Maitake
TL;DR
Maitake is a culinary-medicinal mushroom whose beta-glucan fraction shows immune-modulating activity. Human evidence is limited to small trials in immune markers and blood sugar.
Ideal For
- People wanting a food-grade beta-glucan source for general immune support
- Those already eating medicinal mushrooms who want a standardized extract
Avoid If
- You take warfarin — mushroom polysaccharides may affect its activity
- You are on immunosuppressive therapy after transplant
- You have a diagnosed mushroom allergy
Frequently Asked Questions
What is maitake?
Is there good human evidence?
Does it lower blood sugar?
What dose is used?
What should I check on the label?
Any safety concerns?
Overview
Grifola frondosa, known as maitake or hen of the woods, is a genuine food as well as a supplement, which puts a floor under its safety profile. Its researched constituent is the D-fraction, a proteoglucan isolated in Japan and studied for immune modulation. In vitro and animal work shows activation of macrophages, natural killer cells and dendritic cells via dectin-1 and complement receptor binding — the same pathway that underlies beta-glucan research generally. Human data is where the story thins. A phase I/II trial in postmenopausal breast cancer patients found dose-dependent immunological changes, both stimulatory and inhibitory, without clinical endpoints. Small studies have reported improved insulin sensitivity and modest glucose lowering, consistent with animal work, and an older study suggested benefit for ovulation in polycystic ovary syndrome. None of these are large or replicated. Maitake is a reasonable food-grade addition for someone interested in mushroom beta-glucans; claims of cancer treatment or reliable blood-sugar control go far beyond the evidence.
How It Works
- Beta-1,6 and beta-1,3 glucans bind dectin-1 on macrophages and dendritic cells, triggering innate immune activation
- Enhances natural killer cell cytotoxicity in laboratory and small clinical studies
- Improves insulin sensitivity in animal models, with modest human glucose effects reported
- Provides fermentable polysaccharide that feeds gut bacteria
Health Concerns Addressed
No linked health concerns yet.
Supporting Research5 studies
Maitake mushroom (Grifola frondosa): systematic review by the Natural Standard Research Collaboration
Ulbricht C, Weissner W, Basch E
Human evidence for maitake in cancer, diabetes and immune function is preliminary and of low quality.
A phase I/II trial of a polysaccharide extract from Grifola frondosa (Maitake mushroom) in breast cancer patients: immunological effects
Deng G, Lin H, Seidman A
Oral maitake extract produced both immune-stimulatory and immune-suppressive measurable effects without dose-limiting toxicity.
β-Glucan Metabolic and Immunomodulatory Properties and Potential for Clinical Application
Murphy EJ, Rezoagli E, Major I
Mushroom beta-glucans change immune markers in humans, but clinically meaningful outcomes are rarely reported.
Maitake mushroom (Grifola frondosa) extract induces ovulation in patients with polycystic ovary syndrome
Chen JT, Tominaga K, Sato Y
Maitake extract induced ovulation in a majority of women with polycystic ovary syndrome.
Antihyperglycemic effect of a mushroom-derived alpha-glucan on postprandial glucose: a randomized crossover trial
Kubo K, Nanba H, Aoki H
Maitake-derived polysaccharide modestly reduced postprandial glucose excursion.
Safety Information
Potential Side Effects
Mild digestive upset and, rarely, allergic reaction. Blood glucose may drop slightly, which matters for people on diabetes medication.
Contraindications
Transplant immunosuppression; mushroom allergy.
Drug Interactions
- Warfarin — case reports of altered INR with mushroom extracts
- Diabetes medications — additive glucose lowering
- Immunosuppressants — theoretical opposition of effect
Pregnancy & Breastfeeding
Pregnancy: Not enough evidence to judge
Breastfeeding: Not enough evidence to judge
Dosage Guidelines
Dosage Used in Studies
Consult healthcare provider
Dosing by Goal
| Goal | Dose | Notes |
|---|---|---|
| Standard extract | 500-1500 mg daily of hot-water extract | |
| D-fraction | Commonly 1-3 mg per kg body weight daily in research settings | |
| Notes | Look for stated beta-glucan percentage, not just polysaccharide content |
Forms Compared
D-fraction / MD-fraction extract
The standardized proteoglucan used in the clinical research
Hot-water extract
Necessary to liberate beta-glucans from chitin cell walls
Whole dried powder
Food-grade; much lower beta-glucan concentration
Fresh culinary mushroom
Genuinely nutritious and the cheapest option
Food & Timing
With or without food; some protocols split the dose morning and evening.
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.