Abstract

The article explores the growing body of scientific evidence supporting the mental health benefits of Lion’s Mane (Hericium erinaceus) and other functional mushrooms. Focusing on Lion’s Mane, the article reviews its traditional uses and highlights emerging clinical findings suggesting potential neurotrophic, mood-supporting and cognitive-related effects. Central mechanisms include stimulation of nerve growth factor (NGF), elevation of pro brain-derived neurotrophic factor (proBDNF) and reduction of neuroinflammation. Key clinical trials show improvements in mood, anxiety, and cognitive function in both healthy individuals and at-risk populations. The article also contextualizes Lion’s Mane among other adaptogenic fungi like Reishi and Cordyceps, while advocating for future research to validate its role in integrative mental health care.

Introduction

In recent years, functional mushrooms have emerged as a promising frontier in natural approaches to mental wellness. Once largely relegated to traditional medicine, certain mushroom species, including Lion’s Mane (Hericium erinaceus), are now the focus of serious scientific investigation. With rising rates of stress, anxiety, and cognitive decline, researchers and health practitioners alike are turning to these natural products for their supporting cognitive function and mood-enhancing potential. Unlike psychedelic mushrooms, which remain restricted in many jurisdictions, Lion’s Mane and other adaptogenic mushrooms are legal, well-tolerated, and increasingly popular as daily supplements.

This essay explores the latest clinical evidence, the biological mechanisms, and the growing scientific consensus surrounding functional mushrooms’ potential for mental health. The objective is to evaluate current evidence on Lion’s Mane’s effects on mood, cognition, and neuroplasticity, particularly through its stimulation of nerve growth factor (NGF) and brain-derived neurotrophic factor (BDNF). Here we are focusing on Lion’s Mane, but also highlighting contributions from Reishi, Cordyceps, and others. Central to this discussion is a 2023 review study published in the journal Nutrients, which underscores both the promise and limitations of current Lion’s Mane research.

Traditional Use and Emerging Scientific Interest

Lion’s Mane has been used for centuries in East Asian medicine, especially in China and Japan, where it was traditionally used to support cognitive function , longevity, and general vitality. Traditional uses also included treatment of “QI deficiency,” fatigue, and poor memory.

Only in the past two decades has modern research begun to validate these uses. The surge in interest is driven by Lion’s Mane’s unique bioactive compounds, notably Hericenones, which stimulate nerve growth factor (NGF), an essential protein in the development, survival, and function of neurons.

Other mushrooms, such as Reishi (Ganoderma lucidum) and Cordyceps (Cordyceps militaris), also possess neuroprotective, anti-inflammatory, and stress-reducing properties, though Lion’s Mane remains the best-studied in human clinical trials for cognitive and mood-related outcomes.

The Neurobiology of Lion’s Mane

NGF and Neurogenesis

Lion’s Mane is one of the few natural substances shown to stimulate the synthesis of nerve growth factor (NGF), a protein crucial for the maintenance and regeneration of neurons. Hericenone B, found in the fruiting body, exhibits NGF-inducing activity in vitro and in animal models. NGF plays a pivotal role in the growth of hippocampal neurons, central to memory, learning, and emotional regulation (1).

Brain-Derived Neurotrophic Factor (BDNF)

Recent clinical trials also suggest that Lion’s Mane may elevate proBDNF (the precursor to brain-derived neurotrophic factor) another key molecule involved in neuroplasticity, stress adaptation, and mood stabilization. This may explain the mushroom’s potential in reducing anxiety and depressive symptoms.

Anti-inflammatory and Antioxidant Properties

Chronic inflammation and oxidative stress are known contributors to mental health disorders. Lion’s Mane possesses antioxidant and anti-inflammatory properties, helping to support normal inflammatory balance, particularly in the hippocampus and prefrontal cortex, areas often disrupted in mood disorders (2).

Clinical Evidence: Human Trials of Lion’s Mane

Randomized Trial in Menopausal Women

It is important to note that clinical outcomes vary depending on extract type, standardization, and dosage, which may impact the reproducibility and comparability of results across studies.

In one of the earliest human studies, postmenopausal women consumed cookies containing 2 g/day of Lion’s Mane fruiting body powder for four weeks. The placebo-controlled trial found significant reductions in depression and anxiety scores, as measured by the Center for Epidemiologic Studies Depression Scale (CES-D) and Indefinite Complaints Index (ICI) (3). This suggested a mild but measurable mood-enhancing effect.

Eight-Week Supplementation in Overweight Adults

A more recent randomized controlled trial (RCT) in overweight and obese individuals supplemented participants with 1.5 g/day of Lion’s Mane fruiting body extract over eight weeks. The study, published in Frontiers in Nutrition in 2025, found improvements in anxiety, depression, and sleep quality, with corresponding increases in proBDNF levels, indicating a possible mechanistic link to neuroplasticity pathways (4). No adverse effects were reported.

Acute and Chronic Use in Healthy Adults

A double-blind, placebo-controlled pilot study in healthy young adults (aged 18–45) evaluated acute (60-minute) and chronic (28-day) use of 1.8 g/day Lion’s Mane fruiting body powder. Results showed improved performance on cognitive tests (e.g., the Stroop test) at 60 minutes and a near-significant reduction in subjective stress after four weeks (p = 0.051). These findings support the hypothesis that short-term supplementation may benefit cognitive processing and perceived stress (5) .

Summary from the Nutrients 2023 Review

A comprehensive review published in Nutrients in 2023 summarized existing trials and highlighted the mushroom’s therapeutic potential. The authors concluded:

“Given the current evidence, Lion’s Mane mushrooms may have the potential to elicit both cognitive and mood effects through various biological pathways (6).”

Other Functional Mushrooms with Mental Health Potential

Reishi (Ganoderma lucidum)

Reishi mushrooms are rich in triterpenes and beta-glucans, which exhibit stress-supporting and adaptogenic properties. A small human trial found Reishi supplementation improved fatigue and irritability in breast cancer survivors. Though fewer studies focus on mental health directly, its traditional use as a calming agent is well-documented.

Cordyceps (Cordyceps militaris and sinensis)

Cordyceps may support energy metabolism and stress resilience. Animal studies have shown mood-balance effects through modulation of dopamine and serotonin pathways. Its neuroprotective qualities may also benefit cognitive aging, although clinical trials in humans remain sparse.

Comparing Lion’s Mane to Conventional Approaches

Unlike pharmaceuticals, which target specific neurotransmitters (e.g., SSRIs increasing serotonin), Lion’s Mane operates more broadly, modulating NGF/BDNF, reducing neuroinflammation, and supporting neuronal function and plasticity. While this may lead to slower onset, it may be associated with a lower incidence of side effects and broader benefits in cognitive function, emotional balance, and long-term brain health.

However, it’s crucial to recognize that Lion’s Mane is not a substitute for psychiatric medications in moderate-to-severe conditions. It may be better understood as a complementary approach to support cognitive function and emotional well-being, particularly in individuals experiencing mild mood disturbances or age-related cognitive changes.

Future Directions

To fully establish the role of Lion’s Mane and other functional mushrooms in mental health, future research should focus on:

• Standardization of extract types and dosages
• Neuroimaging studies to track changes in brain structure/function
• Comparative trials vs. placebo and vs. existing nootropics or antidepressants
• Diverse populations, including older adults, individuals with mild cognitive impairment, and those under chronic stress

Moreover, combination studies, pairing Lion’s Mane with mindfulness, exercise, or dietary interventions, could offer insights into synergistic approaches to brain health.

Conclusion

The growing body of research on Lion’s Mane and other functional mushrooms marks a significant shift in how we think about natural solutions for mental wellness. Backed by traditional wisdom and modern clinical science, Lion’s Mane offers a unique combination of neurotrophic, antioxidant, and mood-modulating properties.

While the field is still developing, existing studies suggest that daily supplementation with Lion’s Mane may support mood, cognitive performance, and overall emotional resilience. Importantly, it does so without the risks associated with pharmacological treatments or illegal substances.

As scientists continue to unravel the complex relationships between neurobiology, inflammation, and mood, mushrooms like Lion’s Mane stand poised to play a significant role in the future of integrative mental healthcare.