Lion's Mane Mushroom
Functional MushroomAlso known as: Lions mane · Hericium erinaceus · Yamabushitake
A medicinal mushroom that stimulates NGF (nerve growth factor) production. Studied for cognitive enhancement, neuroprotection, and mood. Evidence is largely in vitro and animal studies, with limited human RCTs.
How expert claims hold up
136 of 136 claims assessed34 of 136 assessed claims supported or partially supported by published research
Expert Consensus
Evidence Summary
Lion's mane mushroom (Hericium erinaceus) has attracted growing scientific interest for its potential effects on cognitive function, mood, and neurological health. The current human evidence base consists of a small number of randomized controlled trials (RCTs), several narrative reviews, and a limited number of systematic reviews. Taken together, the research suggests there may be modest cognitive benefits — particularly for memory and attention — but the evidence is preliminary and should be interpreted with caution. No human trials support its use as a treatment for any diagnosed medical or psychiatric condition.
Read full evidence summary →Top studies
Edible and Medicinal Fungi as Candidate Natural Antidepressants: Mechanisms and Nutritional Implications.
Edible and Medicinal Fungi as Candidate Natural Antidepressants: Mechanisms and Nutritional Implications.
Effect of nutritional supports on malnutrition, cognition, function and biomarkers of Alzheimer's disease: a systematic review.
Effect of nutritional supports on malnutrition, cognition, function and biomarkers of Alzheimer's disease: a systematic review.
Expert Mentions
All 136 mentions
“The challenge is that most human trials are small, short, and from a limited number of research groups. We need larger, more rigorous trials before making strong recommendations.”
Most human trials of lion's mane are small, short, and from a limited number of research groups, so larger and more rigorous trials are needed before making strong recommendations.
The available evidence directly supports Huberman's caution. The human RCTs identified (PMIDs 18844328, 31413233, 38004235, 38140277) are small pilot or single-center studies, with the oldest landmark…
“the research base is thin relative to the enthusiasm around this supplement. Most human trials are small, short, and from a limited set of research groups.”
The research base for lion's mane is thin relative to the enthusiasm around the supplement; most human trials are small, short, and from a limited set of research groups.
No relevant PubMed studies were retrieved to assess this claim.
Safety, interactions & who should avoid Lion's Mane Mushroom
generally_recognized_safe
Lion's mane appears to be generally well-tolerated in short-term human trials, with no serious adverse events prominently reported in the studies reviewed. However, long-term safety data in humans is lacking, and the optimal safe dose has not been established.
Lion's mane appears to have a favorable short-term safety profile in the reviewed trials, with few serious adverse events reported. Individuals with mushroom allergies should exercise caution, and long-term safety data in humans remains limited.
Who should avoid it
Individuals with known mushroom or mold allergies should avoid lion's mane. Those who are pregnant, breastfeeding, or taking immunosuppressant medications should consult a healthcare provider before use, as clinical safety data in these populations is lacking.
Known interactions
- ·Potential additive effect with anticoagulant or antiplatelet medications — some preclinical data suggests possible effects on platelet aggregation
- ·May theoretically interact with immunomodulatory drugs given its immune-modulating properties observed in preclinical and oncology-adjacent research
Pregnancy & breastfeeding
Our sources specifically flag pregnancy or breastfeeding considerations for Lion's Mane Mushroom — see the cautions above.
We don’t assign pregnancy-safety ratings. Many supplements lack adequate safety data in pregnancy and breastfeeding, and the absence of a warning here does not mean a supplement is safe to take. Don’t start, stop, or continue any supplement while pregnant or nursing without your OB-GYN or midwife.
Read: Supplements during pregnancy & breastfeeding →This is educational information only. Consult a healthcare provider before starting any supplement.
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Key findings
- ·A double-blind RCT in young adults found some improvements in cognitive performance (including short-term memory and attention) following 28 days of lion's mane supplementation at 1.8g, though the study was small and described as a pilot.
- ·An earlier double-blind, placebo-controlled RCT found improvements on a cognitive function scale in older adults (ages 50–80) with mild cognitive impairment, suggesting a possible benefit in at-risk populations.
- ·Systematic and narrative reviews identify biologically plausible mechanisms — including nerve growth factor (NGF) stimulation — that could support cognitive and mood effects, but most mechanistic evidence comes from preclinical (animal or cell-based) studies.
Evidence gaps
- ·All human RCTs to date are small, short-term, and largely from a limited number of research groups — larger, independent, and longer-duration trials are needed to confirm any benefits and establish optimal dosing.
- ·It is unknown whether benefits observed in older adults with mild cognitive impairment translate to healthy young adults, or vice versa, as different populations have been studied in different trials without direct comparison.
- ·The long-term safety profile, potential drug interactions, and effects of chronic use remain poorly characterized in human research.