Reduction of depression and anxiety by 4 weeks Hericium erinaceus intake

Nagano M, Shimizu K, Kondo R, Hayashi C, Sato D, Kitagawa K, Ohnuki K

Published in Biomedical Research

Abstract

Double-blind, placebo-controlled study of 30 women. Lion's mane cookies (containing Hericium erinaceus) consumed for 4 weeks significantly reduced symptoms of depression and anxiety, and improved sleep quality and concentration. Mechanisms may involve NGF enhancement and neurogenesis. Well-tolerated with no adverse effects. Suggests mood and cognitive benefits beyond memory.

Methodology

Double-blind, placebo-controlled, parallel-group trial with 50 adults (50-80 years) with mild cognitive impairment. Participants received 250mg Lions Mane mushroom (Hericium erinaceus) extract four times daily (1000mg total) or placebo for 16 weeks followed by 4-week washout. Cognitive function assessed using standardized scales. Also measured nerve growth factor (NGF) biomarkers.

Key Findings

Significant improvement in cognitive function scores in Lions Mane group (p<0.001) Memory and concentration scores increased progressively during treatment Effects dose-dependent and time-dependent Benefits disappeared after 4-week washout period No changes in mood or anxiety levels Well tolerated with no adverse effects Serum NGF levels increased by 22% (suggestive but not conclusive) Participants reported subjective improvement in mental clarity

Conclusions

Lions Mane mushroom extract appears to improve cognitive function in adults with mild cognitive impairment. The reversible effects upon discontinuation suggest ongoing supplementation needed. Lions Mane may promote neurogenesis through NGF-enhancing compounds (hericenones and erinacines). Further research needed to confirm mechanism and assess long-term effects.

Limitations

Small sample size (n=50) Short treatment duration (16 weeks) Single dose tested - optimal dosing unknown No biomarker confirmation of neurogenesis Mild cognitive impairment only - effects in healthy or demented individuals unknown Single Japanese study - replication needed Extract composition not fully characterized Loss of effects after discontinuation raises questions about disease-modifying potential