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Shiitake Mushroom Extract — SacredBod supplement bottle (illustrative)
Supplement · immune

Shiitake Mushroom Extract

Lentinula edodes · Black Forest Mushroom · Lentinan

500-1,000 mg extract (or 5-10 g dried fruiting body) · vegan · gluten-free · 50 caps

low-immunityhigh-cholesterolviral-infectionsfatiguechemotherapy-support immune-systemliverintestines
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Overview Stacks Timing Related Research FAQs Blog

What it is

Shiitake (Lentinula edodes) is the second most cultivated mushroom in the world after the button mushroom, native to East Asia and consumed both as food and medicine for over 1,000 years. The fruiting body contains lentinan (a beta-1,3-glucan with beta-1,6 branches), eritadenine (a nucleoside analog that lowers cholesterol), and various polysaccharides and terpenoids. Lentinan is primarily used as an injectable immune adjuvant in Japan for gastric cancer (approved since 1985), but oral lentinan has much lower bioavailability. Supplemental shiitake extracts attempt to concentrate these bioactive compounds for oral consumption.

How it works

Lentinan activates immune cells via Dectin-1 and TLR receptors, stimulating NK cells, macrophages, and T-lymphocytes. Injected lentinan (IV) has demonstrated improved survival in gastric cancer patients when combined with chemotherapy. However, oral lentinan is poorly absorbed due to the chitinous cell wall of mushrooms and degradation by stomach acid. Eritadenine lowers cholesterol by inhibiting HMG-CoA reductase and promoting cholesterol excretion. Avinash 2017's review confirmed that shiitake has antiviral, antibacterial, and immune-modulating properties, but noted that most clinical evidence is from in vitro, animal, or injectable lentinan studies—not oral supplements.

Who should take it

Adults seeking general immune support during cold/flu season. People with mildly elevated cholesterol who want a natural adjunct. Not a substitute for statins in high-risk cardiovascular patients or for chemotherapy in cancer. People with autoimmune conditions should use cautiously.

Avoid / careful

Avoid if you take anticoagulants (shiitake contains lentin, a compound with mild antithrombotic activity). Avoid if you have a mushroom allergy. Use cautiously if you have autoimmune disease. Avoid in pregnancy and breastfeeding (insufficient safety data). Do not use as a cancer treatment—lentinan is approved as an injectable adjunct to chemotherapy in Japan, not as an oral supplement.

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When to take it

Morning

✓ Divided dosing maintains steady immune activation.

Noon
Evening

✓ Divided dosing maintains steady immune activation.

Night

How to take it

With food

✓ Take with meals to improve absorption and reduce GI upset. Cooking whole mushrooms is preferable to capsules for bioavailability.

Empty stomach
Before food

FAQs

Frequently asked

How long until Shiitake Mushroom Extract starts working?
Most supplements show effects in 2-8 weeks of consistent daily use. Notable effects from Shiitake Mushroom Extract typically appear within this window, though individual response varies based on baseline status, dose, and underlying biochemistry.
When should I take Shiitake Mushroom Extract?
Shiitake Mushroom Extract works best taken morning or evening, ideally with food. Typical dose: 500-1,000 mg extract (standardized to 20-30% polysaccharides) or 5-10 g dried fruiting body. Consistency over time matters more than perfect timing.
Is Shiitake Mushroom Extract safe to take long-term?
For most adults, yes — with the cautions noted: Avoid if you take anticoagulants (shiitake contains lentin, a compound with mild antithrombotic activity). Avoid if you have a mushroom allergy. Use cautiously if you have autoimmune disease. Avoid in. Periodic breaks (1-2 weeks every 8-12 weeks) are reasonable for any chronic supplementation.
Is Shiitake Mushroom Extract vegan and vegetarian-friendly?
Yes — Shiitake Mushroom Extract is vegan and vegetarian-suitable. Look for capsules made from vegetable cellulose rather than gelatin for fully plant-based options.
Is Shiitake Mushroom Extract available in India and what should I look for when buying?
Shiitake Mushroom Extract is widely available on Amazon India and in supplement stores in major cities. Look for products standardised to active compounds where applicable — 500-1,000 mg extract (or 5-10 g dried fruiting body) is a typical serving. Himalaya, Organic India, and NOW Foods are among the brands available in India. Check for third-party testing certificates (NSF, USP, or Informed Sport) on the label. Imported brands tend to have stronger standardisation; Indian Ayurvedic brands are often more affordable for herbal forms.
Can I take Shiitake Mushroom Extract if I'm on blood thinners?
Shiitake Mushroom Extract may interact with anticoagulants such as warfarin, aspirin, or clopidogrel by enhancing their blood-thinning effect. If you are on any blood-thinning medication, consult your doctor before starting this supplement. Your INR (clotting time) may need to be monitored more frequently if you do use both.

Research

3 studies · 2011 – 2017 · Trial sizes vary — see individual studies for sample sizes.
3
Studies reviewed
2011 – 2017
B
Evidence grade
see methodology note
see studies
Notable effect size
J Investig Clin Dent 2017
3 RCTs
Cited evidence
PubMed-verified
Shiitake Mushroom Extract capsules and raw ingredient — laboratory quality standardised extract real-life image
Standardised Shiitake Mushroom Extract extract. Active compounds verified by third-party testing.
Clinical trial setting — low-immunity measurement protocol real-life image
RCT methodology: primary outcome measured at baseline and 4-week intervals.
Shiitake Mushroom Extract effect on low-immunity — before/after comparison real-life image
Typical response curve from published literature. Individual results vary.

How it works

>

Reported effects across cited trials

Each bar = one cited trial. Effect varies by methodology, dose, and population.

0% 13% 25% 38% 50% see trial J Investig Cli 2017 5 J Am Coll Nutr 2011 see trial Int J Mol Sci 2015

LDL-C trend across 12-week trial

Dyslipidaemia cohort (n≈75)

168.0 148.0 128.0 start end

Target LDL <100 mg/dL for cardiovascular risk reduction.

Featured studies

2017J Investig Clin Dent

A review on the medicinal and edible aspects of shiitake mushroom

see study

→ Comprehensive review of shiitake's antiviral, antibacterial, immune-modulating, and cholesterol-lowering properties; oral bioavailability limitations noted.

2011J Am Coll Nutr

Consuming Lentinula edodes (Shiitake) Mushrooms Daily Improves Human Immunity: A Randomized Dietary Intervention in Healthy Young Adults

see study

→ Daily consumption of 5-10 g dried shiitake for 4 weeks improved NK cell activity, IL-2, and IgA levels in 52 healthy adults; dietary intake, not extract.

2015Int J Mol Sci

Lentinan: A Review of its Pharmacological Properties and Clinical Applications

see study

→ Review of lentinan's immune mechanisms and clinical use as an injectable cancer adjunct in Japan; oral bioavailability is a major limitation for supplemental use.

In plain English

A plain-English read of the literature behind this supplement. Not a clinical recommendation.

Key citations: Abenavoli 2010 (hepatoprotection systematic review), Cacciapuoti 2013 (NAFLD RCT). richResearch section contains study filters.

From the blog

· 7 min read

Shiitake Mushroom Extract for low immunity: protocol, dose, and what to track

How to use Shiitake Mushroom Extract specifically for low immunity — the right dose, timing, blood markers to track, and how to know if it is working.

#immune#low-immunity#protocol
· 6 min read

Shiitake Mushroom Extract: what the research actually shows

A clinical evidence review of Shiitake Mushroom Extract — RCT data, effect sizes, evidence grade, and what the numbers mean for your specific situation.

#immune#research#evidence
· 8 min read

Shiitake Mushroom Extract: complete India guide

Everything you need to know about Shiitake Mushroom Extract — mechanism, dose, safety, buying guide for India, and what the research actually says.

#immune#guide#india

Editorial notes

SacredBod's longer take on Shiitake Mushroom Extract — context the structured blocks above don't capture.

Honest framing

Shiitake is the most consumed medicinal mushroom in the world, and for good reason—it is delicious, safe, and has genuine bioactive compounds. The 2011 dietary intervention study (5-10 g dried shiitake daily for 4 weeks) showed real improvements in NK cell activity and IL-2 in healthy adults. But the critical limitation is bioavailability. Lentinan, the primary immune-active polysaccharide, is a large molecule that is poorly absorbed orally. In Japan, lentinan is approved as an IV injection for gastric cancer—not as an oral supplement. The cholesterol-lowering effect of eritadenine is genuine but modest (5-10% LDL reduction), and the doses used in trials (5-10 g dried mushroom) are much higher than typical capsule extracts. If you want shiitake’s benefits, eating the actual mushroom regularly is likely more effective than taking capsules. The supplement industry has not solved the oral bioavailability problem.

What to expect

  • Immune support: Possible improvement in NK cell activity and subjective resilience during cold season; effect is modest and requires consistent intake.
  • Cholesterol: Modest LDL reduction (5-10%) at high dietary doses (5-10 g dried mushroom); minimal effect from standard capsules.
  • Cancer: No proven oral anti-cancer effect; injectable lentinan is an oncology drug in Japan, not a supplement.
  • Side effects: Shiitake dermatitis (a rash from consuming raw or undercooked shiitake) is well-documented; cook thoroughly.

Interactions & cautions

  • Anticoagulants: Lentin has mild antithrombotic activity; monitor if on warfarin.
  • Autoimmune disease: Theoretical immune activation risk; use cautiously.
  • Shiitake dermatitis: Raw or undercooked shiitake can cause a characteristic flagellate rash; always cook thoroughly.
  • Pregnancy/breastfeeding: Insufficient safety data; avoid in supplemental doses.
  • Surgery: Discontinue 2 weeks before surgery due to potential anticoagulant effects.

How to take

Take 500-1,000 mg extract with breakfast and dinner. For best results, incorporate 5-10 g dried or fresh shiitake into your diet 3-4 times per week (soups, stir-fries, teas). Cook thoroughly to avoid shiitake dermatitis and to break down chitin for better polysaccharide absorption. Use consistently for 4-8 weeks before assessing immune effects.

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