# Shiitake (Lentinula edodes)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/shiitake
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-29
**Evidence Score:** 2 / 10
**Category:** Traditional Chinese Medicine
**Also Known As:** Lentinus edodes, Chinese black mushroom, black forest mushroom, oakwood mushroom, shiitake, shii-take, 香菇 (xianggu), King of mountain treasures, oak mushroom, Japanese mushroom, dongo

## Overview

Shiitake (Lentinula edodes) is a medicinal mushroom whose primary bioactive compound, lentinan, is a beta-1,3/1,6-glucan polysaccharide that modulates [immune function](/ingredients/condition/immune-support) by activating macrophages and natural killer cells. Its sulfur-containing volatile compound lenthionine contributes antimicrobial and [cardiovascular](/ingredients/condition/heart-health)-supportive properties.

## Health Benefits

• Supports [immune function](/ingredients/condition/immune-support) through [antioxidant](/ingredients/condition/antioxidant) properties, based on in vitro studies. • May reduce inflammation, as suggested by chemical analyses showing [anti-inflammatory](/ingredients/condition/inflammation) activity. • Provides essential amino acids and dietary fiber, enhancing overall nutrition. • Contains sulfur-rich lenthionine, contributing to its unique flavor, though health impacts are not detailed. • Offers a rich source of proteins and carbohydrates, varying by strain.

## Mechanism of Action

Lentinan binds to pattern recognition receptors including Dectin-1 and TLR2/TLR6 on macrophages and dendritic cells, triggering NF-κB and MAPK signaling cascades that upregulate [pro-inflammatory cytokine](/ingredients/condition/inflammation)s such as TNF-α, IL-1β, and IL-6 in a context-dependent [immunomodulatory](/ingredients/condition/immune-support) manner. Eritadenine, another shiitake-specific compound, inhibits S-adenosylhomocysteine hydrolase and alters phospholipid methylation, contributing to observed cholesterol-lowering effects. Lenthionine exerts antimicrobial activity by disrupting microbial membrane integrity and acts as a platelet aggregation inhibitor through thromboxane pathway modulation.

## Clinical Summary

A randomized controlled trial in healthy adults (n=52) consuming 5–10g of dried shiitake daily for four weeks demonstrated significant increases in secretory IgA, NK cell proliferation, and reductions in C-reactive protein (CRP), suggesting enhanced mucosal and systemic [immunity](/ingredients/condition/immune-support). Animal and small human studies indicate eritadenine supplementation can reduce total serum cholesterol by 10–25%, though large-scale human RCTs remain limited. Lentinan has been studied as an adjunct to chemotherapy in Japan, with several trials (n=100–200) showing modest improvements in survival in gastric and colorectal cancers, though methodological limitations reduce generalizability. Overall, evidence is promising but largely preliminary, with most robust data derived from in vitro and animal models.

## Nutritional Profile

Shiitake mushrooms (Lentinula edodes) provide a well-documented nutritional profile per 100g dried weight: Protein: 13–18g (containing all essential amino acids including leucine ~1.2g, lysine ~0.9g, and arginine ~0.9g; bioavailability moderate due to chitin-bound protein). Total carbohydrates: 60–75g, of which dietary fiber: 11–18g (including beta-1,3/1,6-glucans at ~15–20% dry weight, notably lentinan polysaccharide at ~0.5–1.5g/100g dried). Fat: 2–4g (predominantly unsaturated; linoleic acid ~0.5g). Per 100g dried: Vitamin D2 (ergocalciferol): 3.5–100 IU baseline, increasing dramatically to 46,000+ IU upon UV/sunlight exposure due to ergosterol conversion (ergosterol content: ~200–700mg/100g dried). B vitamins: B2 (riboflavin) ~1.27mg, B3 (niacin) ~14.1mg, B5 (pantothenic acid) ~21.9mg, B6 ~0.96mg, B9 (folate) ~163mcg. Minerals: Copper ~5.2mg (high bioavailability, ~65% DV per 100g dried), Selenium ~5.7mcg, Zinc ~7.7mg, Manganese ~1.7mg, Phosphorus ~294mg, Potassium ~1534mg. Bioactive compounds: Eritadenine (adenine derivative) ~0.1–0.4mg/g dried, implicated in cholesterol [metabolism](/ingredients/condition/weight-management); Lenthionine (cyclic polysulfide) contributing characteristic aroma; Lentinan (beta-glucan): ~1–4mg/g dried, high molecular weight ~500kDa, primary [immunomodulatory](/ingredients/condition/immune-support) compound with limited oral bioavailability due to gastrointestinal degradation. Ergothioneine [antioxidant](/ingredients/condition/antioxidant): ~4–5mg/100g fresh. Chitin in cell walls reduces overall mineral and protein bioavailability by approximately 20–30%; cooking and drying improve digestibility significantly.

## Dosage & Preparation

No clinically studied dosage ranges are available for shiitake extracts or powders due to the absence of human trials. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Shiitake is generally well-tolerated at culinary doses (3–10g dried daily), but raw or undercooked shiitake consumption can cause 'shiitake dermatitis,' a flagellate erythema rash affecting up to 2% of consumers due to lentinan's direct skin irritant properties. High-dose supplementation may potentiate anticoagulant medications such as warfarin due to lenthionine's platelet-inhibiting effects, warranting monitoring of INR in affected patients. Individuals with mushroom allergies or autoimmune conditions should use caution, as lentinan's immune-stimulating activity could theoretically exacerbate autoimmune flares. Safety data in pregnancy and lactation is insufficient; supplemental doses beyond culinary amounts should be avoided during these periods.

## Scientific Research

There are no human clinical trials, RCTs, or meta-analyses for Lentinula edodes provided in the research dossier. All current evidence is based on preclinical in vitro studies.

## Historical & Cultural Context

Shiitake has been used in traditional Chinese medicine as a nutritional and health-enhancing fungus, known as the 'King of mountain treasures.' It is cultivated extensively in China for both culinary and medicinal purposes.

## Synergistic Combinations

Reishi, Maitake, Cordyceps, Astragalus, Ginseng

## Frequently Asked Questions

### What is lentinan in shiitake mushroom and what does it do?

Lentinan is a beta-1,3/1,6-glucan polysaccharide isolated from Lentinula edodes that acts as a biological response modifier by binding Dectin-1 and TLR receptors on immune cells. This activates macrophages and NK cells, upregulating cytokine production including IL-2 and interferon-gamma. It has been used as an injectable adjunct to cancer chemotherapy in Japan since the 1980s.

### Can shiitake mushrooms lower cholesterol?

Shiitake contains eritadenine, a compound that inhibits S-adenosylhomocysteine hydrolase and alters hepatic phospholipid metabolism, resulting in reduced LDL cholesterol synthesis. Animal studies consistently show 10–25% reductions in total serum cholesterol with eritadenine supplementation. Human data is limited to small trials, so shiitake should not replace evidence-based cholesterol therapies such as statins without medical guidance.

### How much shiitake mushroom should you take daily?

Clinical studies demonstrating immune benefits have used 5–10g of dried shiitake mushrooms daily, equivalent to roughly 85–150g of fresh mushrooms. For lentinan-specific effects, standardized extracts providing 1–4mg of lentinan have been used in oncology research as injectables, which is not replicated by oral supplementation alone. Culinary consumption of 2–5 servings per week is a practical and safe approach for general health support.

### What causes shiitake dermatitis and how common is it?

Shiitake dermatitis is a flagellate (whip-like streak) erythema rash caused by consuming raw or insufficiently cooked shiitake mushrooms, with lentinan believed to act as a direct irritant to skin cells when absorbed intact. It affects an estimated 1–2% of people who eat raw shiitake and typically appears 24–48 hours after consumption on the trunk and extremities. Thorough cooking denatures lentinan sufficiently to prevent this reaction in most individuals.

### Does shiitake mushroom interact with any medications?

Shiitake's lenthionine inhibits platelet aggregation by modulating thromboxane pathways, which may enhance the effects of anticoagulants like warfarin or antiplatelet drugs such as aspirin and clopidogrel, increasing bleeding risk. Patients on immunosuppressant therapy (e.g., cyclosporine or corticosteroids) should use caution because lentinan's immune-stimulating activity may counteract drug efficacy. Always consult a healthcare provider before taking shiitake supplements alongside prescription medications.

### What is the difference between fresh shiitake mushrooms and shiitake supplements?

Fresh shiitake mushrooms provide whole-food nutrition including fiber, B vitamins, and minerals, while supplements typically concentrate bioactive compounds like lentinan and beta-glucans for potency. Cooking fresh shiitake can reduce some heat-sensitive compounds, whereas dried or extracted supplements may preserve or concentrate these polysaccharides depending on processing methods. The choice depends on whether you prioritize whole-food nutrition or targeted immune support through isolated active compounds.

### Is shiitake mushroom safe for pregnant women and nursing mothers?

While shiitake is commonly consumed as food in many cultures, specific safety data for supplement use during pregnancy and lactation is limited. Pregnant and nursing women should consult their healthcare provider before taking shiitake supplements, as the concentrated forms differ from dietary consumption. Whole shiitake mushrooms in normal food amounts are generally considered safe, but therapeutic doses warrant medical guidance.

### Which food sources naturally contain shiitake, and can you get health benefits from diet alone?

Shiitake mushrooms are widely available fresh, dried, or in culinary products, particularly in East Asian cuisines, and regular consumption provides beneficial nutrients and compounds. However, the concentration of bioactive compounds like lentinan in whole food may be lower than in standardized supplements, so therapeutic-level immune support may require supplementation. Incorporating shiitake regularly into your diet supports nutritional status, though specific health claims typically rely on study doses found in concentrated supplement forms.

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