Stress and anxiety are among the most common complaints in modern life, and interest in natural, evidence-informed approaches continues to grow. Several functional mushroom species have attracted scientific attention for their potential to support the nervous system, modulate the body’s stress response, and ease symptoms associated with low mood and anxiety. This article reviews what the current research actually shows, mushroom by mushroom, without overstating the evidence.
How Functional Mushrooms May Interact With Stress Pathways
The body’s primary stress-response system is the hypothalamic-pituitary-adrenal (HPA) axis, which regulates cortisol and other stress hormones. Chronic activation of this pathway is associated with persistent anxiety, disrupted sleep, and mood disturbance. Several bioactive compounds found in functional mushrooms, including polysaccharides, triterpenes, and neuroactive small molecules, have been studied in the context of HPA regulation, neurotransmitter modulation, and neuroinflammation.
A 2025 systematic review published in Molecular Nutrition and Food Research examined the antidepressant potential of edible and medicinal fungi. The review found that extracts from species such as Ganoderma lucidum, Hericium erinaceus, Poria cocos, and Cordyceps militaris demonstrated antidepressant-like effects in preclinical studies, with mechanisms including modulation of the serotonin and dopamine systems, regulation of the HPA axis, reduction of neuroinflammation, and positive effects on the gut-brain axis via microbiome modulation.[1] The authors noted, however, that clinical validation in humans remains limited and that standardization of extracts presents an ongoing challenge.
Lion’s Mane (Hericium erinaceus) and Anxiety
Hericium erinaceus, commonly known as Lion’s Mane, is perhaps the most studied functional mushroom in the context of mood and cognition. Its fruiting body contains hericenones and erinacines, compounds that may stimulate nerve growth factor (NGF) synthesis. NGF plays a role in the survival and function of neurons involved in emotional regulation.
A randomized, placebo-controlled trial published in Biomedical Research investigated the effects of four weeks of Hericium erinaceus intake in a group of 30 women. Participants who consumed H. erinaceus cookies showed significantly lower scores on the Center for Epidemiologic Studies Depression Scale (CES-D) and the Indefinite Complaints Index (ICI) compared to baseline, with the HE group also showing trends toward lower scores for “concentration,” “irritating,” and “anxious” symptoms compared to the placebo group. The researchers concluded that this intake period may have the potential to reduce depression and anxiety through a mechanism distinct from the known NGF-enhancing action of the mushroom.[2]
For readers interested in a deeper look at this mushroom’s neurological research, see our overview of Lion’s Mane and depression.
Reishi (Ganoderma lucidum) and the Stress Response
Ganoderma lucidum, known as Reishi or Lingzhi, has a long history of use in traditional East Asian medicine as a calming tonic. Its key bioactive constituents include polysaccharides and triterpenes, both of which have been studied for immune and nervous system effects.
Preclinical studies have suggested that G. lucidum polysaccharides may modulate the HPA axis and reduce markers of oxidative stress associated with chronic psychological stress. The 2025 systematic review referenced above specifically included Ganoderma lucidum among species demonstrating antidepressant-like effects in animal models, with proposed mechanisms involving the tryptophan-kynurenine pathway, which intersects with serotonin metabolism and immune-driven mood dysregulation.[1] Human clinical data for Reishi as a stand-alone anxiolytic remain limited at this time.
Cordyceps (Cordyceps militaris) and Stress-Related Mood
Cordyceps militaris is primarily recognized for its potential effects on energy and endurance, but research has also explored its relevance to stress-related mood disturbance. A 2021 study published in the Journal of Ethnopharmacology investigated the antidepressant-like effects of a water extract of C. militaris in an animal model of unpredictable chronic mild stress. The extract was found to modulate the ROCK2/PTEN/Akt signaling pathway, which is implicated in neuronal survival and stress resilience, and produced significant antidepressant-like effects in the model.[3] This research was conducted in animals, and direct translation to human outcomes requires further study.
Poria Cocos and Neurological Calm
Poria cocos, a woody fungus used extensively in Traditional Chinese Medicine, is another species included in the emerging research on fungi and mood. Its polysaccharide content has been identified as a key bioactive fraction with potential anti-neuroinflammatory effects. The 2025 systematic review cited it among fungi whose extracts demonstrate antidepressant-relevant activity in preclinical settings, potentially through gut-brain axis modulation and reduction of pro-inflammatory cytokines that are associated with anxiety and depression.[1]
What the Evidence Does and Does Not Support
It is important to be precise about the current state of this research. The majority of studies on functional mushrooms and stress or anxiety have been conducted in animal models or in vitro. The human trial data are limited in sample size and scope. Lion’s Mane has the most direct human clinical evidence relating to anxiety and mood, though even here the available trials are small and short-term.
Research suggests that several mechanisms are plausible: HPA axis modulation, neurotransmitter system effects, reduction of neuroinflammation, and indirect benefit via microbiome-gut-brain pathways. These pathways are well-established in stress biology; what remains to be confirmed in rigorous human trials is the degree to which functional mushroom extracts can meaningfully engage them at realistic supplemental doses.
Practical Considerations
If you are considering functional mushroom supplements for stress or anxiety support, a few points are worth noting. Extract quality, standardization of beta-glucan content, and whether a product uses the fruiting body or mycelium can all affect efficacy. Anyone managing clinical anxiety or depression should consult a qualified healthcare provider before adding supplements to their routine, as evidence-based treatments remain the standard of care for these conditions.
Summary
Research suggests that several functional mushroom species, particularly Hericium erinaceus, Ganoderma lucidum, Cordyceps militaris, and Poria cocos, may interact with pathways relevant to stress and anxiety. The most direct human clinical evidence to date involves Lion’s Mane, where a small randomized trial observed reductions in anxiety and depression scores over four weeks. Broader clinical confirmation is still needed across all species. Functional mushrooms represent an area of active and legitimate scientific inquiry, and the evidence base is expected to expand in the coming years.
References
- 1. Gong P, et al. Edible and Medicinal Fungi as Candidate Natural Antidepressants: Mechanisms and Nutritional Implications. Mol Nutr Food Res. 2025;69(12):e70080. PMID: 40289452
- 2. Nagano M, et al. Reduction of depression and anxiety by 4 weeks Hericium erinaceus intake. Biomed Res. 2010;31(4):231-7. PMID: 20834180
- 3. Lin YE, et al. Antidepressant-like effects of water extract of Cordyceps militaris by modulation of ROCK2/PTEN/Akt signaling in an unpredictable chronic mild stress-induced animal model. J Ethnopharmacol. 2021;276:114194. PMID: 33974945
Disclaimer: This article is for informational purposes only and does not constitute medical advice. Functional mushroom supplements are not intended to diagnose, treat, cure, or prevent any disease or mental health condition. Consult a qualified healthcare provider before starting any new supplement, especially if you are managing anxiety, depression, or any other medical condition or taking medications.
