Shiitake
Lentinula edodes
TL;DR
Shiitake's injectable beta-glucan has real oncology data in Japan; the oral supplement mostly shows immune-marker shifts, not proven clinical benefit.
Ideal For
- People wanting a food-first immune and gut-microbiome support
- Those seeking a nutrient-dense culinary mushroom
Avoid If
- You have a mushroom allergy
- You have an eosinophilic disorder
Frequently Asked Questions
Overview
Lentinan, a purified beta-1,3-glucan from Lentinula edodes, is approved in Japan as an intravenous adjuvant to chemotherapy in gastric cancer, where meta-analyses of Japanese trials report modest survival gains. That evidence does not transfer to oral capsules: swallowed beta-glucans are not absorbed intact and act on gut-associated lymphoid tissue instead. Small human studies of daily shiitake consumption report increased secretory IgA, altered cytokine profiles, and improved gut bacterial diversity — biologically interesting, but not tied to fewer infections or other hard endpoints. Eritadenine, a purine alkaloid unique to shiitake, lowers cholesterol in animals through altered phospholipid metabolism, with only weak human confirmation. A distinctive adverse effect is shiitake dermatitis, a flagellate rash caused by lentinan in raw or undercooked mushrooms, which resolves with cooking. Shiitake is a nutritious food with plausible immune effects; the supplement industry's claims run well ahead of the trials.
How It Works
- Beta-1,3/1,6-glucans bind dectin-1 receptors on gut immune cells
- Lentinan stimulates T-helper and NK cell activity in preclinical models
- Eritadenine alters hepatic phospholipid metabolism, lowering cholesterol in animals
- Prebiotic fiber content supports short-chain fatty acid production
Health Concerns Addressed
No linked health concerns yet.
Supporting Research5 studies
Consuming Lentinula edodes (Shiitake) Mushrooms Daily Improves Human Immunity: A Randomized Dietary Intervention in Healthy Young Adults
Dai X, Stanilka JM, Rowe CA +6 more
Four weeks of daily shiitake consumption increased gamma delta T-cell proliferation and secretory IgA while reducing C-reactive protein in healthy young adults.
Modulation of human intestinal microbiota in a clinical trial by consumption of a beta-D-glucan-enriched extract obtained from Lentinula edodes
Morales D, Shetty SA, Lopez-Plaza B +4 more
A shiitake beta-glucan extract shifted gut microbiota composition and short-chain fatty acid producers in hyperlipidaemic adults without major lipid changes.
Lentinula edodes mycelia extract plus adjuvant chemotherapy for breast cancer patients: results of a randomized study on host quality of life and immune function improvement
Suzuki N, Takimoto Y, Suzuki R +5 more
Lentinula edodes mycelia extract alongside adjuvant chemotherapy improved quality of life scores and some immune parameters.
Evaluation of host quality of life and immune function in breast cancer patients treated with adjuvant chemotherapy plus oral administration of Lentinula edodes mycelia extract
Nagashima Y, Maeda N, Yamamoto S +2 more
Patients receiving the mycelia extract reported less chemotherapy-related fatigue and maintained natural killer cell activity better than controls.
Beta-glucans in higher fungi and their health effects
Rop O, Mlcek J, Jurikova T
Fungal beta-glucans including lentinan from shiitake show immunomodulatory and cholesterol-lowering activity in experimental and early clinical work.
Safety Information
Potential Side Effects
{"Shiitake dermatitis (flagellate rash) from raw mushrooms; bloating; eosinophilia at high doses"}
Contraindications
{"Mushroom allergy"}
Drug Interactions
- Possible additive effects with immunosuppressants
- Theoretical interaction with anticoagulants
Pregnancy & Breastfeeding
Pregnancy: likely_safe
Breastfeeding: likely_safe
Dosage Guidelines
Dosage Used in Studies
Consult healthcare provider
Forms Compared
Food & Timing
With meals; cooking prevents shiitake dermatitis.
Medical Disclaimer
The information provided on this website is for educational and informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or before starting any supplement regimen.
Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.