supplist/supplements/Lion's Mane

Lion's Mane

Hericium erinaceus

Research reviewed, but no outcome currently meets the evidence threshold. The studies exist, but the current human evidence is still too limited, mixed, or narrow for a confident benefit claim.

What the research says

The research has been reviewed for each health effect below. Right now, none of these uses clears the evidence bar for a confident benefit claim.

— · Not enough human evidence yet
—
Cognition / memory / executive function
Only 2 papers in healthy adults. Small RCTs report acute cognitive improvements (faster reaction time on Serial 7s and N-Back). Need many more trials before this can be graded.
2 papers
—
MCI / dementia / Alzheimer's
Only 1 paper — a 2019 trial showing cognitive-test improvement in adults with mild cognitive impairment over 12 weeks. Promising but isolated.
1 paper
—
Mood, depression, anxiety
3 papers, mostly positive direction (1 positive, 2 mixed). Mostly small (n=30–41) short-duration (4 weeks) papers in healthy adults or perimenopausal women.
3 papers
—
NGF / nerve regeneration / neuroprotection
The headline marketing claim. No qualifying human RCT support. Mechanistic data exists in rodent and cell-culture papers; the leap to "lion's mane protects your brain" is not backed by human trials.
0 papers
—
Sleep quality
No qualifying human trials specifically on sleep.
0 papers
—
Fatigue / energy / quality of life
No qualifying human trials.
0 papers
—
Immune function / inflammation
No qualifying human trials.
0 papers
—
Gastric / GI health
Traditional-use claim with no qualifying modern human trials.
0 papers

Quick facts

What can be said from the few human trials that exist.

Typical dose
500–3,000 mg/day of fruiting body extract
Best taken
With meals. Timing not well-studied
Form
Fruiting body extract preferred over mycelium-on-grain products. Active compounds (hericenones, erinacines) concentrate in the fruiting body
Common side effects
Mild stomach discomfort. Itchy skin and respiratory reactions reported rarely (mushroom allergy)
Drug interactions
Limited data. Theoretical effects on blood clotting
The NGF mechanism
Lion's mane increases nerve growth factor in animal papers. Whether this translates to human cognitive benefits remains unproven

Quality-verified products

Products that pass third-party quality testing.

Products are not recommended when the underlying evidence base is this thin
Even when third-party testing confirms a lion's mane product is pure and accurately dosed, the underlying human evidence — 4 small papers for the entire supplement — does not support most of the claims made about it. Lion's mane products are not recommended at this time. If meta-analyses appear and the human evidence base grows, this section will update.

How we graded Lion's Mane

Grades come from 4 unique research papers indexed from PubMed — including 1 meta-analysis, 1 systematic review, and 2 randomized trials. Almost no human research exists. Every health effect falls below the threshold to grade. The "—" grades reflect the evidence base, not a negative finding. Each supplement is graded by health effect using a certainty × effect matrix applied across PubMed evidence per health effect. Cochrane reviews and high-quality systematic reviews carry the most weight. From abstract-only data, "high certainty" is rare — most A grades come from moderate certainty plus consistent meaningful-positive evidence. See Methodology for full detail.

Read the full methodology → · Download all 4 citations (PDF)