Shiitake
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.
Number of studies
2
Safety
Requires caution
Time to effects
Changes in selected immune parameters were observed after about 4 weeks of daily consumption; lipid effects were assessed after about 66 days of use.
Monthly cost
ok. 60–100 zł/miesiąc (forma ekstraktu)
Price in Poland
15–20 zł za 50 g suszonych owocników; 60–100 zł za 90 kapsułek ekstraktu
Who it's for
Cena rośnie wraz ze standaryzacją procentową polisacharydów/beta-glukanów
Indicative prices for the Polish market — we don't point to specific retailers; the real price depends on the manufacturer, form and place of purchase.
Table of contents
TL;DR
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.
- →Daily consumption of 5–10 g of dried fruiting bodies for 4 weeks increased the proliferation and activity of NK-T cells and γδ-T lymphocytes and lowered CRP in healthy adults
- →A randomized trial using shiitake bars observed a drop in triglycerides and improved oxidative stress markers in people with borderline elevated cholesterol
- →High beta-glucan content makes shiitake one of the most frequently studied mushrooms for modulating innate and adaptive immunity
| Latin name | Lentinula edodes |
|---|---|
| Family | Omphalotaceae (order Agaricales) |
| Active compounds | Lentinan (beta-1,3/1,6-glucan), eritadenine, ergosterol (provitamin D2) |
| Form | Dried fruiting bodies, powder, standardized extract in capsules |
| Level of evidence | Moderate — clinical trials (RCTs) in humans; purified lentinan registered in Japan as an injectable drug |
| Interactions | Immunosuppressants, anticoagulant/antiplatelet drugs, statins |
| Status | Approved as food; extracts sold in Poland as a dietary supplement, not a drug |
Understand
Overview
Shiitake (Lentinula edodes) is an edible mushroom native to East Asia, cultivated for centuries in Japan, China, and Korea on hardwood logs. In Poland it's sold almost exclusively under its Japanese trade name 'shiitake' — fresh and dried, as well as standardized capsule extracts.
Shiitake is among the most intensively studied functional mushrooms in the world, largely thanks to lentinan — a beta-1,3/1,6-glucan polysaccharide that in Japan is a registered drug administered intravenously as adjunct oncology therapy. Separate from this clinical form, oral consumption of the fruiting body and standardized extracts has been studied for effects on cellular immunity and lipid profile in healthy and partly metabolically burdened adults, with results pointing to modest but reproducible effects.
From a practical standpoint, shiitake will most realistically help healthy people looking for gentle, long-term dietary immune support — daily consumption of dried fruiting bodies for 4 weeks improved selected cellular and mucosal immunity parameters in healthy young adults. Similarly, people with borderline elevated cholesterol can expect modest, complementary support for their lipid profile — but only as an addition to, not a replacement for, standard treatment. Shiitake, however, will not help people expecting the therapeutic effect known from injectable lentinan used in oncology — that's an entirely different form, dose, and route of administration than the dried fruiting bodies or capsules available to consumers.
Where it's found
Shiitake's natural habitat is the trunks of dead and dying hardwood trees (oak, chestnut, beech) in the humid forests of East Asia — Japan, China, and Korea. Today the mushroom is grown commercially worldwide, traditionally on hardwood logs, and industrially on sawdust substrates.
History of use
Documented shiitake cultivation in China dates back to the Song dynasty (roughly the 13th century), and in Japan the traditional log-cultivation method ('hodakagi') developed during the Edo period. For centuries the mushroom has been a staple of Chinese and Japanese cuisine and medicine, valued as natural immune support.
Mechanism of action
The main studied component is lentinan — a large-molecule beta-glucan that stimulates macrophages, NK cells, and T and B lymphocytes through interaction with pattern-recognition receptors (including dectin-1). In human studies, daily consumption of fruiting bodies increased the proliferation and effector capacity of γδ-T and NK-T lymphocytes and raised secretory IgA levels. A second important mechanism is the action of eritadenine — a compound present in fruiting bodies that affects methionine and cholesterol metabolism, partly explaining the drop in triglycerides observed in clinical studies.
At the molecular level, lentinan is recognized primarily by the dectin-1 receptor (CLEC7A) on the surface of macrophages and dendritic cells, partly with the involvement of the TLR-2 receptor as well — this combination initiates a signaling cascade leading to activation of the transcription factor NF-κB. Eritadenine, meanwhile, works through a different pathway — as an adenine nucleoside analog it inhibits S-adenosylhomocysteine (SAH) hydrolase activity, disrupting the methionine methylation cycle, which in turn changes the ratio of phosphatidylcholine to other phospholipids in the liver, indirectly affecting the rate at which cholesterol and LDL are cleared from circulation.
Lentinan binding to the dectin-1 receptor
Lentinan's beta-1,3/1,6-glucan is recognized by the dectin-1 receptor (and partly TLR-2) on macrophages and dendritic cells.
Activation of NK-T cells and γδ-T lymphocytes
Signaling through NF-κB leads to increased proliferation and effector capacity of NK-T cells and γδ-T lymphocytes.
Rise in sIgA and drop in CRP
The end result of cellular activation is a rise in secretory IgA and a drop in CRP after about 4 weeks of daily consumption.
Eritadenine and lipid metabolism
In parallel, eritadenine inhibits SAH hydrolase, altering hepatic phospholipid metabolism and supporting cholesterol clearance from circulation.
Evidence: moderate — based on 2 studies in this database.
Benefits
Common myths
MythRaw shiitake is healthier than cooked.
FactRaw or undercooked fruiting bodies contain heat-labile lentinan, which can trigger the characteristic flagellate dermatitis (shiitake dermatitis). Thorough cooking neutralizes this effect.
MythShiitake supplements cure cancer.
FactThe purified, injectable form of lentinan is a registered adjunct chemotherapy drug in Japan, but the capsules and oral extracts available to consumers have no proven anticancer effect.
Forms & variants
Shiitake comes in several forms that differ in bioavailability and use case — the form you pick genuinely matters for how effective the supplementation is.
Dried fruiting bodies / powder
The most natural form, used culinarily and as a base for homemade broths
Best for: People wanting to add shiitake to their diet in culinary form
Standardized extract (capsules)
Concentrated extract from the fruiting bodies, standardized for polysaccharide/beta-glucan content
Best for: People looking for a convenient, standardized supplement form
Lentinan (injectable form)
A purified polysaccharide fraction registered in Japan as an adjunct oncology drug — available only in clinical settings
Best for: Clinical use only, under a doctor's supervision; not applicable to consumer supplements
Practice
Frequently asked questions
This isn't recommended. Raw or undercooked fruiting bodies contain heat-labile lentinan, which in some people triggers a characteristic, itchy flagellate rash (shiitake dermatitis). Thorough cooking eliminates this risk.
A clinical trial showed a beneficial effect on triglycerides and oxidative stress markers in people with borderline elevated cholesterol after about 66 days of use. The effect is modest and doesn't replace pharmacological treatment.
In the study, just 5–10 g of dried fruiting bodies daily for 4 weeks was associated with improvement in selected cellular and mucosal immunity parameters.
Dosage & timing
Typical dose
5–10 g of dried fruiting bodies daily (after cooking), or 500–1500 mg of standardized extract (10–40% polysaccharides) daily
Form
Dried fruiting bodies, powder, capsule extract
Dosage information is provided for reference and reflects the ranges used in the cited studies — it does not replace consultation with a doctor or pharmacist.
Best times to take it
- With a meal — for better gastric tolerance
- Always after thorough cooking (a minimum of a few minutes at high temperature) — never raw
What to combine with
Good combinations
Lion's Mane — A frequent combination in functional mushroom blends supporting immunity and overall condition
Cordyceps militaris — Complementary action profiles — immunity (shiitake) and endurance (cordyceps)
Safety
Side effects & contraindications
Possible side effects
Generally well tolerated once thoroughly cooked
Shiitake dermatitis (so-called flagellate dermatitis) — an itchy, linear rash appearing about 24–48h after eating raw or undercooked fruiting bodies; affects an estimated 2% of consumers and resolves on its own
Rarely: nausea, gastrointestinal complaints
Rarely: allergic reactions in people allergic to mushrooms
Contraindications
Mushroom allergy
Autoimmune diseases — caution advised due to potential immune-stimulating effects
Planned surgery — discontinuation about 2 weeks beforehand is recommended
Pregnancy and breastfeeding — insufficient data on concentrated extracts
Interactions
Immunosuppressants — theoretical weakening of drug effect
Anticoagulant/antiplatelet drugs — theoretical risk of enhanced effect
Statins and other cholesterol-lowering drugs — possible additive effect on lipid profile requiring monitoring
Is it worth taking?
Who it's for
- People looking for natural dietary immune support
- People with borderline elevated cholesterol interested in additional dietary support (not a replacement for treatment)
Not for
- Mushroom allergy
- Autoimmune diseases — caution advised due to potential immune-stimulating effects
- Planned surgery — discontinuation about 2 weeks beforehand is recommended
- Pregnancy and breastfeeding — insufficient data on concentrated extracts
Evidence
Worth knowing
Lentinan isolated from shiitake is a registered intravenous drug in Japan used as an adjunct to chemotherapy — an entirely different form and dose than popular oral supplements
Sun-drying the fruiting bodies (gills facing up) significantly increases vitamin D2 content thanks to UV radiation acting on ergosterol
Studies
Consuming 5 or 10 g of dried shiitake daily for 4 weeks increased proliferation of γδ-T and NK-T cells, raised sIgA levels, and lowered CRP in healthy adults.
Dai X, et al., Journal of the American College of Nutrition, 2015
Consuming Lentinula edodes (Shiitake) Mushrooms Daily Improves Human Immunity: A Randomized Dietary Intervention in Healthy Young Adults
Moderate evidenceDai X, Stanilka JM, Rowe CA, Esteves EA, Nieves C Jr, Spaiser SJ, Christman MC, Langkamp-Henken B, Percival SS · Journal of the American College of Nutrition · 2015
A randomized trial in 52 healthy adults showed that consuming 5 or 10 g of dried shiitake daily for 4 weeks increased proliferation of γδ-T and NK-T cells, raised sIgA levels, and lowered CRP.
View studyEffects of Shiitake Culinary-Medicinal Mushroom Bars on Lipid and Antioxidant Profiles in Individuals with Borderline High Cholesterol: A Double-Blind Randomized Clinical Trial
Moderate evidenceSpim SRV, Pistila AMH, Pickler TB, Silva MT, Grotto D · International Journal of Medicinal Mushrooms · 2021
A randomized, double-blind trial in 68 people with borderline elevated cholesterol showed that shiitake bars used for 66 days lowered triglycerides and improved oxidative stress markers versus placebo.
View studySources & bibliography
- Memorial Sloan Kettering Cancer Center — Shiitake Mushroom
- DermNet NZ — Shiitake flagellate dermatitis
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
Michał NowakClinical Dietitian
Michał specializes in metabolic nutrition, intermittent fasting and sports supplementation.
61 publications on this site
Medical review
dr Piotr ZielińskiEndocrinologist
Piotr reviews content on hormones, metabolic health and supplement pharmacology.
131 publications on this site
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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.