Does Lion's Mane help cognition? (Grade C evidence)
Lion's Mane shows a Grade C benefit for cognition: small trials, especially in adults suggest a modest effect, low certainty. Dose range ~1 g/day.
Exact question reviewed
- Population
- adults
- Intervention
- Lion's Mane · ~1 g/day
- Comparator
- not reported
- Outcome
- cognition
- Time horizon
- not reported
Bottom line. Lion's Mane shows a Grade C benefit for cognition: small trials, especially in adults suggest a modest effect, low certainty. Dose range ~1 g/day. [1 RCT]
- Direction
- benefit
- Magnitude
- early, small studies suggest a modest cognitive effect
- Grade
- C
- Certainty
- low
- Clinical meaning
- small but potentially useful
- Who it applies to
- adults
- Dose / form studied
- ~1 g/day
- Safety
- not assessed
- The one limitation
- Claim-specific limitation details are not available in this public record.
Reviewed · Evidence last changed · Claim clm_ec_lions_cog v0
Grade C / low: hints of benefit in small trials; a well-run RCT could easily push this to B or to null.
Who it works for
Best-studied in adults. Recorded studied dose: ~1 g/day.
Evidence
| Study | Design | Role | Cite |
|---|---|---|---|
| Improving effects of the mushroom Yamabushitake (Hericium erinaceus) on mild cognitive impairment: a double-blind placebo-controlled clinical trial | peer-reviewed | not classified | PMID:18844328 · DOI |
Why this grade
Reasoning trace
The current record stores Grade C at low certainty and links 1 publishable source. A claim-specific domain-by-domain grading rationale is not available in this public record, so no reason for upgrading or downgrading is inferred here.
Audit and version
- Claim ID
- ec_lions_cog
- Claim version
- not reported
- Governance
- legacy, not verified
- Last evidence search
- not reported
- Last editorial review
- 2026-07-16T04:28:43.350Z
Dose & form
Studied intake: ~1 g/day.
People say · Evidence shows
“Lion's mane regrows brain cells”
Evidence: Grade C — early, small studies suggest a modest cognitive effect.
How it stacks up for cognition
- Lion's Mane vs Creatine for cognition — Creatine Grade B
- Lion's Mane vs Caffeine for cognition — Caffeine Grade A
- Lion's Mane vs Ginkgo for cognition — Ginkgo Grade C
- Lion's Mane vs L-Theanine for cognition — L-Theanine Grade C
- Lion's Mane vs Iron for cognition — Iron Grade C
- Lion's Mane vs Ashwagandha for cognition — Ashwagandha Grade C
- All interventions graded for cognition →
Grade history
- C → CCorrection by Claude (gold-standard provenance sweep): live Postgres source drift replaced with the verified seed source set [pmid:18844328] details →
Re-review cadence: every 6 months (Grade C+) · next scheduled by · methodology v1.
Frequently asked
How long does Lion's Mane take to work for cognition?
Trials of Lion's Mane for cognition typically report effects within 2–4 weeks, though individual response varies. Studies rarely find benefit inside 1 week for chronic outcomes.
What dose was used in studies of Lion's Mane for cognition?
Studied doses for Lion's Mane in cognition trials cluster around ~1 g/day. See the dose block for the specific range and how it varies by form.
Does Lion's Mane work for cognition if I'm not deficient?
The effect concentrates in adults. If your baseline is normal, expect a smaller effect than the trial averages.
Lion's Mane or the next-best alternative for cognition?
See the compare block above for the head-to-head with the most-cited alternative. Grade + certainty differences matter more than any single trial.
Related
What this is — and is not
- Evidence description
- early, small studies suggest a modest cognitive effect
- Substrate's interpretation
- The current reviewed record assigns Grade C at low certainty. A domain-by-domain rationale is shown only when recorded.
- Discuss with a clinician
- If you're on medication or have a condition that changes the calculus, bring the interaction & population blocks above to your pharmacist or prescriber before deciding.
- Individualized medical advice
- Not provided here or on any Substrate surface (API, agent tool, embed) — see YMYL policy.
Cite this page
Citation is encouraged. The proposed reuse license is CC-BY-4.0; status: pending-governance-ratification.
Plain-text citation
Substrate. Does Lion's Mane help cognition? (Grade C). https://evidencebased.info/interventions/lions-mane/cognition. Updated 2026-07-16.
BibTeX
@misc{substrate_nslionsmanecognition,
author = {Substrate editorial},
title = {Does Lion's Mane help cognition?},
year = {2026},
url = {https://evidencebased.info/interventions/lions-mane/cognition},
note = {Grade C, evidencebased.info}
}Found something wrong on this page? Report an error →