Whole Powder
Dried, ground fruiting body powder — the form used in the mild cognitive impairment and Alzheimer's disease clinical trials.
Powder
Culinary & Medicinal Fungus · Traditional Chinese Medicine
Biological Overview
Hericium erinaceus is a curiously shaped fungus, distinguished by long, white, hanging spines rather than gills or pores, growing on dead hardwood. Also known as Yamabushitake, bearded tooth, monkey head, satyr's beard, or pom pom mushroom, it has been used for centuries in Traditional Chinese Medicine, generally as a tonic to relieve stress, anxiety and support digestive health.
FamilyHericiaceae
Growth SubstrateDead Hardwood
Key CompoundsErinacines, Hericenones
Liver Safety SignalNone Documented
Botanical Classification
Taxonomy & Identification
- Latin Name
- Hericium erinaceus (Bull.) Persoon
- Family
- Hericiaceae
- Common Names
- Lion's Mane, Yamabushitake, Bearded Tooth, Monkey Head
- Parts Used
- Fruiting body & mycelium
- Habitat
- Northern Hemisphere, on dead hardwood
Ethnobotany & Traditional Use
History & Tradition
Hericium erinaceus has been used by Traditional Chinese Medicine for centuries, generally as a tonic to relieve stress, anxiety and depression, and traditionally associated with digestive health and nerve regeneration.
Modern pharmacological interest began with the discovery of hericenones in the fruiting body and erinacines in the mycelium — two distinct classes of compounds capable of stimulating nerve growth factor (NGF) synthesis — and has since expanded into a substantial body of preclinical and, increasingly, human clinical research on cognition and neuroprotection.
The Key Compounds
Erinacines & Hericenones — Deep Dive
Two distinct terpenoid classes, unique to this fungus, anchor nearly every documented neurotrophic effect: erinacines from the mycelium, hericenones from the fruiting body.
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NGF Gene Expression Induction
Hericium erinaceus increases expression of the Nerve Growth Factor (NGF) gene in human astrocytoma cells. [6]
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Neurite Outgrowth Signaling
Hericenones isolated from cultivated fruiting bodies demonstrate NGF-mediated neurite outgrowth via MEK/ERK and PI3K-Akt signaling pathways in PC12 cells. [2]
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Myelin Synthesis Stimulation
Extract promotes development of cerebellar cells in culture and stimulates myelin synthesis in vitro. [7]
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Erinacine A Neuroprotection
Erinacine A protects against MPTP-induced neurotoxicity through modulation of ER stress and the apoptosis cascade. [5]
Available Preparations
Parts Used & Available Forms
Both the fruiting body and mycelium are used, most commonly as powder or standardized dry extract.
Standardized Dry Extract
Concentrated dry extract, often standardized to beta-glucan or erinacine A content.
Dry Extract · Standardized
Mycelium Extract
Erinacine-rich mycelium extract, the form used in the 49-week Alzheimer's disease pilot trial. [18]
Mycelium Extract
Clinical Dosimetry
Dosages
Traditional dosing and the doses used across the major clinical trials.
Phytochemistry
Composition
Documented composition of the fungus, the sole category with described components in the primary source.
PolysaccharidesBeta-glucans
Present
Sugar AlcoholsD-arabinitol, D-threitol
Present
Fatty AcidsPalmitic acid
Present
HericenonesHericenones C, D and E — found mainly in the fruiting body
Key Compound
ErinacinesCyathane-type diterpenoids, including erinacine A — found mainly in the mycelium
Key Compound
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Neurotrophic & Neuroprotective
Usable in nerve regeneration and reduces apoptosis of nerve cells. [1][2][3][4]
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Neuronal Anti-Inflammatory
Documented neuroprotective and anti-inflammatory activity specific to neuronal tissue. [5]
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NGF Gene Expression
Increases Nerve Growth Factor gene expression in human 1321N1 astrocytoma cells. [6]
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Myelin Synthesis Support
Promotes cerebellar cell development in culture and stimulates myelin synthesis in vitro. [7]
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Antidiabetic
Documented hypoglycemic effect of the extract. [8]
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Gastroprotective
Protective against experimental gastric ulcer, via upregulation of HSP70 and downregulation of BAX protein. [9]
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Anti-Helicobacter pylori
Documented in vitro anti-H. pylori activity, including via a bismuth-polysaccharide complex. [10][11]
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Prebiotic & Antioxidant
Water- and alkali-soluble polysaccharides show both prebiotic and antioxidant activity. [12]
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Anticancer, Immunomodulant & Hypolipidemic Potential
Broad documented potential across anticancer, immunomodulant, hypolipidemic and antioxidant activity. [13]
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Human Cognitive Performance
Improved Stroop task speed following a single dose, and a trend toward reduced subjective stress after 28 days, in healthy young adults. [16]
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Long-Term Human Safety & Cognitive Benefit
A 49-week randomized trial in mild Alzheimer's disease patients found improved Mini-Mental State Examination scores versus placebo. [18]
Clinical Applications
Clinical Indications
Documented uses, including one the primary source itself flags as uncertain.
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Cognitive Decline
Primary Documented Indication
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Dementia (Alzheimer's?)
Flagged Uncertain in Primary Source
- Alzheimer's disease: the primary source itself marks this with a question mark ("??") — a preliminary, not established, indication despite the supportive 2020 pilot trial. [15]
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Nerve Regeneration
Traditional & Preclinical
- Nerve regeneration after trauma: traditional indication, supported by preclinical peripheral nerve injury research. [3]
Pharmacodynamics
Mode of Action
The documented mechanisms behind erinacine and hericenone neurotrophic activity — this section was not developed in the primary source and is built entirely from the peer-reviewed studies below.
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Myelination Support
Extract stimulates myelin synthesis and cerebellar cell development in vitro, a mechanism distinct from but complementary to NGF induction. [7]
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Reduced Neuronal Apoptosis
Erinacine A protects against MPTP-induced neurotoxicity by modulating endoplasmic reticulum stress and interrupting the apoptosis cascade. [5]
Clinical Safety
Safety, Interactions & Precautions
The primary source left this section undeveloped — everything below is drawn from formal toxicology studies, human trials and a documented case report.
Adverse Effects
- Most common: mild gastrointestinal discomfort, nausea and abdominal discomfort, reported across multiple human trials. [14][18]
- Uncommon: skin rash — 4 participants withdrew from the 49-week Alzheimer's trial due to abdominal discomfort, nausea and skin rash; no other adverse events were reported among remaining participants. [18]
- Formal toxicology: a GLP-compliant, OECD-guideline 90-day rat study found no treatment-related adverse effects at doses up to 2,000 mg/kg/day, and the extract was non-genotoxic. [19]
Interactions & Precautions
- Cancer treatment / chemotherapy: one case report described liver enzyme elevation (grade 3 cytolysis) and cholestasis in a cancer patient on chemotherapy who was self-medicating with a mushroom powder supplement containing both Agaricus blazei and Hericium erinaceus. Investigators attributed the reaction primarily to the Agaricus blazei component, not lion's mane, but the case underscores the need to disclose any mushroom supplement to an oncology team. [20]
- Liver safety: lion's mane itself has not been linked to serum enzyme elevations or clinically apparent liver injury in controlled studies. [21]
- Mushroom allergy: as with any fungal product, individuals with known mushroom allergies should exercise caution.
Clinical Disclaimer: This monograph is for educational and professional reference only. It does not constitute medical advice, diagnosis, or treatment guidance. Always consult a qualified healthcare provider before initiating any phytotherapeutic regimen, particularly if you are undergoing cancer treatment, are pregnant, or have existing health conditions.
Common Questions
Frequently Asked Questions
What is Lion's Mane traditionally used for?
Lion's Mane (Hericium erinaceus) has been used by Traditional Chinese Medicine, generally as a tonic for stress, anxiety and digestive health, and traditionally associated with nerve regeneration.
Which part of the mushroom is used medicinally?
Both the fruiting body and the mycelium are used, most commonly as a dried powder or a standardized dry extract.
What are erinacines and hericenones?
Erinacines and hericenones are two distinct classes of terpenoid compounds unique to Hericium erinaceus. Erinacines are found mainly in the mycelium and hericenones mainly in the fruiting body; both stimulate nerve growth factor (NGF) synthesis and are considered responsible for the mushroom's neurotrophic effects.
Does Lion's Mane improve cognitive function in humans?
The evidence is mixed but promising. A 16-week trial in adults with mild cognitive impairment found improved cognitive scores. A 49-week pilot trial in patients with mild Alzheimer's disease found benefits on some cognitive measures. However, acute trials in healthy young adults have shown more modest, task-specific effects rather than broad cognitive improvement.
Is Lion's Mane safe?
Toxicology studies in animals found no treatment-related adverse effects at doses up to 2,000 mg/kg/day over 90 days, and the extract was non-genotoxic. In human trials, the most common side effects are mild gastrointestinal discomfort, nausea, and occasional skin rash. Lion's Mane has not been linked to serum enzyme elevations or clinically apparent liver injury in controlled studies.
Can Lion's Mane interact with cancer treatment?
One case report described liver enzyme elevation and cholestasis in a cancer patient on chemotherapy who was self-medicating with a multi-mushroom supplement containing both Agaricus blazei and Hericium erinaceus. The investigators attributed the reaction primarily to the Agaricus blazei component. Even so, anyone undergoing cancer treatment should discuss any mushroom supplement with their oncologist before use.
Does Lion's Mane help with nerve regeneration?
Preclinical research documents neuroregenerative potential in peripheral nerve injury models and demonstrates that Hericium erinaceus extract stimulates myelin synthesis in cultured cerebellar cells. Traditional use for nerve regeneration after trauma exists, but robust human clinical trials specifically for nerve injury are still lacking.
Is Lion's Mane proven to treat Alzheimer's disease?
No, this remains an open question, flagged as uncertain even in phytotherapy references. A single 49-week pilot, double-blind, placebo-controlled trial found some cognitive benefit in patients with mild Alzheimer's disease, which is a promising but preliminary result, not definitive proof of an effective treatment.
Primary Literature
Bibliography
This monograph draws on the primary botanical source plus substantial additional peer-reviewed literature, given how little the original entry covered on history, mode of action and safety — every added claim is linked to a verifiable, named source below.
↑1. Lai PL, Naidu M, Sabaratnam V, Wong KH, David RP, Kuppusamy UR, Abdullah N, Malek SN. Neurotrophic properties of the Lion's mane medicinal mushroom, Hericium erinaceus (Higher Basidiomycetes) from Malaysia. Int J Med Mushrooms. 2013;15(6):539-54. PubMed PMID:24266378 →
↑2. Phan CW, Lee GS, Hong SL, Wong YT, Brkljača R, Urban S, Abd Malek SN, Sabaratnam V. Hericium erinaceus (Bull.: Fr) Pers. cultivated under tropical conditions: isolation of hericenones and demonstration of NGF-mediated neurite outgrowth in PC12 cells via MEK/ERK and PI3K-Akt signaling pathways. Food Funct. 2014 Nov 19;5(12):3160-9. PubMed PMID:25288148 →
↑3. Wong KH, Naidu M, David RP, Bakar R, Sabaratnam V. Neuroregenerative potential of lion's mane mushroom, Hericium erinaceus (Bull.: Fr.) Pers. (higher Basidiomycetes), in the treatment of peripheral nerve injury (review). Int J Med Mushrooms. 2012;14(5):427-46. PubMed PMID:23510212 →
↑4. Park YS, Lee HS, Won MH, Lee JH, Lee SY, Lee HY. Effect of an exo-polysaccharide from the culture broth of Hericium erinaceus on enhancement of growth and differentiation of rat adrenal nerve cells. Cytotechnology. 2002 Sep;39(3):155-62. PubMed PMID:19003308 →
↑5. Kuo HC, Lu CC, Shen CH, Tung SY, Hsieh MC, Lee KC, Lee LY, Chen CC, Teng CC, Huang WS, Chen TC, Lee KF. Hericium erinaceus mycelium and its isolated erinacine A protection from MPTP-induced neurotoxicity through the ER stress, triggering an apoptosis cascade. J Transl Med. 2016 Mar 18;14:78. PubMed PMID:26988860 →
↑6. Mori K, Obara Y, Hirota M, Azumi Y, Kinugasa S, Inatomi S, Nakahata N. Nerve growth factor-inducing activity of Hericium erinaceus in 1321N1 human astrocytoma cells. Biol Pharm Bull. 2008 Sep;31(9):1727-32. PubMed PMID:18758067 →
↑7. Kolotushkina EV, Moldavan MG, Voronin KY, Skibo GG. The influence of Hericium erinaceus extract on myelination process in vitro. Fiziol Zh. 2003;49(1):38-45. PubMed PMID:12675022 →
↑8. Wang JC, Hu SH, Wang JT, Chen KS, Chia YC. Hypoglycemic effect of extract of Hericium erinaceus. J Sci Food Agric. 2005;85(4):641-646.
↑9. Wong JY, Abdulla MA, Raman J, Phan CW, Kuppusamy UR, Golbabapour S, Sabaratnam V. Gastroprotective effects of Lion's Mane mushroom Hericium erinaceus (Bull.:Fr.) Pers. (Aphyllophoromycetideae) extract against ethanol-induced ulcer in rats. Evid Based Complement Alternat Med. 2013;2013:492976. Full Text →
↑10. Shang X, Tan Q, Liu R, Yu K, Li P, Zhao GP. In vitro anti-Helicobacter pylori effects of medicinal mushroom extracts, with special emphasis on the Lion's Mane mushroom, Hericium erinaceus (higher Basidiomycetes). Int J Med Mushrooms. 2013;15(2):165-74. PubMed PMID:23557368 →
↑11. Zhu Y, Chen Y, Li Q, Zhao T, Zhang M, Feng W, Takase M, Wu X, Zhou Z, Yang L, Wu X. Preparation, characterization, and anti-Helicobacter pylori activity of Bi3+-Hericium erinaceus polysaccharide complex. Carbohydr Polym. 2014 Sep 22;110:231-7. PubMed PMID:24906751 →
↑12. Zhuang H, Dong H, Zhang X, Feng T. Antioxidant activities and prebiotic activities of water-soluble, alkali-soluble polysaccharides extracted from the fruiting bodies of the fungus Hericium erinaceus. Polymers (Basel). 2023 Oct 20;15(20):4165. PubMed PMID:37896408 →
↑13. Khan MA, Tania M, Liu R, Rahman MM. Hericium erinaceus: an edible mushroom with medicinal values. J Complement Integr Med. 2013 May 24;10. PubMed PMID:23735479 →
↑14. Mori K, Inatomi S, Ouchi K, Azumi Y, Tuchida T. Improving effects of the mushroom Yamabushitake (Hericium erinaceus) on mild cognitive impairment: a double-blind placebo-controlled clinical trial. Phytother Res. 2009 Mar;23(3):367-72. PubMed PMID:18844328 →
↑15. Kawagishi H, Zhuang C. Compounds for dementia from Hericium erinaceum. Drugs of the Future. 2008;33(2):149.
↑16. Docherty S, Doughty FL, Smith EF. The acute and chronic effects of Lion's Mane mushroom supplementation on cognitive function, stress and mood in young adults: a double-blind, parallel groups, pilot study. Nutrients. 2023 Nov 20;15(22):4842. PubMed PMID:38004235 →
↑17. Surendran G, Saye J, Mohd Jalil SB, Spreadborough J, Duong K, Shatwan IM, Lilley D, Heinrich M, Dodd GF, Surendran S. Acute effects of a standardised extract of Hericium erinaceus (Lion's Mane mushroom) on cognition and mood in healthy younger adults: a double-blind randomised placebo-controlled study. Front Nutr. 2025 Apr 10. Full Text →
↑18. Li IC, Chang HH, Lin CH, Chen WP, Lu TH, Lee LY, Chen YW, Chen YP, Chen CC, Lin DP. Prevention of Early Alzheimer's Disease by Erinacine A-Enriched Hericium erinaceus Mycelia Pilot Double-Blind Placebo-Controlled Study. Front Aging Neurosci. 2020 May 22;12:155. PubMed PMID:32581767 →
↑19. Chen SN, Chang CS, Yang MF, Chen S, Soni M, Mahadevan B. Subchronic toxicity and genotoxicity studies of Hericium erinaceus β-glucan extract preparation. Curr Res Toxicol. 2022 Mar 11;3:100068. PubMed PMID:35341120 →
↑20. Strobbe S, et al. Case report: cytolysis and hepatic cholestasis associated with a mushroom powder-based supplement containing Agaricus blazei Murrill and Hericium erinaceus in a patient undergoing chemotherapy. 2024. PubMed PMID:39223928 →
↑21. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), NIH. LiverTox: Clinical and Research Information on Drug-Induced Liver Injury — Lion's Mane. Full Text →