Reishi mushroom

otheroct-1-en-3-ol

What is it

Reishi mushroom (Ganoderma lucidum) is a polypore fungus used in traditional East Asian medicine for centuries. Modern supplements use the dried fruiting body, mycelium, or spores in powders, capsules, teas, and tinctures.

How it works

Reishi contains beta-glucan polysaccharides and triterpenoid compounds (ganoderic acids) that interact with the immune system. The polysaccharides bind to receptors such as dectin-1 and TLR2/4 on macrophages and other immune cells, modulating cytokine release and natural killer cell activity. Triterpenoids contribute anti-inflammatory and hepatoprotective effects in preclinical models. They inhibit certain inflammatory enzymes and have shown antioxidant activity. Some research suggests reishi may influence the autonomic nervous system to support relaxation and sleep, though mechanisms are not fully characterized. Reishi compounds have been studied for cardiovascular effects including modest reductions in blood pressure, improvements in lipid profiles, and antiplatelet activity. In oncology research, reishi has been investigated as an adjuvant therapy, with some evidence suggesting improved immune function and quality of life in cancer patients receiving conventional treatment.

Evidence for 4 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Immune modulation

Grade C

Moderate evidence

Reishi polysaccharides influence immune cell activity in clinical studies, particularly natural killer cells and macrophages. Clinical benefits are most evident in immunocompromised populations.

Cancer adjuvant

Grade C

Moderate evidence

Used alongside conventional cancer therapy, reishi extracts have shown improvements in quality of life and immune function in several trials. Not a replacement for standard treatment.

Fatigue

Grade D

Mixed evidence

Limited evidence suggests reishi may reduce fatigue, especially cancer-related fatigue, but trials are small and findings inconsistent.

Cardiovascular markers

Grade D

Mixed evidence

Modest improvements in blood pressure and lipid profiles have been reported, but evidence is inconsistent across studies.

3 commercial forms

Whole mushroom powder

Lower concentration of bioactives; requires higher doses than extracts.

Traditional preparation; quality varies with sourcing and cultivation.

Hot water extract

Concentrates polysaccharides for immune effects.

Standard pharmacological preparation used in much clinical research.

Dual extract

Combines water and alcohol extraction to capture polysaccharides and triterpenoids.

Often regarded as the most complete extract for capturing reishi's bioactive profile.

Dosage

Typical doses are 1.5-9 grams per day of dried mushroom or 1-1.5 grams of standardized extract. Most clinical studies use extracts standardized to polysaccharide content. There is no established RDA or universally accepted optimal dose.

When and how to take it

Reishi can be taken at any time. Many users take it in the evening for purported calming effects, while others prefer morning use. Taking with food may reduce GI upset. Consistent daily intake over weeks is needed to observe effects on immune function or wellbeing.

Safety

Reishi is well tolerated for short-term use up to a year. Common side effects include dry mouth, throat irritation, mild GI upset, dizziness, and itching. Rare cases of liver toxicity have been reported, primarily with powdered products of uncertain quality.

Who should be cautious

Avoid in pregnancy and breastfeeding due to insufficient safety data. People taking blood thinners should consult a clinician. Stop use 1-2 weeks before scheduled surgery. People with mushroom allergies and those on immunosuppressant medications should avoid reishi products.

Interactions

Reishi may have antiplatelet effects and could increase bleeding risk when combined with anticoagulants. It may also lower blood pressure and glucose, potentially enhancing the effects of related medications. Concurrent use with immunosuppressants is not well studied and should be approached cautiously.

Frequently asked questions

How is this entry different from the other reishi listing?⌄

This is an alternate database entry referring to the same mushroom species. The supplement, traditional uses, and evidence base are the same.

What's the best form of reishi?⌄

Dual-extract preparations capture the widest range of bioactive compounds. Look for products standardized to polysaccharide and triterpenoid content.

How long should I take reishi before seeing effects?⌄

Allow 4-8 weeks of consistent daily use. Effects on immune markers and wellbeing develop gradually.

Is reishi safe with my heart medications?⌄

Reishi can affect blood pressure and clotting. Talk with your clinician before adding it to a regimen that includes cardiac medications.

References

  • NCCIH: Reishi Mushroom — National Center for Complementary and Integrative Health link
  • Wikidata: Reishi — Wikidata link

Track Reishi mushroom with Pilora

Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.

Coming to App Store

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you're pregnant, breastfeeding, on medications, or managing a chronic condition.