What Does the Research Say About Lion's Mane Mushroom?

Educational content: This article summarizes peer-reviewed scientific research on Hericium erinaceus (lion's mane mushroom). These statements have not been evaluated by the Food and Drug Administration. Lion's mane is a food — it is not intended to diagnose, treat, cure, or prevent any disease or medical condition. Consult your physician regarding any health concerns.

Lion's mane (Hericium erinaceus) is the only edible mushroom known to contain hericenones and erinacines — terpenoid compounds with demonstrated ability to cross the blood-brain barrier and stimulate the synthesis of Nerve Growth Factor, a protein studied for its role in neuronal maintenance and repair. A 2025 systematic review of 26 human studies documented neuroprotective, antioxidant, and anti-inflammatory properties across multiple health domains.

On this page

• What makes lion's mane biologically unique

• Brain health and cognitive function

• Mood and neuroinflammation

• Neurodegeneration research

• Immune function

• What this means for your plate

What makes lion's mane biologically unique?

Most functional foods earn that designation through their nutritional profile — vitamins, minerals, fiber, antioxidants. Lion's mane earns it through a class of compounds found nowhere else in the food supply. Hericenones, derived from the mushroom's fruiting body, and erinacines, found in its mycelium, are small-molecule terpenoids that directly stimulate the synthesis of Nerve Growth Factor inside the body.

Nerve Growth Factor (NGF) is a neuropeptide studied for its role in the development, maintenance, and survival of neurons. The challenge with NGF as a research focus has always been delivery: the protein itself cannot cross the blood-brain barrier. Lion's mane delivers the molecules that trigger NGF synthesis from within the brain itself. Erinacine A and erinacine S have been demonstrated to cross the blood-brain barrier in animal studies, stimulating endogenous NGF production.

This mechanism is what separates lion's mane from the broader category of adaptogenic mushrooms. Reishi, chaga, and cordyceps offer meaningful properties through immune modulation and antioxidant activity. Lion's mane does those things too — and it directly interacts with the brain's own neurotrophin signaling system.

What does the clinical evidence show for brain health?

The most cited human trial on lion's mane and cognitive function was conducted in Japan and published in 2009. Thirty adults aged 50 to 80 with mild cognitive impairment were randomized to receive either 3 grams of lion's mane powder daily or placebo for 16 weeks. At weeks 8, 12, and 16, the treatment group showed significantly higher scores on the Revised Hasegawa Dementia Scale compared to placebo. Cognitive scores declined after the supplement was discontinued.

More recent research has extended these findings to healthy populations. A 2025 double-blind randomized placebo-controlled trial published in Frontiers in Nutrition evaluated acute cognitive effects of a standardized lion's mane extract in healthy adults. Participants showed measurable improvements in performance on cognitive assessments within hours of a single dose.

In a double-blind, parallel-group, placebo-controlled trial, 30 Japanese subjects aged 50–80 with mild cognitive impairment received 3 g/day of Hericium erinaceus for 16 weeks. The treatment group showed significantly increased cognitive scores at weeks 8, 12, and 16 compared to placebo. Scores declined following discontinuation. Mori et al., Phytotherapy Research, 2009.

A double-blind randomized placebo-controlled study of healthy younger adults found that a standardized extract of Hericium erinaceus produced measurable acute improvements in cognitive performance. Surendran et al., Frontiers in Nutrition, 2025.

Mood and neuroinflammation

Lion's mane compounds act not only on NGF pathways but also on BDNF — Brain-Derived Neurotrophic Factor — another neurotrophin studied for its role in mood regulation. By supporting neurotrophin signaling, lion's mane addresses one of the biological substrates of mood at the cellular level.

A randomized controlled trial published in Biomedical Research examined the effects of four weeks of lion's mane supplementation in thirty women. The lion's mane group reported significantly lower scores on validated anxiety and irritability scales compared to placebo. The authors attributed the effect to lion's mane's anti-neuroinflammatory properties.

A randomized, double-blind, placebo-controlled study of 30 female subjects found that four weeks of Hericium erinaceus intake resulted in significantly reduced scores on measures of depression and anxiety compared to placebo. Nagano et al., Biomedical Research, 2010.

Neurodegeneration research

A 49-week double-blind placebo-controlled pilot trial of 49 patients with mild Alzheimer's disease was published in Frontiers in Aging Neuroscience in 2020. The treatment group showed significantly less deterioration on cognitive assessment scales compared to placebo. Plasma biomarker analysis showed higher levels of NGF in the treatment group. These are early-stage pilot findings and do not constitute clinical treatment recommendations.

A double-blind placebo-controlled pilot trial of 49 patients with mild Alzheimer's disease found that 49 weeks of erinacine A-enriched Hericium erinaceus mycelia resulted in significantly lower cognitive deterioration compared to placebo, with higher plasma NGF levels in the treatment group. Li et al., Frontiers in Aging Neuroscience, 2020.

Immune function

Lion's mane contains high concentrations of beta-glucans — the same immunomodulating polysaccharides found in oyster mushrooms and other medicinal fungi. These compounds activate natural killer cells, enhance macrophage function, and modulate the immune response. A 2025 systematic review of 26 human studies confirmed anti-tumor activity across multiple cancer cell lines. These findings are preclinical in the cancer context — large-scale human trials have not yet been completed.

A systematic review of 26 studies confirmed that Hericium erinaceus extracts inhibit proliferation in multiple cancer cell lines and demonstrate neuroprotective, antioxidant, and anti-inflammatory effects across human and preclinical studies. Menon et al., Frontiers in Nutrition, 2025.

What this means for your plate

Lion's mane is a food. The compounds responsible for its documented properties, hericenones in particular, are present in the fruiting body. Fresh lion's mane delivers these compounds in their natural food matrix, the same form used in the foundational clinical trials.

Regular inclusion of fresh lion's mane in your diet places you in the dietary pattern that the human clinical evidence was built around. The 2009 Mori trial used 3 grams of dried powder daily — approximately equivalent to one or two servings of fresh mushroom per week.

Continue exploring the Lion's Mane science

• Can Lion's Mane Improve Memory and Focus? What the Clinical Trials Show

• How Lion's Mane Stimulates Nerve Growth Factor — and Why That Matters

• Does Lion's Mane Help with Anxiety and Depression?

• What Does the Research Say About Lion's Mane and Alzheimer's Disease?