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Shiitake Mushrooms: What is Lentinula edodes, and what can it really do?
The second most cultivated edible mushroom in the world. Approved as a medicine in Japan. Used as a medicinal food in Asia for over 2,000 years. In Europe, however, Shiitake is perceived almost exclusively as a cooking ingredient — and when it is used as a dietary supplement, it is usually without any indication of the active ingredients that truly make it valuable.
Shiitake is a special case among medicinal mushrooms. Its most famous active ingredient — Lentinan — is the only active ingredient derived from a medicinal mushroom that is approved in Japan as a pharmaceutical adjuvant in cancer therapy.
What is the Shiitake mushroom? Botany, history, and names
Shiitake (Lentinula edodes, formerly Lentinus edodes) is a basidiomycete from the family Omphalotaceae. It grows on hardwood logs — especially chestnut, oak, hornbeam, and beech. The Japanese name: shii (Japanese chestnut) + take (mushroom).
The term Shiitake edodes in search queries is a shortened form of Lentinula edodes — the currently valid taxonomic name. Both terms refer to the same species.
Active ingredients of Shiitake
- Lentinan: the most studied beta-1,3-glucan among medicinal mushrooms. Approved in Japan as an injectable pharmaceutical adjuvant in oncological chemotherapy.
- Eritadenine: an adenosine analog found almost exclusively in shiitake among edible mushrooms. Supports cholesterol metabolism through a different mechanism than statins.
- Lenthionine and sulfur-containing compounds: responsible for the characteristic aroma, with documented antimicrobial activity.
- Total polysaccharides: antioxidant, immunomodulatory, and prebiotic effect on the gut microbiome.
- Ergosterol (provitamin D2): precursor to vitamin D2. Sun-dried shiitake contains significantly more vitamin D than that cultivated under artificial light.
- Vitamin B12: in small amounts, relevant for people on a plant-based diet.
- Selenium, zinc, copper, manganese: one of the most complete mineral profiles among edible mushrooms.
Effect on immunity: the human RCT study
The most significant data on Shiitake research is a randomized controlled trial, published in the Journal of the American College of Nutrition in 2015 (Dai et al.). It evaluated the effect of whole Shiitake mushroom — not extract — in 52 healthy adults (21–41 years) over 4 weeks. Results with only 5–10 g dry mushroom per day:
- Proliferation of γδ-T-cells increased by 60% (p < 0.0001)
- Proliferation of NK-T-cells doubled (p < 0.0001)
- Both cell populations showed higher activation receptor expression
- Increase in secretory IgA in saliva — marker of improved mucosal immunity
- Reduction of C-reactive protein (CRP) — systemic inflammation marker
Lentinan as an approved drug
In Japan, injectable Lentinan is approved as an immunotherapeutic adjuvant for advanced gastric cancer in combination with chemotherapy. Clinical studies have documented improvements in survival compared to chemotherapy alone. A systematic overview of the immunomodulatory properties of Lentinula edodes polysaccharides (Kozarski et al., 2022) details these effects. (PMC9409024)
Important note: This information concerns injectable Lentinan in a clinical setting, not oral dietary supplements. Oral extracts show immunomodulatory properties but are not to be equated with pharmaceutical indications.
Eritadenine and cholesterol metabolism
Eritadenine is responsible for the cholesterol-lowering effect of Shiitake documented in animal and initial human studies. The mechanism — modulation of the homocysteine transporter (BHMT) — differs from statins and is the subject of active research as a potential therapeutic target in metabolic syndrome.
Contraindications: Shiitake dermatitis
Flagellate Dermatitis from raw Shiitake: A skin inflammation with linear red streaks and itching that can occur 24–48 hours after consuming raw or incompletely cooked Shiitake. It is attributed to naturally occurring Lentinan. Complete cooking inactivates the responsible Lentinan.
Other situations requiring caution:
- Anticoagulant therapy (warfarin, DOAC): possible antiplatelet effect.
- Pregnancy and breastfeeding: insufficient safety data for concentrated extracts.
- Autoimmune diseases with immunosuppressive therapy: possible interference.
- Impending surgery: Discontinue at least 2 weeks before the procedure.
- Very high fiber intake: rare digestive discomfort; isolated cases of intestinal obstruction described.
Fresh mushroom vs. extract: What's the difference?
Fresh or dried mushroom: The RCT by Dai et al. achieved significant immune effects with only 5–10 g of dried mushroom daily — an amount that can be easily integrated into the diet. Anyone who regularly cooks and eats shiitake already benefits from some of the documented advantages.
Standardized dry extract: allows for a reproducible dose of Lentinan and total polysaccharides, stated on the label — independent of the variability of fresh mushrooms.
How long does it take for Shiitake to work?
- Immune response (γδ-T cells, NK-T cells, CRP): statistically significant changes already after 4 weeks (Dai et al., 2015).
- Mucosal immunity (IgA): Improvement after 4 weeks.
- Cholesterol metabolism (Eritadenine): Observational data suggest at least 6–8 weeks.
How to recognize a high-quality Shiitake extract?
- Lentinan or polysaccharide titration: At least 20–30% declared. Missing declaration = not standardized.
- Fruiting body or mycelium: The fruiting body is the main source of Lentinan in the highest concentrations.
- No unnecessary additives: no magnesium stearate.
- HPMC capsule: plant-based.
- European manufacturing with traceability of raw materials.
Would you like to try Shiitake as a standardized dry extract, free from unnecessary additives?
Discover Shiitake Oravita by RedMoringa — Lentinula edodes extract with certified Lentinan and polysaccharides, HPMC capsules, made in Italy.
To the productSources
- Dai X et al. (2015). Consuming Lentinula edodes (Shiitake) Mushrooms Daily Improves Human Immunity. J Am Coll Nutr. PubMed: 25866155
- Kozarski M et al. (2022). Immunomodulatory Properties of Polysaccharides from Lentinula edodes. Int J Mol Sci. PMC9409024
- Finimundy TC et al. (2024). Lentinula edodes as Multicomponent Medicinal Mixture. Pharmaceuticals. PMC10890338
- Risoli S et al. (2023). Mushroom-Based Supplements in Italy: Let's Open Pandora's Box. Nutrients. DOI: 10.3390/nu15030776
This content is for informational purposes only and does not replace medical advice. Please consult your doctor or pharmacist before use.
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