Shimeji (Hypsizygus tessellatus)
A popular culinary mushroom of Asian cuisine (bunashimeji/bunapishimeji), rich in beta-glucans and indole compounds — in vitro and animal studies suggest antioxidant and immunomodulatory effects.
Table of contents
TL;DR
A popular culinary mushroom of Asian cuisine (bunashimeji/bunapishimeji), rich in beta-glucans and indole compounds — in vitro and animal studies suggest antioxidant and immunomodulatory effects.
- →A rich source of beta-glucans among culinary mushrooms
- →A source of protein, dietary fiber, and potassium at low calorie content
- →Shows antioxidant and immunomodulatory activity in in vitro and animal studies
| Latin name | Hypsizygus tessellatus (syn. Hypsizygus marmoreus) |
|---|---|
| Family | Lyophyllaceae |
| Active compounds | Beta-1,3/1,6-glucans, tryptophan, ergothioneine, trace amounts of lovastatin |
| Form | Fresh mushroom clusters (brown bunashimeji or white bunapishimeji) |
| Level of evidence | Preliminary — in vitro and animal studies, no clinical trials in humans |
| Interactions | Theoretical caution with immunosuppressant drugs |
| Status | Edible mushroom, widely available in food retail |
Understand
Overview
Shimeji (Hypsizygus tessellatus, synonym: Hypsizygus marmoreus) is a cultivated mushroom that grows in clusters on beech and oak wood. Commercially it appears under a few names: the brown variety is called bunashimeji, the white one bunapishimeji; both belong to the same species and differ only in cap color.
It's worth distinguishing the shimeji sold in stores from the so-called 'true' hon-shimeji — a separate, wild-growing species, Lyophyllum shimeji. Bunashimeji is among the culinary mushroom species with the highest documented beta-glucan content.
Who can genuinely benefit from this, and who shouldn't expect much? Shimeji has one of the best-documented beta-glucan contents among culinary mushrooms, making it a sensible choice for anyone wanting to increase their intake of this type of fiber through an ordinary diet. More caution is warranted with reports of immunomodulatory effects and gut protection — this data comes from in vitro analyses and a single mouse study, with no clinical confirmation in humans whatsoever. People undergoing chemotherapy or with weakened immunity should not treat shimeji as a way to protect the gut — this is still a research hypothesis, not a proven intervention.
Where it's found
Hypsizygus tessellatus naturally occurs in East Asia (Japan, China), growing in clusters on the trunks of hardwood trees, especially beeches. Today it's grown commercially worldwide on substrates of sawdust and cereal bran.
History of use
Bunashimeji has been cultivated commercially in Japan since the 1970s and has long been a popular ingredient in Japanese cuisine. It's worth distinguishing it from the rare, wild-growing 'true' hon-shimeji (Lyophyllum shimeji), which is valued far more highly in Japan.
Mechanism of action
Bioactivity is attributed mainly to the high content of beta-1,3/1,6-glucans, which in in vitro and animal studies stimulate macrophage activity and increase cytokine production. The fruiting bodies also contain indole compounds (tryptophan, ergothioneine) with antioxidant activity. In a 2026 mouse study, the polysaccharides alleviated cisplatin-induced intestinal damage.
The immune system's recognition of beta-glucans occurs mainly via the Dectin-1 receptor on the surface of macrophages and dendritic cells — binding of beta-1,3-glucan activates the intracellular Syk kinase pathway, leading to NF-κB activation. In the mouse model study, the protective effect of the polysaccharides on the gut after cisplatin exposure was additionally linked to restoration of intestinal epithelial tight-junction proteins and changes in the microbiota favoring short-chain fatty acid production.
Beta-glucan intake
Shimeji provides some of the highest documented levels of beta-1,3/1,6-glucans among culinary mushrooms.
Recognition by the Dectin-1 receptor
Beta-glucans bind to the Dectin-1 receptor on macrophages and dendritic cells.
Activation of the Syk/NF-κB pathway
Leads to increased cytokine production and stimulation of the immune response.
Protection of the intestinal barrier
In a 2026 mouse study, the polysaccharides limited cisplatin-induced intestinal damage.
Evidence: early-stage — based on 2 studies in this database.
Benefits
Common myths
MythThe shimeji sold in stores is the same mushroom as the legendary Japanese 'hon-shimeji'.
FactIt's a different species — Hypsizygus tessellatus, grown commercially. True hon-shimeji is a wild, mycorrhizal species, Lyophyllum shimeji.
Forms & variants
Shimeji (Hypsizygus tessellatus) comes in several forms that differ in bioavailability and use case — the form you pick genuinely matters for how effective the supplementation is.
Bunashimeji (brown)
The darker, more full-flavored variety.
Best for: Soups, braised dishes, stir-fry
Bunapishimeji (white)
The lighter, milder-flavored variety of the same species.
Best for: Dishes calling for a subtler flavor
Practice
Frequently asked questions
No. What's sold as 'shimeji' in Europe is almost always Hypsizygus tessellatus. True hon-shimeji (Lyophyllum shimeji) is a rare, wild mycorrhizal mushroom.
Dosage & timing
Typical dose
As food: about 50–150 g of fresh mushrooms per serving, a few times a week
Form
Fresh mushroom clusters (brown bunashimeji or white bunapishimeji)
Treat shimeji as a valuable part of the diet, not a drug or formal supplementation regimen.
Best times to take it
- As a meal ingredient
- Always after cooking
What to combine with
Good combinations
Elm Oyster Mushroom (Hypsizygus ulmarius) — A mushroom from the same family (Lyophyllaceae)
Shiitake — A classic culinary pairing in Asian cuisine
Maitake (Hen of the Woods) — A frequent duo in one-pot dishes and soups
Safety
Side effects & contraindications
Possible side effects
Generally well tolerated as a dietary component
Raw or undercooked shimeji can cause gastrointestinal complaints
Contraindications
Mushroom allergy
Always eat thoroughly cooked
Interactions
Theoretical caution with immunosuppressant drugs
Is it worth taking?
Who it's for
- A rich source of beta-glucans among culinary mushrooms
- A source of protein, dietary fiber, and potassium at low calorie content
- Shows antioxidant and immunomodulatory activity in in vitro and animal studies
Not for
- Mushroom allergy
- Always eat thoroughly cooked
Evidence
Worth knowing
Contains some of the highest documented beta-glucan levels among culinary mushrooms.
Studies
In a mouse model, polysaccharides from Hypsizygus tessellatus alleviated intestinal damage caused by the chemotherapy drug cisplatin, improving the intestinal barrier and microbiota composition.
Abusidu M, et al., Frontiers in Nutrition, 2026
Hypsizygus marmoreus as a Source of Indole Compounds and Other Bioactive Substances
Early-stage evidenceKała K, et al. · Molecules · 2022
Analysis of the fruiting bodies found tryptophan, ergothioneine, lovastatin, and beta-glucans with potential antioxidant activity.
View studyHypsizygus marmoreus polysaccharides protect against cisplatin-induced intestinal mucositis
Early-stage evidenceAbusidu M, et al. · Frontiers in Nutrition · 2026
In a mouse model, polysaccharides alleviated cisplatin-induced intestinal damage, improving the intestinal barrier and microbiota composition.
View studySources & bibliography
Citations are illustrative for this demo version and require full bibliographic verification by the editorial team before production publication.
Compare with similar entries
About the authors of this entry
Author
Julia WiśniewskaEditor, Neurohacking & Sleep
Julia writes about nootropics, chronobiology and recovery protocols.
45 publications on this site
Medical review
dr Piotr ZielińskiEndocrinologist
Piotr reviews content on hormones, metabolic health and supplement pharmacology.
131 publications on this site
Related entries
4.2Elm Oyster Mushroom (Hypsizygus ulmarius)
A culinary mushroom closely related to shimeji, studied in the lab and in animals for antioxidant, hepatoprotective, and blood-sugar-supporting effects — with no clinical studies in humans.
3.9Hon-shimeji (Lyophyllum shimeji)
A wild-growing, mycorrhizal 'true shimeji' from Japan and Scandinavian pine forests — genetically and ecologically distinct from the cultivated bunashimeji sold under the same name.
4.3Shiitake
A culinary-functional mushroom rich in lentinan and beta-glucans, studied clinically for immune modulation and lipid profile — one of the best-researched functional mushrooms on the market.
4.1Maitake (Hen of the Woods)
A functional mushroom also known as 'Hen of the Woods,' studied mainly for immune modulation (D-fraction) in oncology and, more preliminarily, for carbohydrate metabolism — evidence in healthy people remains limited.
4.5Beta-glucans
Polysaccharides responsible for most of the documented immunomodulatory properties of medicinal mushrooms, oats, and barley — the common denominator behind dozens of species described in this knowledge base.
4.2Chaga (Birch Canker)
A hard, black growth found on birch trunks, traditionally brewed as a tea in Russia and Eastern Europe — today studied mainly for its exceptionally high content of antioxidant compounds.
4.1Chestnut Mushroom (Pholiota adiposa)
A culinary mushroom known in traditional Chinese and Korean medicine, with a relatively larger body of research into its polysaccharides' antioxidant and anticancer effects in vitro and in animal studies.
4.6High-Protein Diet
Increased protein intake is one of the best-documented ways to maintain satiety during weight loss and protect muscle mass — with no magic macronutrient ratios required.
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Comments (2)
- KW
Kasia W. 2 weeks ago
Very clearly explained, especially the interactions section — I hadn't seen it laid out this well anywhere else.
- MT
Marek T. a month ago
Are you planning to update this with the newest study from this year? I saw an interesting meta-analysis.