Pepdexpepdex
Stack
← All supplements

Lion's mane

Hericium erinaceus · Brain

LimitedLittle human data, early, small, or narrow.

Mushroom extract promoted for nerve growth factor and memory.

n=29 analyzed
The most-cited cognition trial, producer-affiliated authors, author-modified scale

What it is

A shaggy white mushroom used in East Asian cooking and traditional medicine, now the flagship of the nootropic-mushroom boom. It has a genuinely interesting nerve-growth mechanism and a human evidence base far smaller than its reputation.

How it works

Lion's mane contains hericenones and erinacines that stimulate nerve growth factor (NGF) production in laboratory systems, a real and unusual mechanism. The gap: most of that work is in cells and rodents, and the compounds concentrate differently in the fruiting body versus the mycelium, which is why product sourcing genuinely matters here.

Which form to buy

Fruiting bodyThe pivotal trial material

The pivotal cognition trial used ~2.9 g/day of plain DRIED FRUITING-BODY POWDER, not an extract. Contains hericenones.

What the best-known trial actually used.

Standardized / erinacine-enriched myceliumA separate trial thread

Distinct from myceliated grain: other human trials used standardized erinacine-enriched mycelium, so mycelium is not automatically inferior.

Has its own human trial base.

Myceliated grainCheap volume

Grown on rice or oats and sold with the substrate included, a large share of the powder can be residual starch.

The form where you may be buying mostly grain.

Dual extract (water + alcohol)Broader compound capture

Different actives dissolve in different solvents, though this is not a validated marker of clinical quality on its own.

Common marketing signal, unvalidated.

Culinary mushroomFood

Genuinely tasty and a legitimate route, an ordinary serving can exceed 3 g dry-weight equivalent, comparable to the trial amount.

A real option, not just a novelty.

What it actually does, graded

Mild cognitive impairment in older adultsLimited

The most-cited study randomized 30 people (29 analyzed), used an author-modified cognitive scale, had four authors affiliated with the mushroom producer, and its benefit faded after stopping.

Nerve growth factor stimulationLimited

Well demonstrated in cells and animals; not established in humans.

Mood and anxietyLimited

A few very small trials suggest modest improvements.

Nerve regeneration after injuryNone shown

Animal work is genuinely interesting; no human evidence.

General cognitive enhancement in healthy young adultsLimited

One small acute study; nothing established.

Pros and cons

Pros
  • A distinctive, plausible mechanism unlike anything else on the shelf
  • Excellent safety record as a food and supplement
  • Genuinely edible, you can just cook it
Cons
  • Human evidence is small, short and heterogeneous, several groups have now run small trials with mixed findings
  • Product quality varies enormously; grain-filler products are widespread
  • The nootropic reputation far outruns the trials

What to expect

  • The cognitive trial ran 16 weeks, and its benefit faded after participants stopped.
  • Nothing acute, this is not a stimulant.

Interactions

MonitorAnticoagulantsSome mushrooms show mild antiplatelet activity in lab work; human relevance is unclear.
MonitorDiabetes medicationSome animal studies show glucose lowering.
AvoidMushroom allergyRespiratory and skin reactions have been reported.

Is it for you?

Probably worth it if
  • Curiosity about a genuinely novel mechanism, with expectations set to the small evidence base
  • You would enjoy it as food anyway
Probably skip it if
  • You expect a reliable nootropic effect, the human evidence cannot support that claim

Who should avoid it

  • Anyone with mushroom allergies

Research on this supplement

Papers about this supplement, not proof of the claims above. A title says what was studied, which is sometimes a negative result or a different question entirely.

  • Benefits, side effects, and uses of Hericium erinaceus as a supplement: a systematic review
    Front Nutr, 2025
  • The Acute and Chronic Effects of Lion's Mane Mushroom Supplementation on Cognitive Function, Stress and Mood in Young Adults: A Double-Blind, Parallel Groups, Pilot Study
    Nutrients, 2023
  • Improving effects of the mushroom Yamabushitake (Hericium erinaceus) on mild cognitive impairment: a double-blind placebo-controlled clinical trial
    Phytother Res, 2009

What the evidence says

A handful of small human trials, mostly in older adults with mild impairment. Extrapolating those to healthy young brains is not supported.

What studies used

500-3,000 mg extract daily. Daily.

Reported from published studies and product labelling — a record of what was used in research, not a recommendation. What is right for you is a conversation with a clinician.

Evidence base

B574 research papers
established literature

Real human evidence: randomised trial reports, or review-level evidence backed by at least one human trial report.

This letter measures how much human research exists, not whether it works for you — the tier above (Limited) is the read on quality.

Research (12)

Turn Lion's mane into a plan that's yours

The info above is free. Membership makes it personal, the Coach answers questions about your exact stack, the Stack tracks it for you, and the Verified Sources shows you how to vet what you buy.

  • ✓ AI Coach, ask anything about your stack. It does the dosing math, flags interactions, and tells you what to do next.
  • ✓ Personal Stack, save your protocol, track it across devices, log doses, get a heads-up before a vial runs out.
  • ✓ Verified Sources, the vetted reference for checking quality and sourcing, members only.
Become a member, from $4.99/week

Cancel anytime · or save with $59.99/yr · Coach + Stack included

Where next

Every supplement in the catalogThe full shelf, grouped and evidence-tiered.→The compound indexSteroids, nootropics and research chemicals.→The peptide indexInjectable peptides and what trials used.→