Lion's Mane
Hericium erinaceus
A nerve-growth mushroom with promising early data.
Evidence tier
Preliminary
Research weight
Citations
12 verified / 13
Classification
Nootropic
❝
What the evidence says. Early or small human trials; promising but not yet conclusive.
What is Lion's Mane?
Lion's Mane (Hericium erinaceus) is a nootropic used for cognitive support. NutriDex grades the human evidence as Preliminary. Lion's Mane contains compounds that stimulate nerve growth factor (NGF) in cell and animal studies. Human trials are small but intriguing: one showed improved cognition in older adults with mild impairment that faded after stopping, and another reported reduced anxiety/depression. Evidence remains preliminary, and extract quality varies widely between products.
Purported Benefits
✓Cognitive support
✓Nerve health
✓Mood
✓Possible neuroprotection
Evidence by outcome
The same supplement can be well-proven for one use and unproven for another — here is the human evidence graded outcome by outcome.
| Outcome | Evidence | Effect | Studies |
|---|---|---|---|
| Cognitive function (mild impairment/older adults)SR of 26 studies found ~1.2-point MMSE gain; original Mori RCT benefit faded after stopping. | Preliminary | ↑ benefit · small | 3 |
| Acute cognition in healthy adultsSome single-dose RCTs improved reaction time/working memory; others found no effect or worsened executive tasks. | Mixed | ↔ mixed · small | 3 |
| Depression/anxietySmall Nagano trial in menopausal women plus SR signals; underpowered and short. | Preliminary | ↑ benefit · small | 2 |
| Alzheimer's disease (erinacine A)Single 49-week RCT (n=41) improved MMSE/ADL; needs replication in larger samples. | Preliminary | ↑ benefit · moderate | 1 |
| Neuroprotection (NGF/BDNF)Mostly preclinical NGF/BDNF mechanism; one small RCT raised circulating BDNF, human data limited. | Preliminary | ↑ benefit | 1 |
Dosing & Compounds
Typical Dose
500–3,000 mg/day of fruiting-body extract.
Active Compounds
Safety & Cautions
Well tolerated in trials. Rare skin/respiratory allergy. Long-term data lacking. Educational only — always check with your doctor or pharmacist before combining Lion's Mane with any medicine.
Key Studies ★ 13 studies
Systematic review
Menon 2025 (Systematic review)
✓ PubMed
Systematic review of 26 studies (5 RCTs) found modest cognitive benefit (combined weighted MMSE increase of ~1.17 points, more pronounced in cognitively impaired adults) plus signals for reduced depression/anxiety, with H. erinaceus generally well tolerated.
Systematic review
Spangenberg 2025 (Systematic review)
✓ PubMed
Systematic review of 23 preclinical studies found erinacines (notably erinacine A) activate Nrf2 antioxidant and pro-survival pathways and improve cognitive/behavioral outcomes in cellular and rodent models in a dose-dependent manner.
RCT
Docherty 2023 (RCT)
✓ PubMed
Double-blind RCT in 41 healthy adults (18-45) found 1.8 g/day H. erinaceus produced faster Stroop reaction time 60 min after a single dose and a non-significant trend toward reduced stress after 28 days.
RCT
Surendran 2025 (RCT)
✓ PubMed
Acute crossover RCT in 18 healthy young adults found a single 3 g dose of standardised H. erinaceus extract did not improve composite cognition or mood, with only an isolated pegboard (psychomotor) improvement at 90 minutes.
RCT
Cernelic Bizjak 2024 (RCT)
✓ Full text
8-week double-blind RCT in 33 healthy adults found erinacine A-enriched H. erinaceus (3.44 mg erinacine A/day) significantly increased cognitive processing speed and circulating BDNF and raised gut microbiota diversity versus placebo, with good tolerability.
RCT
Frontiers in Nutrition 2025 (acute crossover study)
✓ Full text
Double-blind randomized placebo-controlled crossover study in 18 healthy young adults given a 3 g standardised 10:1 fruiting-body extract found no significant acute effect on composite cognition or mood at 90 min, with worsened performance on executive-function tasks (Flanker, Trail Making B).
RCT
La Monica 2023
✓ PubMed
Randomized, double-blind, placebo-controlled crossover trial; a single 1 g dose of Nordic Lion's Mane significantly improved working memory and complex attention (N-Back reaction time, Serial 7s attempts) and Go/No-go Go-stimulus reaction time at 2 h post-ingestion versus placebo, plus improved self-rated happiness.
RCT
Li 2020 (RCT)
✓ PubMed
49-week double-blind RCT in 41 patients with mild Alzheimer's disease found erinacine A-enriched H. erinaceus mycelia (3x350 mg/day) significantly improved MMSE and daily-living scores versus placebo.
Authoritative safety review
LiverTox 2024 (Safety review)
✓ Full text
NIH LiverTox monograph concludes lion's mane (H. erinaceus) supplements have not been linked to serum enzyme elevations or clinically apparent liver injury, with adverse effects largely limited to rare GI upset and skin reactions/allergy.
Clinical trial
Nagano 2010
✓ PubMed
Reduced depression and anxiety in menopausal women (small trial).
Clinical trial
Saitsu 2019
Verify ↗
Improved cognitive function in a small healthy-adult trial.
Review
Brandalise 2023 (Review)
✓ PubMed
Review concluded that despite strong preclinical NGF/BDNF-mediated neuroprotective evidence, human clinical data for H. erinaceus in neurodegenerative disease remain limited and underpowered, with an urgent need for larger trials.
Study
Mori 2009
✓ PubMed
Improved cognitive scores in older adults; effect reversed after cessation.