Supplements
Lion's mane: mushroom forms, cognition trials, mood claims and safety limits
On this page
Lion's mane is the edible fungus Hericium erinaceus, with white spines. It grows on hardwood trees and is used in supplements. A mushroom eaten as food and a concentrated preparation are different exposures; the species name alone does not identify the tested material.[1]
Separate the mushroom, fungal tissue and extract
| Form or term | What it describes | Evidence boundary |
|---|---|---|
| Fruiting body | The visible spiny mushroom used as food | A food serving is not an extract[1] |
| Cultivated mycelium | Threadlike fungal growth produced in culture | The 2020 trial used erinacine A-enriched material[4] |
| Fruiting-body extract | Selected constituents recovered with water and ethanol | The 2025 experiment tested a specified extract[6] |
| Wild versus cultivated | Different ways of obtaining fungal material | The 2009 powder trial does not compare these origins[2] |
An extract ratio does not demonstrate a brain effect
The 2025 trial used a fruiting-body extract made with water and ethanol, then spray-dried with maltodextrin. Its stated 10:1 extraction ratio described processing, not a tenfold clinical benefit. Fruiting bodies and mycelia contain different profiles of compounds. Comparing a capsule, mushroom coffee and an enriched mycelial product therefore requires their actual composition and tested outcomes; grams of one preparation cannot establish equivalence to another.[6]
Nerve-growth biology remains a rationale
Erinacines and hericenones are investigated in cells and animals. LiverTox describes rat evidence for brain entry and laboratory work involving nerve growth factor. These observations suggest hypotheses, but do not establish nerve regeneration, dementia prevention or cancer treatment in people. The constituent responsible for any human effect remains uncertain.[1]
Evidence & uncertainty
Small human experiments have produced positive findings on selected tasks and negative findings on others. A four-week study in healthy young adults found no improvement in its measured cognition or exercise-metabolism outcomes. This supports a bounded interpretation of claims, rather than assuming that every preparation improves the brain.[8]
Selected-source overview · Independent review pendingPublished questions
Are lion's mane fruiting body and mycelium the same preparation?
Selected-source overview · Independent review pending. Read the evidence context.
No. The 2020 trial tested cultivated mycelia enriched for erinacine A. Its findings cannot automatically be transferred to ordinary fruiting-body powder or a differently manufactured supplement.[4]
Evidence behind this answer
- Prevention of Early Alzheimer’s Disease by Erinacine A-Enriched Hericium erinaceus Mycelia Pilot Double-Blind Placebo-Controlled Study
randomized pilot trial · 2020
Selected original full-text methods, results and limitations inspected; no independent systematic appraisal · Cultivated enriched mycelia; 49 randomized; Table 2 intergroup versus intragroup cognitive outcomes; adverse events; conflicts
This answer summarizes selected sources. An independent appraisal of the complete evidence has not been completed.
Does lion's mane improve memory?
Selected-source overview · Independent review pending. Read the evidence context.
Human findings are mixed. A 30-person impairment trial reported better cognitive screening scores during use; a four-week college-age study found no cognitive benefit. These small, different studies do not establish a reliable general memory effect.[2][8]
Evidence behind this answer
- Improving effects of the mushroom Yamabushitake on mild cognitive impairment: a double-blind placebo-controlled clinical trial
randomized controlled trial · 2009
Original indexed abstract and bibliographic record inspected; attempted page open was unavailable or challenge-blocked; full text not independently inspected · 30 participants, HDS-R-based scale, 16 weeks and four-week post-intake decline - Four Weeks of Hericium erinaceus Supplementation Does Not Impact Markers of Metabolic Flexibility or Cognition
placebo controlled trial · 2022
Original indexed abstract and selected indexed PMC methods/results inspected; direct full-text open challenge-blocked · 24 college-age adults, matched muffins, four weeks, exercise-metabolism and cognitive null results
This answer summarizes selected sources. An independent appraisal of the complete evidence has not been completed.
Does a lion's mane cognitive screening result prove dementia prevention?
Selected-source overview · Independent review pending. Read the evidence context.
No. The 2019 trial measured cognitive test performance over 12 weeks, not the incidence of dementia over years. Its different tests also did not improve consistently.[3]
Evidence behind this answer
- Improvement of cognitive functions by oral intake of Hericium erinaceus
randomized controlled trial · 2019
Selected original full-text methods, results and limitations inspected; no independent systematic appraisal · 31 analyzed, 12 weeks; age-adjusted MMSE interaction p0.029, Benton and S-PA nulls; low-MMSE exclusion
This answer summarizes selected sources. An independent appraisal of the complete evidence has not been completed.
Is the lion's mane stress result in young adults conclusive?
Selected-source overview · Independent review pending. Read the evidence context.
No. The 2023 pilot’s subjective-stress result was a statistical trend, p=0.051, and other cognitive results were mixed. A larger replication is needed.[5]
Evidence behind this answer
- The Acute and Chronic Effects of Lion’s Mane Mushroom Supplementation on Cognitive Function, Stress and Mood in Young Adults
randomized pilot trial · 2023
Original indexed abstract and selected indexed results passages inspected; PMC challenge and publisher rate limit prevented independent full-text inspection · 41 adults; Stroop speed; p=0.051 subjective-stress trend; mixed positive/negative outcomes
This answer summarizes selected sources. An independent appraisal of the complete evidence has not been completed.
Does lion's mane reliably improve focus after a single intake?
Selected-source overview · Independent review pending. Read the evidence context.
The 2025 trial found no significant overall cognitive or mood improvement at 90 minutes, although pegboard performance improved. This does not demonstrate a general immediate focus effect.[6]
Evidence behind this answer
- Acute effects of a standardised extract of Hericium erinaceus on cognition and mood in healthy younger adults
randomized crossover trial · 2025
Selected original full-text methods, results and limitations inspected; no independent systematic appraisal · 18 participants, extract preparation, global composites null, pegboard result, exclusions and company affiliations
This answer summarizes selected sources. An independent appraisal of the complete evidence has not been completed.
Has lion's mane been established as a treatment for depression?
Selected-source overview · Independent review pending. Read the evidence context.
The small cookie study tested questionnaires and complaint items in women over four weeks. Its selected findings do not establish treatment of diagnosed major depression.[7]
Evidence behind this answer
- Reduction of depression and anxiety by 4 weeks Hericium erinaceus intake
randomized controlled trial · 2010
Original PubMed abstract and publisher abstract inspected; full study PDF not independently inspected · 30 women, cookies, CES-D and complaint outcomes; within-group versus between-group findings
This answer summarizes selected sources. An independent appraisal of the complete evidence has not been completed.
Have any human lion's mane trials found no cognitive benefit?
Selected-source overview · Independent review pending. Read the evidence context.
Yes. The four-week muffin study in 24 college-age adults found no significant benefit on its cognitive measures. Negative findings belong alongside favorable pilot results.[8]
Evidence behind this answer
- Four Weeks of Hericium erinaceus Supplementation Does Not Impact Markers of Metabolic Flexibility or Cognition
placebo controlled trial · 2022
Original indexed abstract and selected indexed PMC methods/results inspected; direct full-text open challenge-blocked · 24 college-age adults, matched muffins, four weeks, exercise-metabolism and cognitive null results
This answer summarizes selected sources. An independent appraisal of the complete evidence has not been completed.
Can lion's mane cause adverse effects despite being an edible mushroom?
Selected-source overview · Independent review pending. Read the evidence context.
Yes. Gastrointestinal symptoms and hypersensitivity have been reported. LiverTox’s lack of a recognized liver-injury signal does not mean all preparations or combinations are risk-free.[1]
Evidence behind this answer
- Lion's Mane
official safety review · 2024
Selected original full-text methods, results and limitations inspected; no independent systematic appraisal · Overview, fungal description, laboratory versus human evidence, gastrointestinal effects, hypersensitivity and liver-injury limitations
This answer summarizes selected sources. An independent appraisal of the complete evidence has not been completed.
The early impairment trial tested a small, specific group
Mori and colleagues randomized 30 Japanese adults aged 50–80 with mild cognitive impairment to dried mushroom powder tablets or placebo for 16 weeks. Scores based on the Revised Hasegawa Dementia Scale were higher in the mushroom group at weeks 8, 12 and 16. Scores declined four weeks after intake ended. This is an interesting preliminary signal in a diagnosed group. Fifteen people per arm and short follow-up cannot establish prevention of Alzheimer’s disease, durable everyday independence or an effect in healthy students.[2]
The older-adult study did not improve every cognitive test
A 2019 trial analyzed 31 healthy adults aged at least 50 after 12 weeks of fruiting-body powder or placebo. An age-adjusted analysis found a Mini-Mental State Examination interaction, p=0.029; the Benton visual-retention and verbal paired-associate tests showed no clear benefit. One participant with an initially low MMSE was excluded. A screening-test result and a reduction in future dementia diagnoses answer different questions. With several tests and selected healthy participants, selective improvement may reflect a narrow effect, measurement variation, ceiling effects or chance.[3]
Read the Alzheimer pilot beyond its positive title
The 2020 pilot randomized 49 people with mild Alzheimer’s disease to enriched cultivated mycelia or placebo and followed them for 49 weeks. The mushroom arm improved within its own group on MMSE, but between-group MMSE and Cognitive Abilities Screening Instrument comparisons were not statistically significant. Instrumental daily-living scores differed at week 49. This mixed pattern is more informative than calling the trial proof of prevention. Several authors were employees of the product manufacturer, and abdominal discomfort, nausea and rash contributed to withdrawals.[4]
Faster performance on one task is not general enhancement
In a 2023 pilot, 41 healthy adults aged 18–45 received a preparation or placebo for 28 days. Stroop-task speed improved 60 minutes after the initial intake, while many cognitive measures did not improve. Subjective stress showed a trend with p=0.051, rather than a clear conventional statistical result. Other outcomes favored placebo. The authors reported both favorable and unfavorable findings; highlighting only the Stroop result would hide the uncertainty introduced by many comparisons and a small sample.[5]
A later acute study found no overall cognitive benefit
The 2025 crossover experiment included 18 healthy adults aged 18–35. Ninety minutes after fruiting-body extract or a matched drink, overall cognition and mood composites did not differ significantly. A pegboard task improved. This differs from a uniform alertness or memory benefit and cannot settle the effects of months of use. Two authors worked for a company using lion’s mane in its products.[6]
Mood questionnaires need their own interpretation
A 2010 randomized study assigned 30 women to mushroom-containing or placebo cookies for four weeks. Depression and general-complaint scores improved within the mushroom group; selected complaint items differed between groups, while several others only tended to differ. An improvement from a person’s starting score is not the same as a reliable advantage over placebo. Participants were not a representative treatment population for diagnosed major depression or an anxiety disorder, so the experiment does not establish either indication or explain the mechanism.[7]
The muffin study provides a useful contrary result
Grozier and colleagues studied 24 healthy college-age adults for four weeks using mushroom-containing or matched muffins. They measured fuel oxidation and cognition around a fatiguing exercise test. No statistically significant improvement appeared in metabolic flexibility or the tested cognitive markers. These tasks and food delivery differ from the other trials, so the null result neither disproves every hypothesis nor supports a universal benefit. It shows why results must retain their preparation, population, measurement and timeframe.[8]
Food history does not settle supplement safety
LiverTox’s January 2024 assessment found no convincing association with clinically apparent liver injury. It also describes gastrointestinal symptoms and a reported hypersensitivity reaction. Small studies cannot reliably detect rare harms, and absence of a recognized liver signal does not establish every extract’s safety or compatibility with medicines. The available assessment does not establish safety for pregnancy, children or combinations of multiple supplements.[1]
What would make the evidence more convincing?
The 2023 pilot tested many outcomes and found both favorable and unfavorable results. Replication with predefined outcomes would help separate genuine effects from practice on repeated tests, participant expectations and random variation. A positive laboratory task is incomplete evidence for years of preserved cognition. This selected-source search is not exhaustive and does not determine which retail product, if any, reproduces a trial result.[5]
References
- Lion's Mane
Official safety review
NIDDK LiverTox · Content/publication date: 2024
Accessed: 2026-10-14 UTC · Selected original full-text methods, results and limitations inspected; no independent systematic appraisal
Cited sections: Overview, fungal description, laboratory versus human evidence, gastrointestinal effects, hypersensitivity and liver-injury limitationsCanonical page challenge-blocked; the same original record was inspected at /sites/books/NBK599740/. LiverTox has a likely unit typo in a dose sentence; it is not repeated.
- Improving effects of the mushroom Yamabushitake on mild cognitive impairment: a double-blind placebo-controlled clinical trial
Randomized controlled trial
Mori and colleagues · Content/publication date: 2009
Accessed: 2026-10-14 UTC · Original indexed abstract and bibliographic record inspected; attempted page open was unavailable or challenge-blocked; full text not independently inspected
Cited sections: 30 participants, HDS-R-based scale, 16 weeks and four-week post-intake declineIndexed original abstract retrieved; page open returned a shell. Journal issue March 2009, not the 2026 check date.
- Improvement of cognitive functions by oral intake of Hericium erinaceus
Randomized controlled trial
Saitsu and colleagues · Content/publication date: 2019
Accessed: 2026-10-14 UTC · Selected original full-text methods, results and limitations inspected; no independent systematic appraisal
Cited sections: 31 analyzed, 12 weeks; age-adjusted MMSE interaction p0.029, Benton and S-PA nulls; low-MMSE exclusionPublisher abstract and seven-page original PDF inspected. LiverTox’s summary does not preserve the age-adjusted interaction; guide follows original PDF and avoids prevention language.
- Prevention of Early Alzheimer’s Disease by Erinacine A-Enriched Hericium erinaceus Mycelia Pilot Double-Blind Placebo-Controlled Study
Randomized pilot trial
Li and colleagues · Content/publication date: 2020
Accessed: 2026-10-14 UTC · Selected original full-text methods, results and limitations inspected; no independent systematic appraisal
Cited sections: Cultivated enriched mycelia; 49 randomized; Table 2 intergroup versus intragroup cognitive outcomes; adverse events; conflictsPositive title and within-group results are not accepted as evidence of between-group dementia prevention.
- The Acute and Chronic Effects of Lion’s Mane Mushroom Supplementation on Cognitive Function, Stress and Mood in Young Adults
Randomized pilot trial
Docherty, Doughty and Smith · Content/publication date: 2023
Accessed: 2026-10-14 UTC · Original indexed abstract and selected indexed results passages inspected; PMC challenge and publisher rate limit prevented independent full-text inspection
Cited sections: 41 adults; Stroop speed; p=0.051 subjective-stress trend; mixed positive/negative outcomesSome secondary summaries present the stress trend as an established benefit; guide does not.
- Acute effects of a standardised extract of Hericium erinaceus on cognition and mood in healthy younger adults
Randomized crossover trial
Surendran and colleagues · Content/publication date: 2025
Accessed: 2026-10-14 UTC · Selected original full-text methods, results and limitations inspected; no independent systematic appraisal
Cited sections: 18 participants, extract preparation, global composites null, pegboard result, exclusions and company affiliationsOriginal methods, results and conflicts inspected; acute findings do not answer chronic efficacy.
- Reduction of depression and anxiety by 4 weeks Hericium erinaceus intake
Randomized controlled trial
Nagano and colleagues · Content/publication date: 2010
Accessed: 2026-10-14 UTC · Original PubMed abstract and publisher abstract inspected; full study PDF not independently inspected
Cited sections: 30 women, cookies, CES-D and complaint outcomes; within-group versus between-group findingsThe title is broader than the selective between-group findings in the abstract.
- Four Weeks of Hericium erinaceus Supplementation Does Not Impact Markers of Metabolic Flexibility or Cognition
Placebo controlled trial
Grozier and colleagues · Content/publication date: 2022
Accessed: 2026-10-14 UTC · Original indexed abstract and selected indexed PMC methods/results inspected; direct full-text open challenge-blocked
Cited sections: 24 college-age adults, matched muffins, four weeks, exercise-metabolism and cognitive null resultsCognition was secondary to metabolic-flexibility assessment; limited task coverage retained.
Scope & review
- Population
- Adults in small cognition or mood studies, including specific mild-impairment and mild-Alzheimer groups
- Exposure or intervention
- Food, dried fruiting-body powder, specified extracts and cultivated enriched mycelia
- Comparison
- Source-specific placebo controls; differing tissues, processing methods and cognitive tasks
- Outcomes
- Cognitive test performance, subjective stress and mood, daily-living scales and adverse events
- Timeframe
- Source-specific acute experiments and trials lasting weeks to months; long-term clinical outcomes remain unresolved
- Jurisdiction
- Selected international human research and original reviews; US liver-safety information is identified; product rules differ by jurisdiction
Selected-source educational explanation. Official guidance, original study findings and editorial interpretation are distinguished. No exhaustive search, independent systematic synthesis or qualified medical review has been completed.
Sources checked on their individual access dates. Selected sources were checked; ongoing surveillance and qualified review have separate statuses on the coverage page.
Revision history
- 2026-10-14 UTC: Added a bounded mushroom-supplement explanation; qualified clinical and methods review remains pending.
- 2026-10-14 UTC: Clarified new authored question labels and bounded evidence summaries after independent navigation probes; earlier articles and matcher unchanged.
What this article still leaves open
- Does a replicated preparation improve everyday function beyond test performance?
- Does any preparation prevent dementia diagnoses over years?
- What are long-term safety and medicine-interaction risks in underrepresented groups?
Suggest a correction
Submit a content correction to the editorial queue, or download a local note. Leave out personal medical details. Submitted text is stored privately with a browser receipt session and is visible to this browser and the editor. Clearing cookies removes access to your submission history. This is not an account or a medical service.
Your submitted corrections for this article
Explore the topic map
Browse the health domains connected to this article. The map also identifies topics whose articles remain unwritten.