What Lion's Mane is
Lion's mane, or Hericium erinaceus (English names — Lion's Mane, Yamabushitake, Pom Pom), is a wood-decay saprotroph from the Hericiaceae family. The fruiting body is spherical, white or cream, with long hanging "spines" on which spores form. It grows on dead and weakened hardwood in temperate forests of Eurasia and North America. The species card with the botanical description is at Lion's mane.
This material adapts the editorial review "Lion's Mane for Your Brain and Body" (MushroomReferences.com, March 2025), which collects data on the fungus's neurotrophic, immune and metabolic effects.
Where H. erinaceus keeps its active substances
Two main groups of low-molecular-weight compounds account for most of the biological activity:
- Hericenones (hericenones A–J) — mainly in the fruiting body.
- Erinacines (erinacines A–S) — mainly in the mycelium.
The review "Neurotrophic properties of the Lion's Mane mushroom" collects data on these compounds' distribution between fruiting body and mycelium and their pharmacological effects in cellular and animal models. For the supplement consumer this means fruiting-body and mycelium products cannot be compared directly — their active-compound profiles differ.
What Lion's Mane does for the brain
NGF and neuroplasticity
In a series of in-vitro studies, H. erinaceus extracts increased NGF (Nerve Growth Factor) production in astrocytes and neuroblastoma cell lines. The effect was seen both with standardized hericenone fractions and with water-alcohol mycelial extracts containing erinacines. This justified behavioural and clinical studies.
Cognitive function
In a study published in Nutrients (MDPI, 2023), oral administration of a standardized H. erinaceus extract in mice improved novel-object recognition and was accompanied by increased neurogenesis markers in the hippocampal dentate gyrus, including BDNF-immunoreactive cells.
Human clinical data are small but reproducible: in healthy volunteers and patients with mild cognitive impairment, improvement on short-term memory and attention scales was noted after 8–12 weeks of intake. A detailed breakdown is in Lion's mane and neurogenesis.
Mood and sleep
Several small RCTs recorded reduced subjective anxiety and improved sleep quality. The effect size is moderate, samples in the dozens. These data intersect with Beta-glucans and immunity in the shared mechanisms of neuro-immune modulation.
What Lion's Mane does for the body
Immune modulation
The polysaccharide fraction of H. erinaceus belongs to the β-(1→3)/(1→6)-glucans. In laboratory and animal models these polysaccharides activated macrophages, increased cytokine production and NK-cell activity. Human clinical data are isolated and small; the general logic is in Beta-glucans and immunity and the Mushrooms and immunity topic.
GI tract and microbiota
In preclinical models, H. erinaceus extracts reduced gastritis severity and normalized gut-microbiota composition. These data fit the general pattern described for β-glucan-bearing wood-decay fungi.
Metabolic effects
In animal models of metabolic syndrome, H. erinaceus extracts improved lipid-profile measures and lowered systemic inflammation markers. Translation to humans requires confirmation in clinical trials.
Human clinical studies (2020–2025)
Summary by design and results:
- Cognitive outcomes — several RCTs (n = 30–80) showed moderate improvement on memory and attention scales after 8–12 weeks. Small but statistically significant effect.
- Subjective mood and sleep scales — reduced anxiety and improved sleep quality; moderate effect, samples in the dozens.
- Plasma NGF/BDNF biomarkers — data are contradictory: peripheral BDNF does not directly reflect CNS processes, complicating interpretation.
- Safety — in short-term studies side effects are rare (occasionally mild GI discomfort). Long-term safety continues to be studied.
The overall picture of clinical work is in the PubMed collection.
What is important to keep in mind
- Standardization is critical. Different commercial products contain different hericenone/erinacine ratios, different raw material (fruiting body or mycelium) and extraction methods. This complicates comparison across studies.
- Effects in healthy people. Most positive clinical data come from relatively healthy volunteers with mild cognitive complaints. Data in patients with an established dementia diagnosis remain preliminary.
- It is a dietary supplement. H. erinaceus extracts are registered as dietary supplements or functional foods and are widely used in East Asian cuisine and folk medicine.
Related materials
- Species card: Lion's mane
- Narrower topic: Lion's mane and neurogenesis
- Catalog: Mushroom catalog
- Mechanisms: Beta-glucans and immunity, topic Mushrooms and immunity
- Other wood-decay fungi: Reishi, Agarikon, Chaga
- Source: Sources