Evidence overview
Lion's Mane
Lion's Mane (Hericium erinaceus) is a medicinal mushroom most often studied for cognitive function, mood, and peripheral nerve effects. The human research base is comparatively young: a handful of small randomized trials, several open-label studies, and rapidly expanding preclinical and animal work. Authoritative consensus documents have not yet been published.
Most studied for
Coverage pending
PubMed coverage
Coverage pending
Safety profile
In your full report
Mechanism class
Edible and medicinal mushroom containing hericenones and erinacines, compounds shown in preclinical work to...
Study coverage
Study coverage by goal
PubMed counts for Lion's Mane grouped by the goal each study targets.
Evidence overview is temporarily unavailable for Lion's Mane.
Evidence
What the evidence covers
What's been studied. Conclusions live in the full report.
Lion's Mane preparations vary substantially in the studied literature: hot-water extracts, dual-extracts (water + alcohol), dried fruiting body powder, and mycelium-grown-on-grain products all appear, and they likely differ in compound concentration. Trials rarely standardize to a specific hericenone or erinacine content, which makes cross-trial comparison difficult and is a known limitation of the existing evidence base.
The outcome dimensions covered most heavily in human trials are cognitive function (in mild cognitive impairment and healthy adults), subjective mood and sleep quality, and peripheral nerve regeneration markers. Smaller research streams address gastrointestinal effects and immune-related outcomes. Most trials are short (8-16 weeks) and small (under 100 participants), which limits how confident the field can be about durable effects.
Demographically, Japanese populations are over-represented in the cognitive literature (Lion's Mane has a longer history of clinical study in Japan), and most trials enroll older adults with mild cognitive concerns rather than healthy young adults. The growing wave of preclinical mechanistic work has yet to be matched by large-scale human trials, which is the principal gap a future evidence-base maturation would close.
Safety
Safety summary
Common adverse events, drug interactions, and special populations.
Lion's Mane is generally well-tolerated in human trials at typical supplemental doses. The most-reported adverse events are mild gastrointestinal discomfort and occasional allergic skin reactions (a small case-series literature documents contact dermatitis in mushroom-allergic individuals). No established tolerable upper limit exists. Drug interactions are not well-characterized in clinical trials; theoretical interactions with anticoagulants have been raised based on preclinical observations but are not supported by clinical data. People with known mushroom allergies should avoid; those on prescription medications should consult a clinician before starting.
This summary is informational and not medical advice. Consult a clinician before starting or changing any supplement, especially if you take prescription medications.
Limitations
What this page doesn't answer
Where the public summary stops and the full report begins.
This page summarizes the Lion's Mane literature at a general level. It does not address which preparation (extract type, dosing form, or standardization) is right for your goal, what dose has been shown to be effective in trials relevant to your goal (on Starter, matched to your age and sex), or how Lion's Mane interacts with the medications and supplements you take. The personalized report works through these questions. Crucially, the field's research base is still maturing for Lion's Mane - consensus documents and large-scale trials have not yet been published, so the evidence ceiling here is genuinely lower than for supplements like magnesium or omega-3.
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Goal-specific evidence
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