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Maitake Mushroom (Grifola frondosa)

Grifola frondosa
Evidence Level
Moderate
2 Clinical Trials
5 Documented Benefits
3/5 Evidence Score

Maitake ('dancing mushroom' in Japanese) is a culinary and medicinal mushroom native to East Asia and North America. Distinguished by its D-fraction beta-glucan polysaccharides — among the most clinically-studied immune-activating mushroom extracts. Used for immune support, blood sugar/insulin sensitivity, blood pressure, and as adjunct in some cancer protocols. MaitakeGold 404® and Maitake D-Fraction® are leading clinical products.

Studied Dose 1-3 mg D-fraction/kg body weight (50-300 mg D-fraction/day for typical adults); whole mushroom extracts 500-2,000 mg/day
Active Compound D-fraction beta-glucan (1,6-beta-glucan with 1,3-beta-glucan branches), MD-fraction, alpha-glucan

Benefits

Immune Activation (D-Fraction)

Maitake D-fraction is one of the most clinically-studied beta-glucan immune activators. Activates NK cells, macrophages, dendritic cells, T-cells via dectin-1 and complement receptor 3 (CR3) pathways. Strong immune modulation evidence.

Supported by Trial 2

Blood Sugar / Insulin Sensitivity

trial showed maitake (SX-fraction) reduced fasting glucose and HbA1c in T2DM patients. Improves insulin sensitivity. Modest but consistent metabolic effects.

Supported by Trial 1

Blood Pressure Support

Animal models and small human trials show modest BP reduction with maitake. Mechanism: ACE inhibition (mild), vasodilatory effects.

Supported by Trial 1, Trial 2

Cancer Adjunct Research

D-fraction extensively studied as adjunct to chemotherapy in Japan — particularly breast, colorectal, lung cancers. Improves quality of life, reduces chemotherapy side effects in some trials. Not standalone cancer therapy; adjunctive only.

Supported by Trial 2

Cholesterol Modest Effects

Some trials show modest cholesterol reduction. Less consistent than blood sugar effects.

Supported by Trial 1, Trial 2

Mechanism of action

1

D-Fraction Beta-Glucan Immune Activation

D-fraction is a highly purified polysaccharide-protein complex with specific 1,6-beta-glucan backbone and 1,3-beta-glucan branches. Binds dectin-1 and CR3 receptors on immune cells, activating innate immunity. Considered one of the most potent natural immunomodulators.

2

GLUT4 Translocation (Blood Sugar)

Maitake compounds enhance GLUT4 glucose transporter translocation to cell membranes — improving glucose uptake into peripheral tissues. Mechanism similar to insulin and exercise.

3

ACE Inhibition (Modest)

Some maitake compounds modestly inhibit angiotensin-converting enzyme — basis for BP-lowering effects. Effect smaller than prescription ACE inhibitors.

4

Apoptosis Induction in Cancer Cells

D-fraction activates cytotoxic immune responses against tumor cells while supporting host immunity. Adjunctive cancer immunology mechanism.

Clinical trials

1
Maitake SX-Fraction for T2DM

Trial of maitake SX-fraction in 5 T2DM patients showing modest glycemic improvements.

T2DM patients (small open-label study).

Reduced fasting glucose and HbA1c. Open-label small study. Subsequent larger trials confirm modest metabolic effects.

2
Maitake D-Fraction for Cancer

Trials of maitake D-fraction as cancer adjunct, especially in Japan. Multiple studies in breast, colorectal, lung cancer.

Cancer patients on chemotherapy.

Improved immune markers (NK cell activity, lymphocyte counts), reduced chemotherapy side effects, improved QoL in some trials. Adjunct only — not standalone cancer therapy. Established adjunct positioning in Japanese oncology.

Side effects and drug interactions

Common Potential side effects

Generally well-tolerated.
Hypoglycemia in sensitive individuals on diabetes medications.
Modest hypotension.
GI distress at high doses.
Allergic reactions to mushroom rare.
Theoretical immune activation concerns in autoimmune disease.

Important Drug interactions

Diabetes medications (insulin, sulfonylureas) — additive hypoglycemic effects; monitor blood glucose.
Antihypertensives — additive BP reduction; monitor.
Anticoagulants — theoretical bleeding risk at high doses; minor.
Immunosuppressants — maitake's immune activation could theoretically interfere with intentional immunosuppression; avoid in transplant patients without medical supervision.
Chemotherapy — used adjunctively in Japan; consult oncologist for specific regimens.
Pre-surgery — discontinue 1-2 weeks before.

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Frequently asked questions about Maitake Mushroom (Grifola frondosa)

What is maitake mushroom used for?

Maitake (hen of the woods) is a culinary and medicinal mushroom studied for immune support, healthy blood sugar, and cardiovascular health. Its beta-glucans, sometimes called the D-fraction, are the main active compounds.

What is maitake good for?

It is studied for immune modulation and for supporting healthy blood sugar and blood pressure. The maitake D-fraction (a specific beta-glucan) is a focus of immune research.

How much maitake should I take?

Supplement doses depend on the extract; follow product labeling, and look for standardized beta-glucan content. Maitake is also delicious as a food.

Is maitake safe?

Maitake is safe as a food and generally well tolerated as a supplement. Because it may lower blood sugar and blood pressure, those on related medications should monitor levels and check with a doctor.

What is Maitake Mushroom?

Maitake ('dancing mushroom' in Japanese) is a culinary and medicinal mushroom native to East Asia and North America. Distinguished by its D-fraction beta-glucan polysaccharides — among the most clinically-studied immune-activating mushroom extracts.

What is the recommended dosage of Maitake Mushroom?

The clinically studied dose is 1-3 mg D-fraction/kg body weight (50-300 mg D-fraction/day for typical adults); whole mushroom extracts 500-2,000 mg/day Always follow the product label and check with a healthcare provider for personal advice.

Is Maitake Mushroom safe, and does it have side effects?

For most healthy adults, Maitake Mushroom is well tolerated at studied doses. Reported effects can include: Generally well-tolerated. Hypoglycemia in sensitive individuals on diabetes medications. It may also interact with some medications. Maitake Mushroom is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Does Maitake Mushroom interact with any medications?

Possible interactions include: Diabetes medications (insulin, sulfonylureas) — additive hypoglycemic effects; monitor blood glucose. Antihypertensives — additive BP reduction; monitor. If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for Maitake Mushroom?

NutraSmarts rates the evidence for Maitake Mushroom as Moderate (3 out of 5). It is backed by 2 clinical trials and 5 cited references summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(5 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Jogi EM, Kato MC, Masuda Y, Konishi M, Kuwabara N, Sato S, Nakagawa S, Yamasaki K, Aoki R, Ohno M, Ohata S, Kato S, Hashimoto M. Maitake Mushroom (Grifola frondosa) Enhances Cognitive Function in Healthy Older Japanese: A Randomized, Double-Blind, Placebo-Controlled Trial. J Nutr Sci Vitaminol (Tokyo). 2026;72(2):163-175. doi: 10.3177/jnsv.72.163.PubMedUsed to support: Randomized controlled trial in which a Maitake mushroom extract enhanced cognitive function in healthy older adults. A recent human trial supporting a brain benefit.
  2. Kodama N, Komuta K, Nanba H. Effect of Maitake (Grifola frondosa) D-Fraction on the activation of NK cells in cancer patients. J Med Food. 2003;6(4):371-7. doi: 10.1089/109662003772519949.PubMedUsed to support: Study in cancer patients in which Maitake D-Fraction increased natural-killer-cell activity. Human support for the immune-modulating use.
  3. Vetvicka V, Vetvickova J. Immune-enhancing effects of Maitake (Grifola frondosa) and Shiitake (Lentinula edodes) extracts. Ann Transl Med. 2014;2(2):14. doi: 10.3978/j.issn.2305-5839.2014.01.05.PubMedUsed to support: Review of the immune-enhancing effects of Maitake (and Shiitake) beta-glucans on innate immunity. Supports the immune-support use and mechanism.
  4. Zhao F, Guo Z, Ma ZR, Ma LL, Zhao J. Antitumor activities of Grifola frondosa (Maitake) polysaccharide: A meta-analysis based on preclinical evidence and quality assessment. J Ethnopharmacol. 2021;280:114395. doi: 10.1016/j.jep.2021.114395.PubMedUsed to support: Meta-analysis of the antitumor activity of Maitake polysaccharide, based on preclinical (animal and cell) studies. Mechanistic support only; not human-outcome evidence.
  5. Zhang R, Xiao C, Yong T, Huang L, Hu H, Xie Y, Wu Q. Grifola frondosa Polysaccharide F2 Ameliorates Disordered Glucose and Lipid Metabolism in Prediabetic Mice by Modulating Bile Acids. Foods. 2025;14(6):. doi: 10.3390/foods14060955.PubMedUsed to support: Laboratory study showing a Maitake polysaccharide improved glucose and lipid metabolism in a prediabetic model. Preclinical support for the metabolic use, pending human trials.