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Reishi Mushroom
Reishi has a real but modest signal for immune modulation and quality of life in cancer patients, and a smaller signal for fatigue and sleep.
- Evidence
- Mixed Evidence
- Category
- Immune Support
- Best form
- Dual-extracted (water + ethanol) fruiting body powder, ≥10% beta-glucans verified
- Effective dose
- 1,500-5,400mg/day of dried fruiting body or polysaccharide extract
- Lab tested
- 5 of 9 products
- Category
- Immune Support
- Best form
- Dual-extracted (water + ethanol) fruiting body powder, ≥10% beta-glucans verified
- Effective dose
- 1,500-5,400mg/day of dried fruiting body or polysaccharide extract
- Lab tested
- 5 of 9 products
Key takeaways
- →Modest evidence for immune markers and quality of life in cancer patients; sleep and fatigue signals are real but small.
- →Use a dual-extracted fruiting body product with verified beta-glucan content; mycelium-on-grain dilutes the active fractions with starch.
- →Real Mushrooms and Nootropics Depot are the cleanest fruiting-body picks; Host Defense and Om use mycelium-on-grain (the Stamets format).
- →Skip if you take anticoagulants, antiplatelets, or are within 2 weeks of surgery; reishi has real anti-platelet activity.
What Is Reishi Mushroom?
Reishi has a real but modest signal for immune modulation and quality of life in cancer patients, and a smaller signal for fatigue and sleep. The Cochrane review (Jin 2016) of 5 RCTs in 373 cancer patients found Ganoderma improved immune cell counts and self-reported quality of life when used alongside chemo or radiation, but did not improve survival or tumor response, and study quality was low. The standalone story for healthy adults is thinner, mostly small Asian trials with active-comparator or open-label designs.
Tang 2005 randomized 132 patients with neurasthenia (chronic fatigue plus mood symptoms) to a Ganoderma polysaccharide extract or placebo for 8 weeks. Fatigue scores improved 28% vs 20% in the placebo arm, and 52% of the Ganoderma group rated themselves more than minimally improved versus 25% in placebo. Zhao 2012 ran a small (n=48) pilot of cracked-spore powder in breast cancer patients on endocrine therapy and found significant improvement in fatigue and physical wellbeing scores at 4 weeks. Sleep-quality data is thinner still and mostly piggybacks on those fatigue trials, so "reishi for sleep" is a reasonable bet but not a clinical lock.
The cardiovascular and metabolic story is weaker. Chu 2012 ran a 12-week cross-over RCT of 1.44g/day Lingzhi extract in 26 patients with borderline blood pressure and cholesterol. Blood pressure and weight were unchanged. Insulin and HOMA-IR dropped slightly, and there was a non-significant trend toward lower triglycerides and higher HDL. The Klupp 2015 Cochrane review of 5 RCTs and Klupp 2016 RCT (n=84, 3g/day for 16 weeks) both concluded that Ganoderma had no clinically meaningful effect on glycemia, blood pressure, or lipids in adults with metabolic syndrome.
Product quality is the variable that probably matters more than dose. Reishi has two distinct active fractions: water-soluble polysaccharides (beta-glucans, the immune-relevant fraction the Cochrane trials measured) and alcohol-soluble triterpenoids (the bitter "ganoderic acids" linked to the calming and hepatoprotective effects). A water-only extract captures the first but not the second. A pure-ethanol extract does the opposite. Dual-extracted fruiting body, where the same biomass is processed in both solvents, is what most reishi research actually used. Spore powder is concentrated triterpenes and is what Zhao 2012 used. Mycelium grown on grain (the cheapest and most common US format) dilutes both fractions with starch, often testing under 5% beta-glucans against 25-30%+ in fruiting body extracts. The "polysaccharides" line on a mycelium-on-grain label may be 70%+ grain starch, not bioactive fungal beta-glucans.
Safety is good in trials but worth flagging. Reishi has anti-platelet activity, and there are real concerns about additive bleeding risk with anticoagulants, antiplatelets, and the two-week pre-surgery window. LiverTox classifies reishi as a possible rare cause of clinically apparent liver injury based on a handful of case reports including one fatal case in a Thai woman who switched to a powdered product, though attribution is weak in most reports and controlled trials show no liver-enzyme signal.
Does It Work? The Evidence
How A-F grades workImmune cell counts and quality of life as cancer-treatment adjunct
Jin et al. 2016 Cochrane review of 5 RCTs (n=373): Ganoderma improved CD3, CD4, CD8 and NK cell counts and self-reported quality of life when added to chemotherapy or radiation; no benefit on survival or tumor response; evidence quality rated low to very low.
Fatigue and wellbeing in chronic conditions
Tang et al. 2005 RCT (n=132 neurasthenia, 8 weeks, Ganoderma polysaccharide extract): fatigue improved 28% vs 20% placebo, 52% vs 25% rated as more than minimally improved. Zhao et al. 2012 pilot (n=48 breast cancer patients on endocrine therapy, 4 weeks of spore powder): significant improvement in fatigue and physical wellbeing subscales.
Sleep quality
Sleep improvements are reported as secondary outcomes in Tang 2005 and the Zhao 2012 spore-powder trial, plus small Asian trials in insomnia patients. No large dedicated polysomnography RCT.
Blood pressure, lipids, and glycemic control
Chu et al. 2012 cross-over RCT (n=26, 1.44g/day for 12 weeks): no change in BP or weight, small drop in insulin and HOMA-IR, non-significant trend in TG and HDL. Klupp et al. 2015 Cochrane review (5 RCTs) and Klupp et al. 2016 RCT (n=84, 3g/day, 16 weeks): no clinically meaningful effect on hyperglycemia, hypertension, or lipid profile in metabolic syndrome.
Antioxidant and hepatoprotective markers in healthy adults
Small crossover trials of triterpenoid- and polysaccharide-enriched Ganoderma report short-term increases in plasma antioxidant capacity and modest changes in liver enzymes. Sample sizes are small and effect sizes are unclear in clinical terms.
| Grade | Claimed Benefit | Key Studies | Our Verdict |
|---|---|---|---|
| B | Immune cell counts and quality of life as cancer-treatment adjunct | Jin et al. 2016 Cochrane review of 5 RCTs (n=373): Ganoderma improved CD3, CD4, CD8 and NK cell counts and self-reported quality of life when added to chemotherapy or radiation; no benefit on survival or tumor response; evidence quality rated low to very low. | Early Signal |
| C | Fatigue and wellbeing in chronic conditions | Tang et al. 2005 RCT (n=132 neurasthenia, 8 weeks, Ganoderma polysaccharide extract): fatigue improved 28% vs 20% placebo, 52% vs 25% rated as more than minimally improved. Zhao et al. 2012 pilot (n=48 breast cancer patients on endocrine therapy, 4 weeks of spore powder): significant improvement in fatigue and physical wellbeing subscales. | Early Signal |
| C | Sleep quality | Sleep improvements are reported as secondary outcomes in Tang 2005 and the Zhao 2012 spore-powder trial, plus small Asian trials in insomnia patients. No large dedicated polysomnography RCT. | Early Signal |
| C | Blood pressure, lipids, and glycemic control | Chu et al. 2012 cross-over RCT (n=26, 1.44g/day for 12 weeks): no change in BP or weight, small drop in insulin and HOMA-IR, non-significant trend in TG and HDL. Klupp et al. 2015 Cochrane review (5 RCTs) and Klupp et al. 2016 RCT (n=84, 3g/day, 16 weeks): no clinically meaningful effect on hyperglycemia, hypertension, or lipid profile in metabolic syndrome. | Conflicted |
| D | Antioxidant and hepatoprotective markers in healthy adults | Small crossover trials of triterpenoid- and polysaccharide-enriched Ganoderma report short-term increases in plasma antioxidant capacity and modest changes in liver enzymes. Sample sizes are small and effect sizes are unclear in clinical terms. | Early Signal |
How to Choose: Forms, Doses & What Matters
Clinical dose: 1,500-5,400mg/day of dried fruiting body or polysaccharide extract; 1,440mg/day in the cardiometabolic trial; spore powder dosing varies by product
Best forms: Dual-extracted (water + ethanol) fruiting body powder, ≥10% beta-glucans verified, Hot-water fruiting body extract (captures polysaccharides; misses triterpenes), Cracked-cell-wall spore powder (triterpene-rich, used in cancer-fatigue trials)
Take 1,500-3,000mg/day of a dual-extracted fruiting body capsule or powder with food; tolerability is better with meals. Split AM and PM if using for daytime fatigue, or take the full dose 1-2 hours before bed if sleep is the goal. Spore powder products dose lower (often 1-2g/day) because of their concentrated triterpene content. Allow 4-8 weeks of daily use to assess effect. Bitter taste is a quality marker for triterpene content; sweet, bland reishi powders are usually grain-based mycelium. Stop 2 weeks before any planned surgery.
Who Should Take Reishi Mushroom?
Adults looking for an adaptogen with real immune-modulation data, especially during cancer treatment when used alongside (not in place of) standard care. People with chronic fatigue, mild sleep disturbance, or stress-related malaise who want to try a calming tonic with a long traditional record. Those who already eat for general health and want to add a researched mushroom rather than a proprietary blend. Best fit for users willing to pay for a verified fruiting-body extract, since cheaper grain-based products may not deliver the active compounds.
Who Should Avoid It?
Not for everyone
Side Effects & Safety
Product Scores
9 products scored on dosing accuracy, third-party testing, cost per effective dose, and label transparency.
The Scorecard: 9 Products Compared
Reishi Mushroom Capsules (100% Fruiting Body)
Real Mushrooms
$35.95 ÷ 45 days at 1000mg/day (1 serving × 1000mg)
One of the few US reishi brands that publishes raw beta-glucan vs alpha-glucan numbers, which is the test that exposes mycelium-on-grain dilution.
Prices checked 2026-04-27. Cost shown is per clinically effective daily dose, not per pill.
Red Reishi Mushroom Capsules (8:1 Dual Extract) 500mg, 180ct
Nootropics Depot$30.99 ÷ 91 days at 1000mg/day (2 servings × 500mg)
Nootropics Depot is one of the few US sellers that openly publishes per-batch identity and ganoderic acid testing for its mushroom line.
Prices checked 2026-04-27. Cost shown is per clinically effective daily dose, not per pill.
Reishi Mushroom Powder (45 Servings)
Real Mushrooms
$29.95 ÷ 45 days at 2000mg/day (1 serving × 2000mg)
Best pick for users who want a higher daily reishi load (2-3g) without the cost or pill burden of capsules.
Prices checked 2026-04-27. Cost shown is per clinically effective daily dose, not per pill.
Super Reishi 120 Tablets
Mushroom Wisdom
$32.50 ÷ 120 days at ~199mg/day (0.5 servings × 400mg)
Log cultivation more closely matches the wild conditions reishi has historically been grown under and tends to produce stronger triterpene profiles than indoor sawdust block.
Prices checked 2026-04-27. Cost shown is per clinically effective daily dose, not per pill.
Reishi Mushroom 600mg
Solaray
$17.99 ÷ 100 days at 600mg/day (1 serving × 600mg)
Solaray is a budget pick for trying reishi cheaply; once you decide it works, step up to a verified fruiting body extract for a fairer test of the supplement.
Prices checked 2026-04-27. Cost shown is per clinically effective daily dose, not per pill.
Reishi Mushroom 40 Liquid Phyto-Capsules
Gaia Herbs$39.99 ÷ 40 days at 480mg/day (1 serving × 480mg)
Good fit for users who care most about herbal sourcing transparency and are willing to combine it with a higher-dose extract for the actual reishi load.
Prices checked 2026-04-27. Cost shown is per clinically effective daily dose, not per pill.
Reishi Mushroom 600mg
Swanson
$8.99 ÷ 30 days at 1200mg/day (2 servings × 600mg)
Swanson's reishi is fine as an entry-level whole-mushroom product but has the same standardization gap as most generic reishi powders.
Prices checked 2026-04-27. Cost shown is per clinically effective daily dose, not per pill.
Reishi Capsules 120ct
Host Defense
$29.95 ÷ 60 days at 500mg/day (1 serving × 500mg)
Host Defense's myceliated-rice approach is the most defensible version of mycelium-on-grain because the rice substrate is also fermented, but it still does not match the beta-glucan density of pure fruiting body.
Prices checked 2026-04-27. Cost shown is per clinically effective daily dose, not per pill.
Reishi Mushroom Capsules 90ct
Om Mushroom Superfood
$24.99 ÷ 30 days at 667mg/day (1 serving × 667mg)
Om is one of the more transparent mycelium-on-grain brands, but the format itself means the beta-glucan and triterpene density is well below a fruiting-body extract.
Prices checked 2026-04-27. Cost shown is per clinically effective daily dose, not per pill.
Full Comparison
| Category | Reishi Mushroom Capsules (100% Fruiting Body) Real Mushrooms | Red Reishi Mushroom Capsules (8:1 Dual Extract) 500mg, 180ct Nootropics Depot | Reishi Mushroom Powder (45 Servings) Real Mushrooms | Super Reishi 120 Tablets Mushroom Wisdom | Reishi Mushroom 600mg Solaray | Reishi Mushroom 40 Liquid Phyto-Capsules Gaia Herbs | Reishi Mushroom 600mg Swanson | Reishi Capsules 120ct Host Defense | Reishi Mushroom Capsules 90ct Om Mushroom Superfood |
|---|---|---|---|---|---|---|---|---|---|
| Brand Score | 93/100Winner | 92/100 | 91/100 | 86/100 | 76/100 | 75/100 | 74/100 | 70/100 | 70/100 |
| Dosing & Form | 25/25Winner | 25/25 | 25/25 | 22/25 | 19/25 | 19/25 | 19/25 | 16/25 | 16/25 |
| Purity | 23/25Winner | 22/25 | 23/25 | 19/25 | 19/25 | 19/25 | 17/25 | 19/25 | 19/25 |
| Value | 22/25Winner | 22/25 | 20/25 | 22/25 | 19/25 | 14/25 | 19/25 | 16/25 | 16/25 |
| Transparency | 23/25Winner | 23/25 | 23/25 | 23/25 | 19/25 | 23/25 | 19/25 | 19/25 | 19/25 |
| Cost/Day | $0.80 | $0.34 | $0.66 | $0.27 | $0.18Winner | $1.00 | $0.30 | $0.50 | $0.83 |
| Dose/Serving | 1000mg | 500mg | 2000mg | 400mg | 600mg | 480mg | 600mg | 500mg | 667mg |
| Form | Hot-water extract, 100% fruiting body, ≥25% beta-glucans | 8:1 Dual Extract (water + ethanol), whole fruiting body | Hot-water extract powder, 100% fruiting body, ≥25% beta-glucans | Log-grown fruiting body, hot water + alcohol extract | Whole mushroom powder | Liquid phyto-cap, fruiting body extract | Whole mushroom powder | Mycelium + fermented brown rice biomass (Stamets format) | Mycelial biomass + fruiting body cultured on organic oats |
| Third-Party Tested | ✓ Yes | ✓ Yes | ✓ Yes | No | No | ✓ Yes | No | No | ✓ Yes |
| Proprietary Blend | No | No | No | No | No | No | No | No | No |
Frequently Asked Questions
What is the difference between reishi fruiting body and mycelium-on-grain?
The fruiting body is the visible mushroom (the bracket-shaped reddish-brown cap) and contains the highest concentration of beta-glucans and triterpenes, the compounds Cochrane and Tang trials measured. Mycelium-on-grain is the white root-like network grown on rice or oats; the harvested product is mostly the grain substrate, not pure mycelium, and typically tests at 35-70% starch with as little as 1-5% beta-glucans. Pure fruiting body extracts often hit 25-30%+ beta-glucans. The clinical evidence for reishi is overwhelmingly on fruiting body or spore products, not on grain-based mycelium.
Spore powder vs whole mushroom: which is better?
They are different products. Whole fruiting body and dual extracts give you the broad polysaccharide plus triterpene mix that most immune and quality-of-life trials used. Spore powder, especially with the cell wall cracked, concentrates triterpenes and is what Zhao 2012 used in the breast-cancer fatigue pilot. If your goal is immune support during cancer care, the Cochrane evidence base is mostly on fruiting body extracts. If your goal is fatigue or calming effects, spore powder has a small but more direct evidence base.
Is the cancer evidence for reishi real?
Real but modest. The 2016 Cochrane review of 5 RCTs in 373 cancer patients found that adding Ganoderma to chemo or radiation improved immune cell counts (CD3, CD4, NK cells) and patient-reported quality of life, with no major safety signal. It did not improve tumor response and did not extend survival. Trial quality was low to very low. Reishi is reasonable as a quality-of-life adjunct discussed with your oncologist; it is not a substitute for cancer treatment.
Does reishi actually work for sleep?
There is a small early signal, mostly carried by fatigue trials (Tang 2005, Zhao 2012) where sleep was a secondary outcome, and by traditional Asian use as a calming shen tonic. There is no large polysomnography RCT. If your sleep problem is anxiety- or stress-related and you want to try a herbal with some calming-effect tradition, reishi is a reasonable option. If you have chronic insomnia, ashwagandha, magnesium glycinate, or melatonin have stronger trial data.
Can I take reishi with anticoagulants like warfarin or apixaban?
No, not without explicit clearance from your prescribing clinician. Reishi has documented anti-platelet activity and may add to bleeding risk. The same caution applies to antiplatelet drugs (aspirin, clopidogrel), high-dose NSAIDs, and the two weeks before any surgery. People with bleeding disorders or thrombocytopenia should also avoid.
How long does reishi take to work?
Most clinical trials ran 4 to 16 weeks. Tang 2005 saw fatigue and wellbeing changes by 8 weeks. Zhao 2012 saw cancer-related fatigue improve by 4 weeks of spore powder. Allow at least 4 weeks of daily use before judging effect. Reishi is not an acute-effect supplement; do not expect noticeable change in the first few days.
Why is reishi so bitter?
The bitterness comes from triterpenes (ganoderic acids, lucidenic acids), the alcohol-soluble fraction linked to calming and hepatoprotective effects. Pleasant, sweet-tasting reishi powders usually mean either heavy dilution with grain substrate or a water-only extract that has stripped out the triterpenes. Bitter equals more triterpenes; bland is a quality red flag.
Sources
- Jin X, Ruiz Beguerie J, Sze DM, Chan GC. Ganoderma lucidum (Reishi mushroom) for cancer treatment. Cochrane Database Syst Rev. 2016;4(4):CD007731.
- Tang W, Gao Y, Chen G, et al. A randomized, double-blind and placebo-controlled study of a Ganoderma lucidum polysaccharide extract in neurasthenia. J Med Food. 2005;8(1):53-58.
- Zhao H, Zhang Q, Zhao L, Huang X, Wang J, Kang X. Spore Powder of Ganoderma lucidum Improves Cancer-Related Fatigue in Breast Cancer Patients Undergoing Endocrine Therapy: A Pilot Clinical Trial. Evid Based Complement Alternat Med. 2012;2012:809614.
- Chu TT, Benzie IF, Lam CW, Fok BS, Lee KK, Tomlinson B. Study of potential cardioprotective effects of Ganoderma lucidum (Lingzhi): results of a controlled human intervention trial. Br J Nutr. 2012;107(7):1017-1027.
- Klupp NL, Chang D, Hawke F, et al. Ganoderma lucidum mushroom for the treatment of cardiovascular risk factors. Cochrane Database Syst Rev. 2015;(2):CD007259.
- Wachtel-Galor S, Yuen J, Buswell JA, Benzie IFF. Ganoderma lucidum (Lingzhi or Reishi): A Medicinal Mushroom. In: Herbal Medicine: Biomolecular and Clinical Aspects, 2nd edition. CRC Press/Taylor & Francis; 2011: Chapter 9.
- LiverTox: Clinical and Research Information on Drug-Induced Liver Injury. Lingzhi, Reishi. Bethesda (MD): National Institute of Diabetes and Digestive and Kidney Diseases; 2024.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products discussed on this page are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a qualified healthcare professional before starting any supplement regimen.