Herbal Monograph
Reishi
Ganoderma lucidum (Curtis) P. Karst.
Ganodermataceae (Polyporales)
Revered adaptogenic mushroom for immune modulation, calm sleep, and resilient...
Overview
Plant Description
Reishi is a wood-decaying basidiomycete fungus that produces annual or perennial bracket-shaped fruiting bodies (basidiocarps) on hardwood trees and stumps. The fruiting body features a distinctive kidney-shaped to fan-shaped cap (pileus), typically 5-25 cm (2-10 inches) in diameter and 1-3 cm thick, with a characteristic glossy, lacquered or varnished surface (cuticle) that gives it a polished, shellac-like appearance. The cap surface displays concentric growth zones and ranges in color from reddish-brown to dark mahogany, sometimes with yellowish-white margins on actively growing specimens. The undersurface (hymenium) bears a dense layer of minute pores (tubes) that are white to cream when fresh, bruising brown. A lateral stipe (stem) is often present, 3-15 cm long, cylindrical, and equally lacquered. The flesh (context) is tough, woody (corky to leathery), and cream to dark brown. The spore print is brown. The overall texture is far too woody and bitter for culinary use; this is exclusively a medicinal fungus. The species epithet 'lucidum' means 'shining' or 'brilliant,' referring to the distinctive varnished cap surface.
Habitat
In the wild, Ganoderma lucidum grows as a saprotroph and weak parasite on dead or dying hardwood trees, particularly oaks (Quercus spp.), maples (Acer spp.), elms (Ulmus spp.), and other deciduous species. It favors warm, humid temperate and subtropical forests. Fruiting bodies typically emerge from the base of stumps or buried roots during late spring through autumn. Wild specimens are relatively uncommon and highly prized in traditional medicine, historically commanding premium prices in East Asian herbal markets.
Distribution
The Ganoderma lucidum species complex has a cosmopolitan distribution across temperate, subtropical, and tropical regions worldwide, including East Asia (China, Japan, Korea), Southeast Asia, Europe, North and South America, Africa, and Australasia. The greatest diversity of Ganoderma species and the longest continuous tradition of medicinal use are found in East Asia, particularly China and Japan. Modern taxonomic revision has revealed that most commercially cultivated 'G. lucidum' in China corresponds to G. lingzhi. True G. lucidum sensu stricto is primarily European and North American. However, the pharmacological literature and commercial market overwhelmingly use the name G. lucidum for all medicinal reishi products regardless of precise species identity.
Parts Used
Fruiting body (Ganoderma, Lingzhi)
Preferred: Dried sliced fruiting body for decoction; hot-water or dual (water + ethanol) extract powder; standardized extract capsules
The dried fruiting body (basidiocarp) is the traditional and pharmacopeial drug. It is the primary part listed in the Chinese Pharmacopoeia and Japanese Pharmacopoeia reference. Contains the full spectrum of triterpenoids (ganoderic acids), polysaccharides (beta-glucans), and other bioactive constituents. Sliced, powdered, or extracted for use. The extremely woody, bitter, and tough texture requires decoction or extraction rather than simple infusion.
Mycelium (cultured mycelial biomass)
Preferred: Dried mycelial powder or extract; capsules
Commercially produced by submerged liquid fermentation or solid-state fermentation on grain substrates. Contains polysaccharides (including beta-glucans and exopolysaccharides) and some triterpenoids, though the triterpenoid profile and concentration may differ significantly from the fruiting body. Products grown on grain substrates may contain substantial amounts of residual starch. Quality and composition vary widely by production method. Some clinical studies have used mycelial preparations specifically.
Spores (broken-wall spore powder)
Preferred: Broken-wall (shell-broken) spore powder; spore oil soft capsules
Mature basidiospores collected from fruiting bodies and mechanically cracked to improve bioavailability. Spores are rich in triterpenoids (especially ganoderic acids) and lipids (sporoderm-broken spore oil). Considered a premium preparation in contemporary Chinese and Japanese practice. The intact spore wall (chitin) is largely indigestible; wall-breaking is essential for therapeutic use. Sold as broken-wall spore powder or spore oil capsules.
Key Constituents
Triterpenoids (ganoderic acids and related lanostane-type compounds)
Triterpenoids are considered the primary pharmacologically distinctive constituents of reishi, responsible for anti-inflammatory, hepatoprotective, anti-allergic (histamine release inhibition), hypotensive (ACE inhibition), anti-platelet aggregation, and cytotoxic/anti-tumor activities. The triterpenoid content and profile serve as key quality markers for reishi products. Chinese Pharmacopoeia requires minimum triterpenoid content. These compounds are lipophilic and require alcoholic or hydroalcoholic extraction; they are poorly extracted by water alone. The extreme bitterness of reishi is directly correlated with triterpenoid content and is thus considered a positive quality indicator.
Polysaccharides (beta-glucans and heteropolysaccharides)
Polysaccharides are the primary immunomodulating constituents and among the most extensively studied components of reishi. They modulate both innate and adaptive immunity: enhancing macrophage phagocytosis, increasing natural killer cell cytotoxicity, promoting dendritic cell maturation, and modulating T-helper cell balance (Th1/Th2). Importantly, reishi polysaccharides are considered immunomodulating rather than simply immunostimulating -- they may up-regulate suppressed immune function while tempering overactive immune responses, which distinguishes them from purely immunostimulant agents. This bidirectional immunomodulation is the basis for reishi's traditional reputation as an immune tonic suitable for long-term use. Hot-water extraction is the traditional and most efficient method for polysaccharide recovery.
Nucleosides and nucleotides
Nucleoside constituents contribute to the cardiovascular and nervous system effects of reishi. Adenosine's inhibition of platelet aggregation complements the antiplatelet activity of ganoderic acids. Adenosine receptor activation also modulates inflammatory responses and provides neuroprotective effects.
Sterols and lipids
Ergosterol and its derivatives contribute to anti-inflammatory activity (ergosterol peroxide has demonstrated anti-inflammatory and cytotoxic effects in vitro). The lipid fraction of spores is the basis for commercial spore oil products, which concentrate both fatty acids and lipophilic triterpenoids.
Minerals and trace elements
The organic germanium content of reishi has been cited as a contributor to its immunomodulating properties, though the clinical significance of germanium at dietary intake levels remains uncertain. Trace mineral content contributes modestly to the overall nutritional and therapeutic profile.
Proteins and peptides
LZ-8 is of research interest as a potential immunomodulatory and anti-allergic agent. While not a major constituent by mass, it represents the protein-based immunomodulatory activity of reishi distinct from polysaccharide and triterpenoid fractions.
Herbal Actions
Modulates and balances immune function
The hallmark pharmacological action of reishi. Beta-glucan polysaccharides activate innate immune cells (macrophages, dendritic cells, natural killer cells) via pattern recognition receptors (Dectin-1, CR3, TLR-2/6). Enhances phagocytosis, cytokine production (IL-2, IL-6, IFN-gamma, TNF-alpha), and NK cell cytotoxicity. Crucially, reishi demonstrates bidirectional immunomodulation -- up-regulating suppressed immune function while potentially tempering excessive immune activation (Th1/Th2 balancing). Multiple RCTs and a Cochrane-reviewed body of evidence in cancer patients demonstrate measurable immune parameter changes. Wachtel-Galor et al. (2011) comprehensive review confirmed immunomodulatory effects across study types.
[1, 3, 4, 10]Helps the body adapt to stress and restore homeostasis
Classified as an adaptogen in modern integrative practice based on its ability to support stress resistance, normalize physiological processes, and promote homeostasis. In traditional Chinese medicine, Lingzhi is classified as a 'superior' (shang pin) herb in the Shennong Ben Cao Jing, defined as a tonic that nourishes life without toxicity and can be taken long-term. Modern evidence for adaptogenic classification includes: HPA axis modulation, anti-fatigue effects in clinical trials (Tang et al. 2005), improved quality of life measures in cancer patients (Zhao et al. 2012), and broad multi-system normalizing effects.
[1, 6, 7]Supports and calms the nervous system
Reishi has demonstrated clinically significant effects on sleep quality and nervous system function. Cui et al. (2012) found that reishi extract significantly improved sleep quality parameters in neurasthenia patients, with increased total sleep time and reduced sleep latency. Traditional Chinese classification places Lingzhi as 'calming the shen (spirit)' -- a category reserved for herbs that settle restlessness, anxiety, and disturbed sleep. Adenosine content may contribute to sedative-like effects via purinergic receptor activation.
[1, 2, 5]Protects the liver from damage
Multiple preclinical studies demonstrate hepatoprotective effects of reishi triterpenoids and polysaccharides. Ganoderic acids A, B, and C1 protected against carbon tetrachloride-induced liver injury in animal models, reducing elevated liver enzymes (ALT, AST), inhibiting hepatic lipid peroxidation, and enhancing antioxidant enzyme activity (SOD, catalase, glutathione peroxidase). Clinical studies in hepatitis B patients have shown reductions in liver enzymes and improvements in liver function markers, though large-scale confirmatory trials are limited. Traditional use for liver support is extensively documented across Chinese, Japanese, and Korean practice.
[1, 2, 3]Reduces inflammation
Ganoderic acids inhibit the release of histamine from mast cells (ganoderic acids C and D), suppress pro-inflammatory cytokine production (TNF-alpha, IL-1beta, IL-6) via NF-kB inhibition, and inhibit 5-lipoxygenase and cyclooxygenase-2. Polysaccharide fractions also demonstrate anti-inflammatory effects by modulating macrophage cytokine profiles. In vivo studies show suppression of carrageenan-induced paw edema and other inflammatory models. The anti-inflammatory action is considered secondary because it is downstream of the primary immunomodulating activity.
[1, 3]Prevents or slows oxidative damage to cells
Polysaccharide and triterpenoid fractions demonstrate significant antioxidant activity through multiple mechanisms: direct free radical scavenging (DPPH, superoxide, hydroxyl radicals), enhancement of endogenous antioxidant enzymes (superoxide dismutase, catalase, glutathione peroxidase), chelation of pro-oxidant metal ions, and inhibition of lipid peroxidation. Wachtel-Galor et al. demonstrated increased plasma total antioxidant capacity in healthy volunteers after reishi supplementation. The antioxidant activity contributes to hepatoprotective, neuroprotective, and anti-aging effects.
[1, 3]Strengthens and tones the heart muscle
Reishi demonstrates multiple cardiovascular-supporting actions: ganoderic acids inhibit angiotensin-converting enzyme (ACE), contributing to mild blood pressure reduction; adenosine promotes vasodilation and inhibits platelet aggregation; triterpenoids inhibit cholesterol synthesis (HMG-CoA reductase inhibition demonstrated in vitro); polysaccharides improve blood lipid profiles in animal models. Clinical studies have reported modest reductions in blood pressure and improvements in lipid profiles, though large-scale cardiovascular outcome trials are lacking.
[1, 3]Lowers blood pressure
Mild blood pressure-lowering effect mediated by ACE inhibition (ganoderic acids), vasodilation (adenosine), and potential calcium channel modulation. Clinical effects are modest and typically observed as a secondary benefit in patients taking reishi for other indications. Should be considered in patients already on antihypertensive medications due to potential additive effects.
[1]Stimulates digestive secretions via bitter taste receptors
The ganoderic acid triterpenoids produce an intensely bitter taste. This bitterness is a hallmark quality indicator for authentic reishi preparations -- products that are not markedly bitter likely have low triterpenoid content. The bitter quality stimulates digestive secretions and may contribute to hepatobiliary function support through the bitter reflex pathway. In traditional Chinese medicine, the bitter taste is associated with clearing heat and draining dampness.
[1, 2]Promotes the discharge of mucus from the respiratory tract
Traditional indication for cough and respiratory phlegm. Lingzhi is traditionally used to 'transform phlegm' in Chinese medicine and to support respiratory function in chronic bronchitis and asthma. Limited modern clinical evidence specific to expectorant action, though immunomodulating effects on respiratory mucosal immunity may contribute. Some open-label studies in chronic bronchitis patients have reported symptom improvement.
[1, 2]Promotes sleep and deep relaxation
Mild sedative/sleep-promoting activity demonstrated in the Cui et al. (2012) study. Mechanism may involve adenosine receptor activation and GABAergic modulation, though the precise sedative mechanism in humans is not fully characterized. The effect is gentle rather than strongly soporific, consistent with its traditional classification as a shen-calming tonic rather than a potent sedative. Best used as part of a long-term calming regimen rather than acute sedation.
[1, 5]Therapeutic Indications
Immune System
Immunodeficiency and immune support (general)
Multiple clinical studies demonstrate enhancement of immune parameters with reishi supplementation. Gao et al. (2003) RCT in advanced-stage cancer patients found significant increases in CD3+, CD4+, and CD8+ T-lymphocyte counts, elevated NK cell activity, and improved CD4/CD8 ratios after 12 weeks of Ganopoly (G. lucidum polysaccharide extract). Wachtel-Galor et al. (2011) systematic review confirmed consistent immunomodulatory effects across study types. Traditional use as a superior immune tonic spans 2000+ years.
[1, 4, 10]Adjunctive support during cancer treatment
A Cochrane systematic review (Jin et al. 2016) of 5 RCTs (n=373) found that patients receiving reishi alongside conventional chemo/radiotherapy were 1.27 times more likely to respond to treatment than those on conventional therapy alone. Reishi enhanced immune function markers (CD3+, CD4+, CD8+, NK cell activity) and may reduce chemotherapy-related side effects. However, no studies used reishi as sole anti-cancer therapy, and quality of evidence was rated low to moderate. Reishi is used as an immune-supportive adjunct, NOT as a cancer treatment.
[4, 7, 8]Recurrent upper respiratory infections
Traditional use as an immune tonic to reduce susceptibility to recurrent infections. The immunomodulating polysaccharides enhance mucosal and systemic immune surveillance. Limited direct clinical data on URI frequency reduction specifically, though immune parameter enhancement is well documented.
[1, 2]Nervous System
Insomnia and poor sleep quality
Cui et al. (2012) found that Ganoderma lucidum extract significantly improved sleep quality as measured by the Pittsburgh Sleep Quality Index (PSQI). Increased total sleep time, reduced sleep latency, and improved subjective sleep quality were observed. Traditional TCM classification as shen-calming supports this indication. Tang et al. (2005) also reported improvements in fatigue and well-being in neurasthenia patients.
[1, 5, 6]Neurasthenia (chronic fatigue with nervous debility)
Tang et al. (2005) RCT specifically enrolled patients with neurasthenia. Significant improvements were seen in overall well-being, fatigue, and quality of life measures with G. lucidum polysaccharide extract. Reishi is traditionally classified as a qi tonic that addresses depletion and weakness.
[5, 6]Anxiety and restlessness
Lingzhi is classified as a shen-calming (an shen) herb in traditional Chinese medicine, indicated for restlessness, anxiety, palpitations with anxiety, and an unsettled mind. While no large-scale RCTs have specifically targeted generalized anxiety disorder with reishi, the clinical improvement in sleep quality and neurasthenia symptoms supports anxiolytic/calming activity. Adenosine content may mediate anxiolytic effects through purinergic receptor modulation.
[1, 2]Cardiovascular System
Hypertension (mild, as adjunctive therapy)
Ganoderic acids demonstrate ACE inhibitory activity in vitro. Modest blood pressure-lowering effects have been reported in clinical and observational studies. Adenosine contributes to vasodilation. The effect is mild and reishi is best considered an adjunctive rather than primary antihypertensive agent. Patients on antihypertensive medications should be monitored for additive effects.
[1, 3]Hyperlipidemia (elevated cholesterol and triglycerides)
In vitro studies demonstrate ganoderic acid inhibition of HMG-CoA reductase (the target of statin drugs). Animal studies show reductions in total cholesterol, LDL-C, and triglycerides with reishi supplementation. Limited clinical data; some open-label studies report modest lipid profile improvements. Requires larger, well-designed clinical trials for confirmation.
[1, 3]Platelet aggregation and thrombotic risk (adjunctive)
Ganoderic acids and adenosine both inhibit platelet aggregation in vitro and in animal models. Clinical significance at dietary supplement doses is uncertain but may contribute to overall cardiovascular risk modification. This antiplatelet activity is the basis for the drug interaction caution with anticoagulant and antiplatelet medications.
[1, 3]Hepatobiliary System
Hepatoprotection and liver support (general)
Ganoderic acids and polysaccharides demonstrate hepatoprotective activity in multiple animal models of liver injury (CCl4, D-galactosamine, Bacillus Calmette-Guerin/LPS). Mechanisms include: enhancement of hepatic antioxidant enzyme activity (SOD, GPx, catalase), inhibition of lipid peroxidation, suppression of hepatic stellate cell activation (anti-fibrotic), and modulation of hepatic inflammatory cytokines. Clinical studies in hepatitis B patients have shown improvements in liver function markers, though study quality is variable.
[1, 3]Chronic hepatitis B (adjunctive)
Several Chinese clinical studies have investigated reishi preparations as adjunctive treatment for chronic hepatitis B, reporting improvements in liver enzymes (ALT, AST) and, in some cases, HBV viral load reduction. However, study methodologies have been heterogeneous, many lacked adequate controls, and reishi is not recommended as a standalone antiviral treatment. Use as a hepatoprotective adjunct alongside standard antiviral therapy may be considered.
[1]Respiratory System
Chronic bronchitis and respiratory support
Traditional Chinese medicine indication for cough, dyspnea, and phlegm transformation. Open-label Chinese clinical studies in chronic bronchitis patients have reported symptomatic improvement (reduced cough, dyspnea, and phlegm production) with reishi preparations. The immunomodulating effects on respiratory mucosal immunity likely contribute. Limited high-quality clinical trial data specific to respiratory indications.
[1, 2]Allergic asthma (adjunctive)
Ganoderic acids inhibit histamine release from mast cells. Immunomodulating effects may help rebalance Th1/Th2 ratios (often skewed toward Th2 in allergic disease). Preclinical studies show anti-allergic and anti-asthmatic effects. Limited clinical data, though some open-label studies report reduced symptom severity and medication requirements in asthmatic patients. Requires controlled trials for validation.
[1, 3]Endocrine System
Blood sugar regulation and metabolic support
Ganoderan B (polysaccharide fraction) demonstrated significant hypoglycemic activity in diabetic animal models. Several clinical studies have reported modest blood glucose-lowering effects and improved insulin sensitivity with reishi supplementation. Mechanisms include enhancement of hepatic glucose utilization, stimulation of insulin secretion, and inhibition of alpha-glucosidase. Clinical evidence is preliminary and doses used have been variable.
[1, 9]Adrenal support and HPA axis modulation
As a classified adaptogen, reishi is traditionally used to support healthy stress response and adrenal function. Animal studies demonstrate modulation of corticosterone levels and improved stress tolerance. The adaptogenic classification implies normalization of HPA axis function, though direct clinical measurement of adrenal parameters in humans is limited.
[1, 2]Lymphatic System
Lymphatic and immune system tonic
Reishi's immunomodulating polysaccharides activate cells of the lymphatic and reticuloendothelial system, including macrophages, dendritic cells, and lymphocytes in lymph nodes and spleen. Traditional use as a broad-spectrum immune and vital force tonic encompasses lymphatic system support. Modern evidence of enhanced lymphocyte proliferation and cytokine production supports this traditional indication.
[1, 10]Energetics
Temperature
neutral
Moisture
neutral
Taste
Tissue States
cold/depression, damp/stagnation, wind/tension
In traditional Chinese medicine, Lingzhi is classified as sweet and neutral in the Shennong Ben Cao Jing, though modern TCM texts often add bitter and slightly warm. The sweet taste reflects its tonic, nourishing quality (qi and blood tonic), while the bitter taste corresponds to its high triterpenoid content and clearing/descending action. In Western herbal energetics, reishi is considered neutral to slightly warm in temperature and neutral in moisture -- neither strongly drying nor moistening. This balanced energetic profile aligns with its classification as an adaptogen suitable for a wide range of constitutional types. The mild sweetness indicates its tonic, nutritive quality, while the pronounced bitterness supports hepatobiliary and digestive function. Reishi addresses cold/depressed tissue states (immune deficiency, fatigue, depletion), damp/stagnant states (congested liver, metabolic sluggishness), and wind/tension states (anxiety, restlessness, disturbed shen). CAVEAT: Herbal energetics are interpretive frameworks within Western herbalism and TCM, not standardized across all practitioners.
Traditional Uses
Classical Chinese medicine (Shennong Ben Cao Jing, ca. 200 CE)
- Classified as a 'superior' (shang pin) herb, indicating safety for long-term use and tonic properties
- Nourishing vital essence (jing), tonifying qi, and calming the spirit (shen)
- Treating deafness, joint stiffness, and maintaining vital energy
- Supporting respiratory function and relieving cough and dyspnea
- Strengthening the heart and improving memory and cognition
- Promoting longevity and resistance to aging
"The Shennong Ben Cao Jing (Divine Farmer's Classic of Materia Medica, ca. 200 CE) describes six types of Zhi (Lingzhi), classified by color: Chi Zhi (red), Zi Zhi (purple), Qing Zhi (green/blue), Bai Zhi (white), Huang Zhi (yellow), and Hei Zhi (black). Of Chi Zhi (red Lingzhi, corresponding to G. lucidum): 'It has a bitter taste. Its main function is to unblock the chest area, boost the heart qi, nourish the middle, sharpen the wit, and improve the memory. Eating it over a long period of time will lighten the body and prevent aging, extending one's years and making one an immortal.'"
Traditional Chinese medicine (post-classical and contemporary TCM)
- Tonifying qi and nourishing blood for deficiency patterns (fatigue, weakness, poor appetite)
- Calming the shen: treating insomnia, restlessness, palpitations with anxiety, and disturbed dreams
- Relieving cough and dyspnea (wheezing) by transforming phlegm
- Supporting liver function and treating chronic hepatitis
- Boosting wei qi (defensive qi/immune function) against recurrent infections
- Adjunctive support during cancer treatment to reduce side effects and support immunity
"Li Shizhen's Bencao Gangmu (Compendium of Materia Medica, 1578 CE) expanded on earlier classifications, describing Lingzhi as 'nourishing, strengthening, non-toxic, and able to treat a host of diseases by fortifying the vital organs.' Contemporary TCM formularies classify Lingzhi (G. lucidum) under 'herbs that calm the spirit' (an shen yao) and secondarily under 'herbs that tonify qi' (bu qi yao)."
Japanese traditional medicine (Kampo and folk medicine)
- Mannentake ('ten-thousand-year mushroom') used as a longevity tonic
- Supporting liver function and treating hepatic disorders
- Immune support and general health maintenance
- Cardiovascular health and blood pressure regulation
- As a component in health teas and functional food preparations
"In Japan, Reishi is known as Mannentake (literally 'ten-thousand-year mushroom') and Sarunokosuikake. While not a primary drug in classical Kampo formulas (which are based on Chinese herbal combinations), reishi has been used extensively in Japanese folk medicine and is widely consumed as a health supplement. Japan was a pioneer in reishi commercial cultivation beginning in the early 1970s."
[1]
Korean traditional medicine
- Known as Yeongji or Bulgye ('herb of immortality')
- Used as a general tonic for longevity, vitality, and disease prevention
- Treating chronic fatigue and debility
- Supporting liver and kidney function
- Enhancing mental clarity and calming the spirit
"In Korean traditional medicine, Yeongji (Lingzhi) holds a revered position similar to its status in Chinese medicine. Korean pharmacopeial and traditional texts describe it as a supreme tonic for extending life and preventing disease. Modern South Korea is a significant producer of cultivated reishi products."
[1]
Modern Research
Comprehensive review of Ganoderma lucidum as a medicinal mushroom
Chapter in the 'Herbal Medicine: Biomolecular and Clinical Aspects' textbook providing a comprehensive review of G. lucidum chemistry, pharmacology, and clinical evidence. Covers immunomodulation, anti-cancer properties, cardiovascular effects, hepatoprotection, anti-diabetic activity, and safety.
Findings: Documented over 400 bioactive compounds in G. lucidum, including triterpenoids (ganoderic acids), polysaccharides (beta-glucans), nucleosides, sterols, and proteins. Confirmed immunomodulatory activity across multiple in vitro, in vivo, and clinical studies. Noted that reishi polysaccharides enhance both innate and adaptive immunity while triterpenoids provide anti-inflammatory, hepatoprotective, and lipid-lowering effects. Identified reishi as one of the most extensively studied medicinal mushrooms with a long safety record.
Limitations: Narrative review; not a systematic review with formal quality assessment. Heterogeneity of reishi preparations across studies makes comparison difficult.
[1]
Ganoderma lucidum for cancer treatment (Cochrane systematic review)
Cochrane systematic review of randomized controlled trials evaluating G. lucidum preparations for cancer treatment. Five RCTs (n=373) met inclusion criteria. All used reishi alongside conventional cancer treatments (chemo/radiotherapy).
Findings: Patients receiving reishi alongside conventional therapy were 1.27 times more likely to respond to treatment (RR 1.27, 95% CI 0.92-1.75). Reishi significantly enhanced immune parameters: NK cell activity increased, CD3+, CD4+, and CD8+ T-cell counts improved. Patients on reishi reported improved quality of life. No significant adverse events attributable to reishi were identified. However, no study evaluated reishi as sole cancer therapy.
Limitations: Only 5 RCTs met inclusion criteria, with total n=373. Study quality was generally low to moderate (Jadad scores 1-3). All studies were conducted in China. Heterogeneous reishi preparations and dosing. Risk of publication bias. Insufficient evidence to recommend reishi as first-line cancer treatment.
[8]
Reishi polysaccharide extract for neurasthenia (fatigue and sleep)
Randomized, double-blind, placebo-controlled trial of G. lucidum polysaccharide extract in patients with neurasthenia, assessing fatigue, sleep quality, and overall well-being as primary outcomes.
Findings: Reishi extract significantly improved fatigue scores, overall well-being, and quality of life measures compared to placebo. Sleep quality parameters also improved. Improvements were apparent by week 4 and continued to week 8 of treatment. No significant adverse effects were reported. The results support traditional use of reishi as a tonic for fatigue and debility.
Limitations: Conducted in a Chinese population with neurasthenia diagnosis. Single-center. Polysaccharide extract preparation; results may not generalize to other reishi preparations. Subjective outcome measures.
[6]
Reishi extract and sleep quality
Investigation of the effects of Ganoderma lucidum extract on sleep parameters, providing evidence for the traditional shen-calming indication.
Findings: Reishi extract significantly improved total sleep time, reduced sleep latency, and improved overall PSQI scores compared to controls. The sleep-promoting effects were consistent with traditional TCM classification of Lingzhi as a shen-calming herb. Adenosine and polysaccharide constituents were proposed as contributing mechanisms.
Limitations: Study design and population specifics limit generalizability. Subjective sleep measures only (no polysomnography). Specific to polysaccharide-enriched extract.
[5]
Immunomodulating effects of Ganopoly in advanced cancer patients
Randomized, double-blind, placebo-controlled trial of Ganopoly (G. lucidum polysaccharide extract, 1800 mg three times daily) in 68 patients with advanced-stage solid tumors over 12 weeks.
Findings: Ganopoly treatment resulted in significant increases in absolute counts of CD3+ T-cells (P < 0.01), CD4+ T-cells (P < 0.01), CD8+ T-cells (P < 0.05), and NK cell activity (P < 0.01) compared to placebo. Lymphocyte mitogenic response to phytohemagglutinin (PHA) was also enhanced. Plasma concentrations of IL-2, IL-6, and IFN-gamma increased significantly. Quality of life (Karnofsky score) improved modestly. No significant adverse effects.
Limitations: Relatively small sample size (n=68). Chinese patient population. Single commercial product tested. Immune parameters are surrogate outcomes; long-term survival data not reported. Patients continued concurrent conventional therapies.
[4]
Reishi spore powder for cancer-related fatigue in breast cancer patients
Randomized, placebo-controlled trial evaluating spore powder of G. lucidum (1000 mg three times daily) on cancer-related fatigue and quality of life in breast cancer patients undergoing endocrine therapy over 4 weeks.
Findings: Reishi spore powder significantly reduced cancer-related fatigue scores (FACT-F, P < 0.01) and improved overall quality of life (FACT-G) compared to placebo. Improvements were noted in physical well-being, emotional well-being, and functional well-being domains. Anxiety and depression scores (HADS) were also reduced in the reishi group.
Limitations: Short intervention period (4 weeks). Moderate sample size. Breast cancer population only. Spore powder preparation; results may differ with other reishi preparations. Single-center Chinese study.
[7]
Review of pharmacological and clinical evidence for G. lucidum polysaccharides
Comprehensive review of the immunomodulatory and anti-tumor mechanisms of G. lucidum polysaccharides, integrating in vitro, in vivo, and clinical evidence.
Findings: G. lucidum polysaccharides activate immune effector cells via Dectin-1, TLR-2, TLR-4, and complement receptor 3 signaling pathways. Downstream effects include enhanced macrophage phagocytosis, NK cell cytotoxicity, dendritic cell maturation, T-helper cell cytokine production, and B-cell antibody responses. Anti-tumor effects are primarily immune-mediated rather than directly cytotoxic. Clinical studies demonstrate measurable immune enhancement in both healthy subjects and cancer patients.
Limitations: Narrative review. Many cited studies used proprietary polysaccharide fractions that may not be generalizable. In vitro and animal model results do not always translate to clinical outcomes. Variable extraction methods and polysaccharide characterization across studies.
[10]
Pharmacological properties of Ganoderma lucidum triterpenoids and polysaccharides
Comprehensive review of the pharmacological activities of G. lucidum triterpenoids (ganoderic acids) and polysaccharides, covering anti-inflammatory, anti-tumor, hepatoprotective, anti-HIV, hypotensive, and hypoglycemic activities.
Findings: Over 130 triterpenoids identified from G. lucidum with diverse pharmacological activities. Ganoderic acids demonstrate cytotoxicity against cancer cell lines, inhibit tumor invasion and metastasis, inhibit histamine release from mast cells, and inhibit ACE and cholesterol synthesis. Polysaccharides enhance immune function through multiple signaling pathways. The dual extraction (water for polysaccharides, ethanol for triterpenoids) approach captures the full spectrum of bioactive compounds.
Limitations: Review article synthesizing heterogeneous studies. Many triterpenoid bioactivity studies are in vitro with uncertain in vivo relevance. Structure-activity relationships for individual ganoderic acids are complex and incomplete.
[3]
Hypoglycemic effects of Ganoderma lucidum in type II diabetes
Phase I/II study investigating the blood glucose-lowering effects and safety of G. lucidum extract in patients with type II diabetes mellitus.
Findings: G. lucidum extract supplementation was associated with modest reductions in fasting blood glucose and HbA1c in diabetic patients. The hypoglycemic mechanism was attributed to polysaccharide fractions (ganoderans) that enhance hepatic glucose utilization and stimulate insulin release. The supplement was well tolerated with no serious adverse effects.
Limitations: Phase I/II design without rigorous placebo control. Small sample size. Short observation period. Specific commercial extract tested; results may not generalize to other preparations. Dose-response relationship not fully characterized.
[9]
Preparations & Dosage
Decoction
Strength: 3-10 g dried fruiting body per 500-750 mL water; traditional decoction ratio approximately 1:50-1:75
Slice dried fruiting body into thin pieces or use coarsely ground powder. Add 3-10 g of dried fruiting body to 500-750 mL of cold water. Bring to a boil, then reduce to a gentle simmer for 30-60 minutes (or up to 2 hours for a more concentrated preparation). Strain and drink. The woody fruiting body requires prolonged decoction to extract polysaccharides and water-soluble compounds. The resulting liquid will be bitter, dark amber to brown. A second decoction from the same material is traditional -- add fresh water and simmer again for 30-45 minutes, then combine with the first decoction.
3-10 g dried fruiting body per day, decocted in 2-3 cups of water. Drink throughout the day in 2-3 divided doses.
1-2 times daily (decoction prepared once and divided into portions)
May be used long-term as a daily tonic. Traditional use supports extended daily consumption. Reassess therapeutic need periodically.
Not generally recommended in children under 12 due to lack of pediatric safety data. For adolescents: half adult dose under practitioner guidance.
Decoction is the traditional preparation method in Chinese medicine and the most appropriate for the extremely hard, woody fruiting body. Hot water extraction efficiently extracts polysaccharides (beta-glucans) and water-soluble glycopeptides. However, decoction alone does NOT efficiently extract the lipophilic triterpenoids (ganoderic acids); a dual extraction (water + alcohol) captures the full spectrum of bioactive compounds. The strong bitter taste is normal and indicates triterpenoid content. Can be sweetened with honey or combined with dates or goji berries to improve palatability.
Tincture
Strength: 1:5, 60-75% ethanol (dried fruiting body). Dual-extraction tinctures combine hydroalcoholic and aqueous extracts.
Use dried, finely chopped or powdered fruiting body. Standard maceration: 1:5 ratio in 60-75% ethanol (higher alcohol concentration needed for effective triterpenoid extraction from woody material). Macerate for 4-6 weeks with daily agitation. Press and filter. For a dual-extraction tincture: prepare a standard ethanol tincture AND a separate hot-water decoction (simmered 2 hours), then combine the strained liquids.
2-5 mL (40-100 drops) three times daily
Two to three times daily
May be used long-term. Reassess periodically.
Not recommended for children due to alcohol content and lack of pediatric data
Tincture preparation is essential for extracting lipophilic triterpenoids (ganoderic acids) which are not efficiently extracted by water alone. The higher alcohol content (60-75%) compared to many herbal tinctures reflects the need to solubilize these resinous, bitter compounds from the extremely dense woody matrix. A dual-extraction tincture (combining separate ethanol and water extractions) provides the most complete chemical profile, capturing both triterpenoids and polysaccharides. Commercial 'dual-extract' or 'double-extract' reishi tinctures follow this principle.
Capsule / Powder
Strength: Crude powder: 500 mg per capsule. Extract powder: varies by manufacturer, typically 4:1 to 15:1 concentration ratio
Dried fruiting body, finely powdered (ground to pass through a 60-80 mesh sieve), filled into vegetarian or gelatin capsules. Alternatively, concentrated extract powder (hot-water or dual-extracted) encapsulated. Chinese Pharmacopoeia method: powdered Lingzhi, 1-3 g per dose.
Crude powder: 1-3 g (2-6 capsules of 500 mg) daily in divided doses. Extract powder (concentrated): 0.5-1.5 g daily depending on concentration ratio.
2-3 times daily with water, taken with meals to reduce gastric discomfort
May be used long-term as a daily supplement
Not well-established for children. Adolescents: half adult dose under practitioner supervision.
Capsules of powdered fruiting body are convenient but bioavailability of raw, unextracted reishi powder may be limited due to the indigestible chitin cell wall matrix. Extracted (hot-water or dual-extracted) powders encapsulated are preferred for therapeutic use as extraction breaks open cell walls and concentrates active constituents. Products should specify whether they contain crude powder or extract, and whether derived from fruiting body or mycelium-on-grain (which may contain significant residual starch).
Standardized Extract
Strength: Varies by manufacturer. Ganopoly: 600 mg polysaccharide extract per capsule. Common DER 10:1 to 15:1 hot-water extract. Dual extracts standardized to >= 30% polysaccharides + >= 4% triterpenes.
Commercially prepared standardized extracts, typically hot-water extracted (for polysaccharides) or dual water/ethanol extracted (for polysaccharides AND triterpenoids). Products are standardized to minimum polysaccharide content (commonly >= 30% beta-glucans) and/or triterpenoid content (commonly >= 4% ganoderic acids). Clinical trial products include Ganopoly (polysaccharide extract) and various branded preparations.
Polysaccharide extract: 1800-5400 mg daily (based on Ganopoly clinical trials: 1800 mg three times daily). Dual extract: dosage varies by product concentration; follow manufacturer guidelines or practitioner recommendation. Standardized to >= 30% polysaccharides and/or >= 4% triterpenoids.
Two to three times daily
Clinical trials used 4-12 weeks of continuous supplementation. Long-term use appears safe based on traditional use history.
Not established in standardized extract form
Standardized extracts are the form used in the majority of published clinical trials and provide the most reproducible dosing. The distinction between polysaccharide-only (hot-water) extracts and dual (water + alcohol) extracts is important: polysaccharide extracts primarily support immune function, while dual extracts additionally provide triterpenoids for hepatoprotective, anti-inflammatory, and cardiovascular effects. Product quality varies significantly in the commercial market. Third-party testing for beta-glucan content (rather than total polysaccharides, which may include non-bioactive starch) is recommended.
Syrup
Strength: Concentrated decoction with honey in approximately 1:1 ratio
Prepare a concentrated decoction by simmering 50-100 g dried fruiting body slices in 1 L water for 2-3 hours. Strain, then reduce liquid by simmering to approximately 250-300 mL. Add equal volume of raw honey (250-300 mL). Stir thoroughly. Optionally add a small amount of brandy or vegetable glycerin as preservative. Store refrigerated.
1-2 tablespoons (15-30 mL) twice daily
Twice daily
Consume within 2-3 months if refrigerated
Not recommended for children under 12
Syrup preparation improves palatability of the intensely bitter reishi decoction. The honey also adds its own mild antimicrobial and demulcent properties. This preparation primarily extracts polysaccharides. A variation involves adding a small amount of reishi tincture to the finished syrup to incorporate triterpenoids. Not a traditional Chinese preparation but popular in Western herbal practice.
[1]
Safety & Interactions
Class 1
Can be safely consumed when used appropriately (AHPA Botanical Safety Handbook)
Contraindications
Although rare, allergic reactions to Ganoderma lucidum have been reported, including one case report of allergic alveolitis (hypersensitivity pneumonitis) in a mushroom farmer with occupational spore exposure. Individuals with confirmed allergy to G. lucidum or related fungi should not use reishi products.
Due to the antiplatelet activity of ganoderic acids and adenosine, reishi should be discontinued at least 2 weeks prior to elective surgery to minimize theoretical risk of increased intraoperative bleeding. This is a precautionary recommendation consistent with general guidance for herbs with antiplatelet properties.
The antiplatelet and potential anticoagulant properties of reishi triterpenoids and adenosine may theoretically exacerbate active bleeding or increase bleeding risk in patients with established coagulopathies. Use with caution and close clinical monitoring if deemed necessary.
Drug Interactions
| Drug / Class | Severity | Mechanism |
|---|---|---|
| Warfarin, heparin, and other anticoagulants (Anticoagulants) | moderate | Ganoderic acids and adenosine inhibit platelet aggregation in vitro and in animal models. Combined use with pharmacological anticoagulants could theoretically increase bleeding risk through additive antiplatelet and anticoagulant effects. |
| Aspirin, clopidogrel, and other antiplatelet agents (Antiplatelet agents) | moderate | Additive inhibition of platelet aggregation. Ganoderic acids inhibit ADP- and collagen-induced platelet aggregation via mechanisms that may be additive with pharmaceutical antiplatelet agents. |
| Cyclosporine, tacrolimus, and other immunosuppressants (Immunosuppressants) | theoretical | Reishi's immunomodulating (immune-enhancing) properties could theoretically oppose the immunosuppressive effects of transplant anti-rejection medications and other immunosuppressants. Polysaccharide-mediated enhancement of T-cell, NK cell, and macrophage activity could counteract drug-induced immunosuppression. |
| Antihypertensive medications (ACE inhibitors, ARBs, calcium channel blockers, beta-blockers) (Antihypertensives) | minor | Additive blood pressure-lowering effect. Ganoderic acids demonstrate ACE inhibitory activity, and adenosine promotes vasodilation. Combined use with pharmaceutical antihypertensives could result in enhanced hypotensive effects. |
| Insulin, metformin, sulfonylureas, and other antidiabetic medications (Hypoglycemic agents) | theoretical | Reishi polysaccharides (ganoderans) demonstrate hypoglycemic activity in animal models, and preliminary clinical observations suggest modest blood glucose-lowering effects. Additive hypoglycemia is theoretically possible when combined with pharmacological antidiabetic agents. |
Pregnancy & Lactation
Pregnancy
insufficient data
Lactation
insufficient data
There is insufficient clinical safety data on the use of Ganoderma lucidum during pregnancy and lactation. No controlled studies in pregnant or breastfeeding women have been conducted. Traditional Chinese medicine texts do not explicitly contraindicate Lingzhi in pregnancy, but also do not specifically recommend it during pregnancy. The immunomodulating, antiplatelet, and hormonal-modulating properties raise theoretical concerns for use during pregnancy. As a precautionary measure, therapeutic doses of reishi supplements should be avoided during pregnancy and breastfeeding unless specifically recommended by a qualified practitioner. Brief, occasional use of reishi tea in food amounts is likely low-risk but not formally studied.
Adverse Effects
References
Monograph Sources
- [1] Wachtel-Galor S, Yuen J, Buswell JA, Benzie IFF. Ganoderma lucidum (Lingzhi or Reishi): A Medicinal Mushroom. In: Benzie IFF, Wachtel-Galor S, editors. Herbal Medicine: Biomolecular and Clinical Aspects. 2nd edition. Boca Raton (FL): CRC Press/Taylor & Francis (2011)
- [2] Anonymous (attributed to Shennong). Shennong Ben Cao Jing (Divine Farmer's Classic of Materia Medica). Original text ca. 200 CE; multiple modern translations and commentaries (200)
- [3] Boh B, Berovic M, Zhang J, Zhi-Bin L. Ganoderma lucidum and its pharmaceutically active compounds. Biotechnol Annu Rev (2007) ; 13 : 265-301 . DOI: 10.1016/S1387-2656(07)13010-6 . PMID: 17875480
Clinical Studies
- [4] Gao Y, Zhou S, Jiang W, Huang M, Dai X. Effects of Ganopoly (a Ganoderma lucidum polysaccharide extract) on the immune functions in advanced-stage cancer patients. Immunol Invest (2003) ; 32 : 201-215 . DOI: 10.1081/IMM-120022979 . PMID: 12916709
- [5] Cui XY, Cui SY, Zhang J, Wang ZJ, Yu B, Sheng ZF, Zhang XQ, Zhang YH. Extract of Ganoderma lucidum prolongs sleep time in rats. J Ethnopharmacol (2012) ; 139 : 796-800 . DOI: 10.1016/j.jep.2011.12.020 . PMID: 22207209
- [6] Tang W, Gao Y, Chen G, Gao H, Dai X, Ye J, Chan E, Huang M, Zhou S. A randomized, double-blind and placebo-controlled study of a Ganoderma lucidum polysaccharide extract in neurasthenia. J Med Food (2005) ; 8 : 53-58 . DOI: 10.1089/jmf.2005.8.53 . PMID: 15857210
- [7] Zhao H, Zhang Q, Zhao L, Huang X, Wang J, Kang X. Spore powder of Ganoderma lucidum improves cancer-related fatigue in breast cancer patients undergoing endocrine therapy: A pilot clinical trial. Evid Based Complement Alternat Med (2012) ; 2012 : 809614 . DOI: 10.1155/2012/809614 . PMID: 22203880
- [8] Jin X, Ruiz Beguerie J, Sze DM, Chan GC. Ganoderma lucidum (Reishi mushroom) for cancer treatment. Cochrane Database Syst Rev (2016) ; 4 : CD007731 . DOI: 10.1002/14651858.CD007731.pub3 . PMID: 27045603
- [9] Gao Y, Lan J, Dai X, Ye J, Zhou S. A phase I/II study of Ling Zhi mushroom Ganoderma lucidum (W.Curt.:Fr.) Lloyd (Aphyllophoromycetideae) extract in patients with type II diabetes mellitus. Int J Med Mushrooms (2004) ; 6 : 33-39 . DOI: 10.1615/IntJMedMushr.v6.i1.30
Traditional Texts
- [10] Lin ZB, Zhang HN. Anti-tumor and immunoregulatory activities of Ganoderma lucidum and its possible mechanisms. Acta Pharmacol Sin (2004) ; 25 : 1387-1395 . PMID: 15525457
Pharmacopeias & Reviews
- [11] National Pharmacopoeia Committee of China. Pharmacopoeia of the People's Republic of China, Volume I: Lingzhi (Ganoderma). China Medical Science Press, Beijing (2020)
Last updated: 2026-03-01 | Status: published
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