☯ TCM Properties
Tonifies Qi Deficiency, strengthens the Spleen, stimulates the appetite; Expel Wind and promotes eruptions; Resolves Phlegm and regulates the flow of Qi; Removes toxicity and treats cancer
Traditional Chinese Uses
Xiang Gu is the shiitake mushroom, Lentinula edodes, classed among the tonifying substances. Sweet and neutral, entering the Liver and Stomach (and Spleen) channels, it tonifies Qi and strengthens the Spleen and Stomach to stimulate appetite and support the body's resistance, and has long been eaten as a strengthening food-medicine for deficiency and to "resist aging." It is also said to vent Wind and promote the eruption of measles, transform Phlegm and regulate Qi, and resolve toxicity, and is used adjunctively in modern Chinese oncology.
As a gentle, food-grade tonic it is well tolerated and suited to convalescence and general Qi weakness, commonly taken simply as food or in soups. Its principal researched constituent, the beta-glucan lentinan, is used as an immune-modulating adjunct to cancer therapy, consistent with the traditional "tonify Qi, resolve toxicity" reading.
Western Herbalism Properties
Botanical Description
Xiang Gu is the shiitake mushroom, Lentinula edodes (Berk.) Pegler (Omphalotaceae), a saprotrophic basidiomycete native to East Asia and cultivated for over a millennium on hardwood logs of Quercus, Castanea, and Castanopsis. The fruiting body bears a convex to plano-convex cap 5-12 cm in diameter, dry, smooth to scaly, ranging in color from pale tan to dark brown, often cracking in cold weather to reveal white flesh and yielding the prized 'donko' grade. The gills are white, crowded, and notched at the stipe, which is firm, fibrous, and centrally to off-centrally attached. Long valued as food and medicine in China, Japan, and Korea, shiitake is documented in Wu Rui's 1313 Ri Yong Ben Cao as a qi-tonifying food. Polysaccharides (lentinan, eritadenine) have demonstrated immunomodulatory and cholesterol-lowering activity.
Active Constituents
Lentinan
β-(1→3),(1→6)-D-glucan (high-MW polysaccharide)Concentration: Principal bioactive polysaccharide of the fruiting body; extracted and purified for clinical use
A triple-helical β-glucan that acts as a biological response modifier. It binds pattern-recognition receptors (Dectin-1, TLRs, complement receptor 3) on macrophages, NK cells and T cells, activating MAPK/NF-κB/Syk-PKC signalling and enhancing anti-tumour immunity. Used clinically (often intravenously) as an adjuvant to chemotherapy.
Eritadenine (lentysine)
Purine alkaloid derivativeConcentration: Present in the fruiting body
A hypocholesterolaemic compound that accelerates cholesterol metabolism and lowers plasma cholesterol by modulating hepatic phospholipid metabolism; underlies the reputed cardiovascular/lipid benefits of shiitake.
Ergosterol (provitamin D2)
SterolConcentration: Major sterol of the mushroom; converts to vitamin D2 on UV exposure
Provitamin D2 precursor; UV-treated shiitake is a notable dietary source of vitamin D2. Also contributes antioxidant sterol content.
Lenthionine
Cyclic polysulfide (organosulfur)Concentration: Characteristic aroma compound formed enzymatically
Responsible for the distinctive shiitake aroma; shows antimicrobial and antiplatelet activity in vitro.
L-Ergothioneine
Thiol-histidine antioxidant amino acidConcentration: Shiitake is among the richest dietary sources
A potent cellular antioxidant that accumulates in tissues and protects against oxidative stress.
Dietary fibre / β-glucan complex
Polysaccharide fibreConcentration: High proportion of the dried fruiting body
Supports gut and immune function and contributes to the tonifying, appetite-supporting actions attributed to the herb.
⚠ Drug Interactions
Immunosuppressant drugs (e.g. ciclosporin, tacrolimus, corticosteroids)
Lentinan is an immunostimulant/biological response modifier that activates macrophages, NK cells and T-cell responses, which could theoretically oppose the intended action of immunosuppressive therapy. No clinical interaction reports exist for dietary shiitake.
Clinical note: Caution with concentrated lentinan supplements in transplant or autoimmune patients on immunosuppressants; culinary amounts are generally regarded as safe.
Anticoagulant/antiplatelet drugs
Lenthionine and other shiitake constituents show antiplatelet activity in vitro, so high supplemental intake could theoretically add to the effect of antiplatelet/anticoagulant agents.
Clinical note: No documented clinical bleeding events from dietary intake; monitor if using concentrated extracts with warfarin or antiplatelet drugs.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| decoction | 9-30g | Daily | — | — | — |
Preparation Methods
Culinary use / food-as-medicine
Parts: Fruiting body (fresh or dried)
Rehydrated dried caps or fresh mushrooms are cooked in soups and dishes to tonify Qi, strengthen the Spleen and stimulate the appetite. Dietary intake of 5–10 g dried daily was used in the immune study.
Hot-water decoction / extract
Parts: Dried fruiting body
Prolonged hot-water extraction releases the water-soluble β-glucan (lentinan) fraction; used as a tonic broth or as the basis for concentrated polysaccharide extracts.
Purified lentinan (pharmaceutical injection)
Parts: Fruiting body (purified polysaccharide)
In clinical oncology settings, purified lentinan is administered parenterally (commonly intravenously, roughly 1–2 mg doses) as an adjuvant to chemotherapy — a medical preparation, not a home remedy.
UV-exposed dried mushroom (vitamin D enrichment)
Parts: Fruiting body
Exposing gill-side up dried shiitake to sunlight/UV converts ergosterol to vitamin D2, markedly raising its vitamin D content.
Clinical Studies
Consuming Lentinula edodes (Shiitake) Mushrooms Daily Improves Human Immunity: A Randomized Dietary Intervention in Healthy Young Adults
Fifty-two healthy adults consumed 5 or 10 g of dried shiitake daily for 4 weeks. Consumption increased γδ T-cell and NK-T-cell proliferation and secretory IgA, and reduced C-reactive protein, indicating improved cell-mediated and mucosal immunity with reduced inflammation.
Individual patient based meta-analysis of lentinan for unresectable/recurrent gastric cancer
Pooled individual patient data from 5 randomized trials (650 patients) showed that adding lentinan to chemotherapy significantly prolonged overall survival in advanced/recurrent gastric cancer (HR 0.80, 95% CI 0.68–0.95; stratified log-rank p=0.011), with greater benefit suggested in patients with lymph-node metastasis.
Historical Texts
Ri Yong Ben Cao (Materia Medica for Daily Use), Wu Rui
Yuan–early Ming dynasty, 14th centuryNong Shu (Book of Agriculture), Wang Zhen
Yuan dynasty, 1313Bencao Gangmu (Compendium of Materia Medica), Li Shizhen
Ming dynasty, 1578References
- Dai X, Stanilka JM, Rowe CA, et al.. Consuming Lentinula edodes (Shiitake) Mushrooms Daily Improves Human Immunity: A Randomized Dietary Intervention in Healthy Young Adults . Journal of the American College of Nutrition (2015) [DOI]
- Memorial Sloan Kettering Cancer Center (Integrative Medicine). Lentinan — About Herbs, Botanicals & Other Products . MSKCC Integrative Medicine monograph (2023) [DOI]
This information is for educational purposes only and is not intended to replace professional medical advice. Always consult a qualified healthcare provider before using any herbal remedy, especially if you are pregnant, nursing, or taking medications.
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