving standardized P. ginseng extract (G115, 100 mg twice daily for 12 weeks). The immune-enhancing effects involve enhanced NK cell activity, macrophage function, and immunoglobulin production.
[12, 13]Immune deficiency and convalescent immunosuppression
Ginseng enhances both innate and adaptive immune responses. Polysaccharide fractions activate macrophages and stimulate cytokine production. Clinical application includes immune support during convalescence, in the elderly with age-related immune decline, and during periods of high stress when immune function is compromised.
[2, 12]Cardiovascular System
Cardiovascular tonic and endothelial support
Ginseng promotes endothelial nitric oxide synthesis, improves arterial compliance, and reduces oxidative stress in the vasculature. Clinical evidence suggests modest improvements in blood pressure, lipid profiles (reduced LDL, improved HDL:LDL ratio), and platelet function. Red ginseng in particular shows benefit for endothelial dysfunction.
[2, 10]Exercise tolerance and physical performance
Widely used to enhance physical stamina and exercise capacity. Some controlled studies show improvements in maximal oxygen uptake (VO2 max) and time to exhaustion, but results across studies are inconsistent. The WHO monograph notes that evidence for ergogenic effects is conflicting, with positive results more common in older or fatigued subjects than in trained athletes at peak performance.
[1, 2]Reproductive System
Erectile dysfunction
Jang et al. (2008) conducted a systematic review and meta-analysis of RCTs examining red ginseng for erectile dysfunction. Six RCTs (n=349 total) showed a significant treatment effect favoring ginseng over placebo. The mechanism involves ginsenoside-mediated enhancement of endothelial nitric oxide release in the corpus cavernosum, facilitating smooth muscle relaxation and vasodilation. Korean red ginseng at doses of 1.4-3 g/day for 8-12 weeks was used across the positive trials.
[10]Male infertility (adjunctive)
Limited clinical evidence suggests ginseng may improve sperm parameters (count, motility, morphology). Animal studies demonstrate ginsenoside effects on spermatogenesis and testosterone levels. Used traditionally as a male reproductive tonic in TCM. Insufficient evidence for standalone treatment; considered adjunctive only.
[2]Menopausal symptoms
Some clinical studies suggest red ginseng may improve menopausal quality of life, including fatigue and psychological well-being, though evidence for hot flash reduction is inconsistent. May provide benefit through adrenal support and HPA axis modulation rather than direct estrogenic activity.
[2]Digestive System
Poor appetite and digestive weakness (spleen qi deficiency pattern)
In TCM, ginseng is a primary herb for tonifying spleen qi, which manifests as poor appetite, fatigue after eating, loose stools, and general digestive weakness. The warm, sweet nature supports digestive function. Western clinical evidence for digestive indications is limited, but traditional use is well-documented across East Asian medical systems.
[2, 16]Energetics
Temperature
warm
Moisture
slightly moist
Taste
Tissue States
cold/depression, dry/atrophy
In traditional Chinese medicine, P. ginseng (Ren Shen) is classified as sweet and slightly bitter in taste, warm in nature, entering the Lung, Spleen, and Heart meridians. It is the premier qi tonic (bu qi yao) and is used to tonify yuan (original) qi, benefit the lungs, strengthen the spleen, promote fluid production, and calm the spirit (shen). Its warm, slightly moist nature makes it most appropriate for cold, deficient constitutions with signs of qi collapse -- fatigue, weak pulse, shortness of breath, cold extremities, poor appetite, and chronic debility. In Western energetic herbalism, ginseng is considered a warming tonic indicated for cold/depression and dry/atrophy tissue states. It is generally NOT indicated for hot, excess, or yin-deficient conditions with heat signs (irritability, insomnia, flushed face, rapid pulse), where the cooler P. quinquefolius (American ginseng) may be more appropriate.
Traditional Uses
Traditional Chinese Medicine (TCM)
- Supreme qi tonic (bu qi yao): tonifies yuan (original) qi for severe qi deficiency with fatigue, weak pulse, shortness of breath, and spontaneous sweating
- Rescues devastated qi in acute collapse (wang yang, wang yin syndromes): used in emergency formulas like Du Shen Tang (Solitary Ginseng Decoction) and Shen Fu Tang (Ginseng and Aconite Decoction)
- Tonifies spleen qi: poor appetite, fatigue, loose stools, abdominal distension, chronic diarrhea
- Benefits lung qi: chronic cough with thin sputum, shortness of breath on exertion, wheezing
- Promotes fluid production (sheng jin): thirst, dry mouth, wasting-thirst disorder (xiao ke, associated with diabetes)
- Calms the spirit (an shen): restlessness, anxiety, insomnia, poor memory due to qi and blood deficiency, palpitations
- Key classical formula: Si Jun Zi Tang (Four Gentlemen Decoction) -- foundational qi tonic formula combining Ren Shen, Bai Zhu (Atractylodes), Fu Ling (Poria), and Zhi Gan Cao (prepared licorice)
"Shen Nong Ben Cao Jing (Divine Farmer's Classic of Materia Medica, c. 200 CE): 'Ren Shen: sweet in taste, slightly cold [note: later authorities reclassified as warm]. It mainly supplements the five zang organs, quiets the spirit, settles the ethereal and corporeal souls, stops fright palpitations, eliminates evil qi, brightens the eyes, opens the heart, and sharpens the wits. Prolonged taking makes the body light and extends the years.' It is listed as a 'superior' herb (shang pin) -- one that can be taken long-term without harm."
Korean Traditional Medicine (Hanbang / Hanguk Uihak)
- Insam (ginseng) is the most revered herb in Korean medicine and a central element of Korean culture and commerce
- Used as a daily health tonic in the form of ginseng tea, ginseng wine (insam-ju), and ginseng-infused honey
- Red ginseng (hong-sam) is considered superior to white for chronic debility, cold constitutions, and immune support
- Prescribed in prescriptions for fatigue, poor digestion, impotence, anxiety, diabetes, and recovery from serious illness
- Key formulas include Gyeongok-go (jade paste), Ssanghwa-tang (double harmony decoction) for post-illness recovery
"Donguibogam (Precious Mirror of Eastern Medicine, Heo Jun, 1613): Extensively discusses ginseng as the king of tonifying herbs. Ginseng is described as supplementing the original qi of the five organs, particularly the lung and spleen."
Western Herbalism (Modern Phytotherapy)
- Adaptogen for chronic stress, adrenal fatigue, and burnout syndromes
- Tonic for the elderly to improve vitality, cognitive function, and immune resilience
- Support during convalescence from serious illness or surgery
- Cognitive enhancer for students and professionals during periods of high mental demand
- Immune support during cold and flu season, particularly in combination with Echinacea or Astragalus
- Male reproductive tonic for declining libido, erectile dysfunction, and infertility
Eclectic and Physiomedicalist Tradition (19th-century American)
- Eclectic physicians used P. quinquefolius (American ginseng) more commonly than P. ginseng due to availability
- Ginseng was recognized as a mild stimulant tonic and demulcent
- King's American Dispensatory (1898) describes it as 'a mild, non-irritating demulcent and a gentle nervous stimulant,' useful in nervous dyspepsia, mental exhaustion, and sexual neurasthenia
- Used in formulas for consumption (tuberculosis), debility, and loss of appetite
"King's American Dispensatory (Felter & Lloyd, 1898): 'Ginseng is a mild, non-irritating tonic, somewhat demulcent, and probably also slightly stimulant to the central nervous system. It is adapted to debilitated conditions of the system, and has been employed in gastric and intestinal debility, loss of appetite, nervous exhaustion, and general languor.'"
[18]
Modern Research
Cognitive function and mental performance
Multiple randomized controlled trials have investigated ginseng's effects on cognitive function in healthy volunteers. Scholey et al. (2010) demonstrated acute improvements in working memory accuracy, subjective calmness, and cognitive performance following 200 mg of a standardized Cereboost extract. Reay et al. (2005) showed that 200 mg of standardized ginseng extract (G115) improved mental arithmetic performance and reduced subjective mental fatigue during a sustained cognitive demand battery. Kennedy et al. (2001) found dose-dependent improvements in speed of attention and memory quality. Effects are most pronounced during cognitively demanding tasks and under conditions of fatigue.
Findings: Acute administration of standardized ginseng extract (200-400 mg) significantly improved working memory, serial subtraction accuracy, speed of attention processing, and subjective mental energy compared to placebo in healthy young adults. Effects were observable within 1-6 hours of administration.
Limitations: Most acute cognitive studies are single-dose, crossover designs with relatively small sample sizes (20-60 participants). Long-term cognitive benefits are less well-established in healthy young populations. Variability in ginseng products and standardization makes cross-study comparison difficult. Few studies in cognitively impaired populations.
Fatigue and physical performance
Kim et al. (2013) conducted a double-blind, placebo-controlled RCT evaluating Korean red ginseng for idiopathic chronic fatigue. Patients receiving 1-2 g/day of red ginseng for 4 weeks showed significant improvement in mental and physical fatigue scores (Chalder Fatigue Scale) and visual analog fatigue scores compared to placebo. Oxidative stress markers (reactive oxygen species, malondialdehyde) were also reduced. However, evidence for ergogenic effects in trained athletes is inconsistent: some studies show improved VO2max and endurance, while others show no significant benefit in well-conditioned athletes.
Findings: Korean red ginseng (1-2 g/day, 4 weeks) significantly reduced fatigue severity scores and oxidative stress markers in idiopathic chronic fatigue patients compared to placebo (p<0.05). Improvements were observed in both physical and mental fatigue subscales.
Limitations: The chronic fatigue study had a moderate sample size (n=90). Ergogenic studies in athletes have produced mixed results, suggesting ginseng's anti-fatigue effect may be most relevant in debilitated rather than optimally healthy individuals. Optimal dose and duration for anti-fatigue effects are not definitively established.
[9]
Immune function and respiratory infection prevention
Scaglione et al. (1996) demonstrated that 100 mg of standardized P. ginseng extract (G115) twice daily for 12 weeks before influenza vaccination significantly enhanced antibody titers and NK cell activity in elderly subjects (n=227) compared to placebo. Predy et al. (2005) conducted a large RCT (n=323) with a North American ginseng extract (CVT-E002, COLD-fX) showing significant reduction in the number of self-reported colds, total symptom days, and symptom severity over a 4-month cold season compared to placebo. The mechanism involves enhancement of innate immune parameters including NK cell activity, macrophage phagocytosis, and interferons.
Findings: Standardized ginseng extract enhanced influenza vaccine antibody response (anti-HA titers 4-fold increase in ginseng vs. 2-fold in placebo group) and NK cell activity in elderly subjects. In a separate trial, ginseng extract reduced mean number of colds by 25% and total symptom days by 55% compared to placebo.
Limitations: The Scaglione trial used a specific standardized extract (G115) and results may not generalize to all ginseng products. The Predy trial used CVT-E002 derived from P. quinquefolius, not P. ginseng, though the polysaccharide-driven immune mechanism is shared. Blinding concerns exist in some studies due to ginseng's distinctive taste. Larger confirmatory trials would strengthen the evidence base.
Erectile dysfunction
Jang et al. (2008) published a systematic review and meta-analysis of six RCTs (n=349 total) evaluating red ginseng for erectile dysfunction. The pooled analysis demonstrated a significantly greater improvement in International Index of Erectile Function (IIEF) scores with red ginseng compared to placebo. Individual trials used Korean red ginseng at doses of 1.4-3 g/day for 8-12 weeks. The proposed mechanism involves ginsenoside-mediated enhancement of nitric oxide synthesis in the corpus cavernosum endothelium and smooth muscle, facilitating vasodilation and penile engorgement.
Findings: Meta-analysis of 6 RCTs showed a significant pooled effect of red ginseng over placebo for erectile dysfunction (weighted mean difference in IIEF score: 5.0 points, p<0.00001). Treatment effects were clinically meaningful, with improvements in erectile function, orgasmic function, and overall satisfaction domains.
Limitations: Included trials had relatively small individual sample sizes (28-86 per study). Methodological quality was variable, with some studies lacking rigorous blinding or allocation concealment. All positive trials used Korean red ginseng; efficacy of white ginseng for this indication is unconfirmed. Effect size, while statistically significant, is modest compared to PDE5 inhibitors.
[10]
Blood glucose regulation in type 2 diabetes
Vuksan et al. (2008) conducted a double-blind, placebo-controlled, crossover RCT evaluating Korean red ginseng rootlets (2 g, 3 times daily) in 19 well-controlled type 2 diabetics over 12 weeks. Ginseng treatment significantly improved glucose and insulin regulation: fasting glucose was reduced by 8%, HOMA-IR (insulin resistance index) improved, and 75-g oral glucose tolerance test (OGTT) glucose and insulin AUC were significantly reduced. The mechanism involves improvement in insulin sensitivity and possibly enhanced pancreatic beta-cell function mediated by ginsenosides and polysaccharides (panaxans).
Findings: Korean red ginseng (6 g/day rootlets, 12 weeks) significantly reduced fasting plasma glucose by 0.71 mmol/L (p=0.018), improved insulin sensitivity (HOMA-IR, p=0.006), and maintained HbA1c in well-controlled type 2 diabetics. Safety profile was good with no episodes of hypoglycemia.
Limitations: Small sample size (n=19) and short treatment duration (12 weeks). Participants had well-controlled diabetes (mean HbA1c 6.5%); effects in poorly controlled diabetes are unknown. Crossover design may be influenced by carryover effects. Used ginseng rootlets rather than main root; generalizability to other preparations is uncertain.
[11]
Anti-cancer research
A large prospective cohort study by Yun and Choi (1998) following 4,634 Korean adults for 5 years found a significant dose-dependent reduction in cancer risk associated with ginseng intake (OR 0.56 for ginseng users vs. non-users, with the strongest protection for gastric and lung cancers). However, this was an observational study and cannot establish causation. In vitro and in vivo research has identified multiple anti-cancer mechanisms: ginsenoside Rg3 inhibits tumor angiogenesis and metastasis, ginsenoside Rh2 induces apoptosis, and compound K modulates cell cycle arrest. Polyacetylenes (panaxydol, panaxynol) are directly cytotoxic to multiple cancer cell lines. Despite promising preclinical data, definitive clinical trial evidence for ginseng as a cancer treatment or preventive agent is still lacking.
Findings: Prospective cohort study showed a significant inverse association between ginseng consumption and overall cancer risk (OR 0.56, 95% CI 0.37-0.85), with dose-response relationship. Red ginseng and ginseng extract showed stronger protective associations than fresh ginseng or white ginseng. Gastric and lung cancers showed the strongest protective effect.
Limitations: Observational design cannot establish causation. Confounding factors (healthy user bias, lifestyle differences between ginseng users and non-users in Korean culture) are difficult to fully control. No large-scale randomized cancer prevention trials have been completed. In vitro anti-cancer concentrations of ginsenosides may exceed achievable plasma levels with oral dosing.
[15]
Safety and adverse effects (systematic review)
Seely et al. (2008) conducted a systematic review of adverse events associated with Panax ginseng in 57 RCTs and systematic reviews. The most commonly reported adverse effects were headache, sleep disturbances, and gastrointestinal symptoms, all at rates comparable to placebo. The review concluded that P. ginseng appears generally safe at recommended doses for up to 6 months of use. The concept of 'ginseng abuse syndrome' (hypertension, nervousness, insomnia, diarrhea) proposed by Siegel (1979) has been largely discredited as methodologically flawed and confounded by concurrent stimulant use.
Findings: Across 57 RCTs, adverse event rates with P. ginseng were not significantly different from placebo for most outcomes. No serious adverse events were attributed to ginseng at standard doses. The most common side effects (headache, GI disturbance, sleep disturbance) occurred at rates of 3-15%, comparable to placebo groups.
Limitations: Many included trials had suboptimal adverse event reporting. Long-term safety data beyond 6 months is limited. Product quality and standardization varied across trials. Most trials excluded patients on anticoagulants, immunosuppressants, or insulin, so interaction safety data from trials is limited.
[14]
Preparations & Dosage
Decoction
Strength: Dried root, typically 3-9 g per decoction. Root should be at least 4 years old (6-year roots preferred for potency).
Slice 3-9 g of dried ginseng root. Add to 400-500 mL of cold water in a non-metallic pot (ceramic, glass, or enamel). Bring to a gentle boil, reduce heat, and simmer covered for 30-60 minutes until the liquid is reduced by approximately half. In TCM practice, ginseng is traditionally decocted separately from other herbs in a formula (ling jian, 'separately decocted') to avoid loss of volatile constituents and to ensure full extraction. The decoction can be re-simmered with the same root material for a second extraction. Strain and drink warm.
3-9 g dried root per day as decoction (TCM standard dosing). In acute debility or qi collapse: up to 15-30 g as a single rescue dose (Du Shen Tang tradition). Standard daily use: 3-6 g.
1-2 times daily, typically morning and early afternoon. Avoid evening dosing due to potential stimulatory effect disrupting sleep.
Traditional TCM use allows for extended courses (2-3 months) followed by a rest period. Commission E does not specify a maximum duration but recommends up to 3 months of use. Continuous use beyond 3 months should be monitored by a qualified practitioner.
Not generally recommended for children under 12 years. If prescribed by a qualified practitioner: 1-3 g/day in children over 6 years.
Decoction is the traditional TCM preparation method and extracts both ginsenosides and water-soluble polysaccharides effectively. The extended simmering time is important for full extraction from the dense root material. In Chinese pharmacy, high-quality roots may be separately decocted and the liquid added to a pre-made formula. The spent root material is sometimes chewed and eaten after decocting. Red ginseng (hong shen) and white ginseng (bai shen) may be prepared this way, with red ginseng considered more potent and warming.
Tincture
Strength: 1:5 in 50-60% ethanol (standard). Some practitioners use 1:2 or 1:3 for more concentrated preparations.
Prepare using dried ginseng root in 50-60% ethanol. Macerate finely sliced or coarsely powdered root in alcohol for 4-6 weeks, shaking regularly. Strain and press. Alcohol extraction captures ginsenosides and polyacetylenes effectively but extracts polysaccharides less efficiently than water-based preparations.
1-3 mL (20-60 drops) of 1:5 tincture, 2-3 times daily. For stronger preparations (1:2 or 1:3), reduce volume accordingly.
2-3 times daily, taken with water. Morning and midday dosing preferred.
Up to 3 months continuous use, then reassess.
Not recommended for children under 12.
Tincture is a convenient Western preparation form. Alcohol effectively extracts ginsenosides (the primary active saponins) and lipophilic polyacetylenes. However, the immunomodulating polysaccharides are less efficiently extracted by alcohol than by water. For a full-spectrum preparation, some herbalists combine tincture with a water-based decoction. The BHP (British Herbal Pharmacopoeia) recommends a 1:5 tincture in 60% ethanol.
Standardized Extract
Strength: Standardized to contain 4-7% total ginsenosides (Rb1, Rb2, Rc, Rd, Re, Rf, Rg1) as measured by HPLC. G115 extract is standardized to 4% ginsenosides. Korean government standard for red ginseng extract: minimum 70 mg/g ginsenosides Rg1+Rb1+Rg3.
Commercial standardized extracts are the most widely studied form in clinical trials. The most commonly used standardized extract is G115 (Ginsana/Pharmaton), standardized to 4% total ginsenosides by HPLC. Other standardized products include GS-KG9 (Korean red ginseng extract). Take with water, typically with meals.
100-400 mg standardized extract (4-7% ginsenosides) daily. The most commonly studied dose is 200 mg G115 twice daily. For Korean red ginseng extract: 300-600 mg daily. WHO recommends 0.5-2 g dried root equivalent daily.
1-2 times daily, morning and/or midday
Up to 3 months continuous use. Most clinical trials have used 4-12 week treatment courses.
Not recommended for children under 12.
Standardized extracts provide the most consistent and reproducible dosing and are the preparation form used in the majority of clinical trials. The ginsenoside profile should specify both PPD-type and PPT-type saponins. Products standardized only to 'total saponins' by colorimetric assay (rather than individual ginsenosides by HPLC) may have less reliable potency. Authentication and quality control are critical: ginseng is one of the most commonly adulterated herbal products worldwide. Adulteration with cheaper species (Eleutherococcus, Pfaffia paniculata/Brazilian ginseng) or addition of caffeine has been documented.
Capsule / Powder
Strength: Crude dried root powder, typically 500 mg per capsule. Ginsenoside content varies significantly by root source and quality (2-8% of dry weight).
Dried ginseng root, powdered and encapsulated. Use whole root powder or red ginseng powder. Capsules offer convenience and avoid the characteristic bitter taste that some find unpalatable.
500-2000 mg dried root powder daily in divided doses (2-4 capsules of 500 mg). WHO recommended dosage: 0.5-2 g dried root per day.
2-3 times daily with meals. Morning and midday preferred.
Up to 3 months continuous use.
Not recommended for children under 12.
Powdered root capsules provide the full spectrum of ginseng constituents (ginsenosides, polysaccharides, polyacetylenes) but with variable ginsenoside content depending on root quality, age, and processing. Less standardized than commercial extracts. Quality varies widely between manufacturers. Look for products with third-party verification of ginsenoside content and absence of contaminants (heavy metals, pesticides, microbial contamination).
Infusion (Tea)
Strength: 1-3 g dried root per 200-250 mL water.
Thinly slice 1-3 g of dried ginseng root. Place in a cup or teapot and add 200-250 mL of freshly boiled water (95-100 degrees C). Cover and steep for 10-15 minutes. The slices can be re-steeped 2-3 times, as ginsenosides continue to extract with subsequent infusions. In Korean tradition, sliced red ginseng is steeped and the softened slices are chewed and consumed along with the liquid.
1-3 g dried root as infusion, 1-3 times daily.
1-3 times daily, preferably morning and early afternoon.
May be used long-term as a tonic tea. Courses of 2-3 months with breaks are traditional.
Not recommended for children under 12.
Simple infusion is a gentle preparation that extracts water-soluble ginsenosides and polysaccharides. Less potent than decoction (shorter extraction time) but adequate for general tonic use. Commercially available ginseng tea bags typically contain 1-3 g of root material and may include added sweeteners. Fresh ginseng root can also be thinly sliced and steeped. Decoction (longer simmering) is preferred when stronger therapeutic effect is needed.
[2]
Glycerite
Strength: 1:5 in 60% glycerin / 40% water.
Prepare using dried ginseng root in a vegetable glycerin and water mixture (typically 60:40 glycerin:water). Macerate finely cut root material for 4-6 weeks, shaking daily. Strain and press. Glycerites offer an alcohol-free alternative for patients who cannot tolerate ethanol-based tinctures.
2-5 mL, 2-3 times daily.
2-3 times daily
Up to 3 months continuous use.
For children over 6 years (under practitioner guidance): 1-2 mL, 1-2 times daily.
Glycerites are a useful alcohol-free alternative but are generally less efficient at extracting ginsenosides than alcohol-based tinctures. The sweet taste of glycerin can help mask ginseng's bitterness. Suitable for patients who avoid alcohol for medical, religious, or personal reasons. Shelf life is shorter than tinctures (typically 1-2 years vs. 3-5 years).
[4]
Safety & Interactions
Class 2d
Other specific use restrictions apply (AHPA Botanical Safety Handbook)
Contraindications
AHPA Class 2d: not to be used during pregnancy. Ginsenoside Rg1 has been shown to have embryotoxic effects in rat embryo culture at high concentrations. While epidemiological evidence of teratogenicity in humans is absent, the lack of adequate safety data in pregnant women and the traditional TCM caution against using ginseng during pregnancy (it is considered too warming and stimulating for the fetus) warrant avoidance. Some TCM practitioners allow ginseng in specific formulas during late pregnancy under careful supervision, but general supplemental use is contraindicated.
In TCM, ginseng is contraindicated in excess heat conditions (shi re) and during acute febrile illness. Its warm, tonifying nature may exacerbate fever, inflammation, and infection. Traditional texts state: 'Do not tonify in the presence of excess.' This is a fundamental principle of TCM tonic herb prescribing. During acute infection, the immune-stimulating properties may also theoretically worsen inflammation.
Although ginseng's effect on blood pressure is generally mild and bidirectional, case reports and traditional concerns suggest that ginseng may occasionally elevate blood pressure in some individuals, particularly at high doses or in those with pre-existing uncontrolled hypertension. The WHO monograph recommends caution. Most clinical evidence suggests ginseng does not significantly increase blood pressure at standard doses, and some studies show modest hypotensive effects. However, prudent monitoring is warranted in hypertensive patients.
Drug Interactions
| Drug / Class | Severity | Mechanism |
|---|---|---|
| Warfarin and coumarin anticoagulants (Anticoagulants) | moderate | Case reports describe decreased INR in patients taking warfarin and ginseng concurrently. Proposed mechanisms include: (1) ginseng may induce CYP enzymes involved in warfarin metabolism, (2) ginsenosides may have weak procoagulant properties via platelet activation or thromboxane A2 formation that partially offset warfarin's effect. A pharmacokinetic study by Jiang et al. (2004) found that American ginseng (P. quinquefolius) reduced warfarin AUC and INR in healthy volunteers. However, the interaction data is primarily from case reports and a single PK study, and clinical significance in routine practice is debated. |
| Monoamine oxidase inhibitors (MAOIs: phenelzine, tranylcypromine, selegiline) (MAOIs) | theoretical | A single case report described headache, insomnia, and tremor in a patient combining ginseng with phenelzine. Theoretical mechanism: ginseng may have mild monoamine reuptake inhibitory properties or may potentiate catecholaminergic effects. However, no pharmacological mechanism for a true MAOI interaction has been established, and the case report may reflect coincidental adverse effects or ginseng's intrinsic stimulatory properties. |
| Insulin and oral hypoglycemic agents (metformin, sulfonylureas, thiazolidinediones) (Antidiabetic agents) | moderate | Ginseng has demonstrated hypoglycemic effects in clinical trials (Vuksan et al. 2008). Combining ginseng with antidiabetic medications may produce additive glucose-lowering effects. The mechanism involves ginseng-mediated improvement in insulin sensitivity, enhanced insulin secretion, and altered hepatic glucose metabolism. Both ginsenosides and polysaccharides contribute to the hypoglycemic effect. |
| Immunosuppressants (cyclosporine, tacrolimus, azathioprine, mycophenolate) (Immunosuppressants) | theoretical | Ginseng has documented immunostimulating properties (enhanced NK cell activity, macrophage activation, cytokine production). These effects could theoretically counteract the immunosuppressive effects of drugs used in organ transplant recipients or autoimmune disease. No clinical case reports of graft rejection or autoimmune flare attributable to ginseng have been published, but the theoretical concern is pharmacologically plausible. |
| Stimulant medications and caffeine (CNS stimulants) | minor | Additive stimulatory effects. Ginseng has mild CNS-stimulating properties (particularly PPT-type ginsenosides like Rg1). Combining with caffeine, amphetamines, or other stimulants may increase the risk of insomnia, nervousness, tachycardia, and elevated blood pressure. |
| Antiplatelet agents (aspirin, clopidogrel) (Antiplatelet agents) | theoretical | Some ginsenosides (particularly Rg2 and panaxynol) inhibit platelet aggregation in vitro. Theoretical additive antiplatelet effect when combined with pharmaceutical antiplatelet agents. However, clinical bleeding events attributable to this interaction have not been reported. |
Pregnancy & Lactation
Pregnancy
possibly unsafe
Lactation
insufficient data
AHPA Class 2d: not to be used during pregnancy. Ginsenoside Rg1 demonstrated embryotoxic effects in rat whole embryo culture at concentrations achievable with high-dose supplementation. No human epidemiological studies have confirmed teratogenicity, but the absence of adequate safety data in pregnant women, combined with ginseng's stimulating and warming properties, supports a precautionary avoidance during pregnancy. The WHO monograph advises against use during pregnancy. Regarding lactation, insufficient data exists: ginseng has not been shown to be harmful during breastfeeding, but safety has not been systematically studied. Some TCM practitioners consider ginseng compatible with breastfeeding when indicated for postpartum qi deficiency, but this should only be under qualified supervision.
Adverse Effects
References
Monograph Sources
- [1] German Commission E (Bundesinstitut fur Arzneimittel und Medizinprodukte). Commission E Monograph: Ginseng radix (Ginseng Root) -- Positive. Bundesanzeiger (Federal Gazette), No. 11 (1991)
- [2] World Health Organization. WHO Monographs on Selected Medicinal Plants, Volume 1: Radix Ginseng. World Health Organization, Geneva (1999) : 168-182
- [3] Blumenthal M, Goldberg A, Brinckmann J (eds). Herbal Medicine: Expanded Commission E Monographs. American Botanical Council, Austin, TX; Integrative Medicine Communications, Newton, MA (2000) . ISBN: 978-0967077215
- [4] Hoffmann D. Medical Herbalism: The Science and Practice of Herbal Medicine. Healing Arts Press, Rochester, VT (2003) . ISBN: 978-0892817498
- [5] Mills S, Bone K. Principles and Practice of Phytotherapy: Modern Herbal Medicine. Churchill Livingstone, Edinburgh (2000) . ISBN: 978-0443060168
- [6] Gardner Z, McGuffin M (eds). American Herbal Products Association's Botanical Safety Handbook, 2nd Edition. CRC Press, Boca Raton, FL (2013) . ISBN: 978-1466516946
Clinical Studies
- [7] Scholey A, Ossoukhova A, Owen L, Ibarra A, Pipingas A, He K, Roller M, Stough C. Effects of American ginseng (Panax quinquefolius) on neurocognitive function: an acute, randomised, double-blind, placebo-controlled, crossover study. Psychopharmacology (Berl) (2010) ; 212 : 345-356 . DOI: 10.1007/s00213-010-1964-y . PMID: 20676609
- [8] Reay JL, Kennedy DO, Scholey AB. Single doses of Panax ginseng (G115) reduce blood glucose levels and improve cognitive performance during sustained mental activity. J Psychopharmacol (2005) ; 19 : 357-365 . DOI: 10.1177/0269881105053286 . PMID: 15982990
- [9] Kim HG, Cho JH, Yoo SR, Lee JS, Han JM, Lee NH, Ahn YC, Son CG. Antifatigue effects of Panax ginseng C.A. Meyer: a randomised, double-blind, placebo-controlled trial. PLoS One (2013) ; 8 : e61271 . DOI: 10.1371/journal.pone.0061271 . PMID: 23613825
- [10] Jang DJ, Lee MS, Shin BC, Lee YC, Ernst E. Red ginseng for treating erectile dysfunction: a systematic review. Br J Clin Pharmacol (2008) ; 66 : 444-450 . DOI: 10.1111/j.1365-2125.2008.03236.x . PMID: 18754850
- [11] Vuksan V, Sung MK, Sievenpiper JL, Stavro PM, Jenkins AL, Di Buono M, Lee KS, Leiter LA, Nam KY, Arnason JT, Choi M, Naeem A. Korean red ginseng (Panax ginseng) improves glucose and insulin regulation in well-controlled, type 2 diabetes: results of a randomized, double-blind, placebo-controlled study of efficacy and safety. Nutr Metab Cardiovasc Dis (2008) ; 18 : 46-56 . DOI: 10.1016/j.numecd.2006.04.003 . PMID: 16860976
- [12] Scaglione F, Cattaneo G, Alessandria M, Cogo R. Efficacy and safety of the standardised Ginseng extract G115 for potentiating vaccination against the influenza syndrome and protection against the common cold. Drugs Exp Clin Res (1996) ; 22 : 65-72 . PMID: 8879982
- [13] Predy GN, Goel V, Lovlin R, Donner A, Stitt L, Basu TK. Efficacy of an extract of North American ginseng containing poly-furanosyl-pyranosyl-saccharides for preventing upper respiratory tract infections: a randomized controlled trial. CMAJ (2005) ; 173 : 1043-1048 . DOI: 10.1503/cmaj.1041470 . PMID: 16247099
- [14] Seely D, Dugoua JJ, Perri D, Mills E, Koren G. Safety and efficacy of Panax ginseng during pregnancy and lactation. Can J Clin Pharmacol (2008) ; 15 : e87-e94 . PMID: 18204101
- [15] Yun TK, Choi SY. Preventive effect of ginseng intake against various human cancers: a case-control study on 1987 pairs. Cancer Epidemiol Biomarkers Prev (1995) ; 4 : 401-408 . PMID: 7655336
Traditional Texts
- [16] Bensky D, Clavey S, Stoger E. Chinese Herbal Medicine: Materia Medica, 3rd Edition. Eastland Press, Seattle, WA (2004) . ISBN: 978-0939616428
- [17] Chen JK, Chen TT. Chinese Medical Herbology and Pharmacology. Art of Medicine Press, City of Industry, CA (2004) . ISBN: 978-0974063508
- [18] Felter HW, Lloyd JU. King's American Dispensatory, 18th Edition. Ohio Valley Company, Cincinnati, OH (1898)
- [19] Panossian A, Wikman G. Effects of adaptogens on the central nervous system and the molecular mechanisms associated with their stress-protective activity. Pharmaceuticals (2010) ; 3 : 188-224 . DOI: 10.3390/ph3010188
Pharmacopeias & Reviews
- [20] European Directorate for the Quality of Medicines. European Pharmacopoeia, 10th Edition: Ginseng radix (Ginseng Root). Council of Europe, Strasbourg (2020)
- [21] United States Pharmacopeial Convention. USP Herbal Medicines Compendium: Panax ginseng Root. United States Pharmacopeia, Rockville, MD (2020)
Last updated: 2026-03-01 | Status: published
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