Lion’s mane mushroom (Hericium erinaceus) has attracted considerable scientific interest over the past two decades, particularly for its potential effects on neurological function. While much of the public conversation focuses on cognitive performance, a smaller but growing body of research has begun examining whether this fungus may also have a measurable influence on anxiety and mood. The findings are preliminary, but they offer a credible basis for continued investigation.
What Makes Lion’s Mane Neurologically Interesting
The primary compounds of interest in Hericium erinaceus are hericenones (found in the fruiting body) and erinacines (found in the mycelium). Both classes of compound have demonstrated the ability to stimulate nerve growth factor (NGF) synthesis in laboratory settings. NGF is a protein essential to the maintenance, survival, and regeneration of neurons, including those in brain regions associated with mood regulation, such as the hippocampus and prefrontal cortex.
This mechanism has led researchers to hypothesize that lion’s mane may exert indirect effects on anxiety and depressive symptoms, potentially through neuroprotective and neurotrophic pathways rather than direct pharmacological action on neurotransmitter receptors. As with most functional mushroom research, however, the translation from laboratory findings to clinical outcomes remains an active area of study.
Human Studies on Anxiety and Mood
One of the most cited human studies in this area was published in Biomedical Research in 2010. In that trial, 30 women were randomly assigned to receive either Hericium erinaceus-containing cookies or placebo cookies over four weeks. Using validated psychological scales including the Center for Epidemiologic Studies Depression Scale (CES-D) and the Indefinite Complaints Index (ICI), researchers found that participants in the lion’s mane group showed significantly lower depression and irritability scores compared to baseline. Notably, subcategories including “anxious” and “irritating” trended lower in the treatment group relative to placebo. The authors concluded that the effects appeared to involve a mechanism distinct from NGF enhancement alone.[1]
A more recent double-blind, placebo-controlled pilot study published in Nutrients in 2023 examined both acute and chronic effects of lion’s mane supplementation in 41 healthy young adults aged 18 to 45. The study used 1.8 g of Hericium erinaceus daily over 28 days. While the primary outcomes focused on cognitive processing speed, researchers also assessed subjective stress levels. Following the 28-day supplementation period, a trend toward reduced subjective stress was observed in the treatment group (p = 0.051), though the authors noted the small sample size and urged caution in interpretation. The study called for replication in larger cohorts before firm conclusions can be drawn.[2]
The Role of Neurotrophin Pathways in Mood Disorders
To understand why lion’s mane is being studied in the context of anxiety, it helps to consider the broader neuroscience. The “neurotrophic hypothesis” of depression and anxiety posits that reduced levels of brain-derived neurotrophic factor (BDNF) and nerve growth factor are associated with mood dysregulation. Hericium erinaceus bioactive compounds have been shown in preclinical models to promote neurotrophic factor expression, which may support neuronal health in mood-relevant circuits.
A 2019 review published in the International Journal of Molecular Sciences analyzed the available preclinical and clinical literature and concluded that Hericium erinaceus represents a plausible candidate for further investigation as a complementary approach to mood disorders. The review specifically highlighted its antioxidant, anti-inflammatory, and neurotrophic properties as potentially relevant to the underlying pathophysiology of depression and anxiety. The authors were careful to note that antidepressant effects have not yet been validated in direct comparison with conventional medications.[3]
Limitations of Current Evidence
It is important to contextualize these findings appropriately. Several limitations apply to the existing research base:
- Sample sizes are small. Most human trials to date have enrolled fewer than 50 participants, which limits statistical power and generalizability.
- Study populations vary. The 2010 trial enrolled perimenopausal women specifically, which may not reflect outcomes in other demographic groups.
- Dosing protocols differ. Studies have used different forms of lion’s mane (cookies, capsules, extracts) at varying concentrations, making direct comparisons difficult.
- Anxiety is rarely the primary endpoint. In most existing trials, mood and anxiety outcomes are secondary or exploratory measures rather than primary endpoints, which affects the strength of conclusions that can be drawn.
- Long-term effects remain unknown. No studies have evaluated outcomes beyond a few months of supplementation.
These limitations do not invalidate the existing findings, but they do underscore the need for larger, well-designed clinical trials before lion’s mane can be confidently recommended for anxiety management.
How This Compares to Lion’s Mane Research in Other Domains
The anxiety and mood research on lion’s mane is at an earlier stage than research in other areas. For example, the literature on lion’s mane and nerve regeneration is more developed in preclinical models, with several studies demonstrating measurable effects on neurite outgrowth. For a deeper look at that body of work, see our overview of Lion’s Mane and Nerve Regeneration: What the Science Shows.
The mechanistic overlap between nerve regeneration and mood regulation is worth noting: both involve NGF signaling pathways. Researchers studying lion’s mane for neuropathy and cognitive decline may inadvertently be generating data that is also relevant to anxiety, which could accelerate the field’s understanding of mood-related applications.
What to Look for in a Lion’s Mane Supplement
If you are considering lion’s mane supplements in consultation with a healthcare provider, a few quality indicators are worth evaluating:
- Fruiting body vs. mycelium: Hericenones are concentrated in the fruiting body, while erinacines are found in the mycelium. Some researchers suggest that fruiting body extracts may be preferable for neurological applications, though evidence on this specific point is not definitive.
- Beta-glucan content: A certificate of analysis should confirm measurable beta-glucan levels, which serve as a proxy for bioactive compound concentration.
- Third-party testing: Reputable products are tested for heavy metals, mycotoxins, and microbial contamination by independent laboratories.
References
- [1] Nagano M, et al. Reduction of depression and anxiety by 4 weeks Hericium erinaceus intake. Biomed Res. 2010;31(4):231-7. PMID: 20834180
- [2] 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;15(22):4842. PMID: 38004235
- [3] Chong PS, et al. Therapeutic Potential of Hericium erinaceus for Depressive Disorder. Int J Mol Sci. 2019;21(1):163. PMID: 31881712
This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before starting any supplement.
