Lion's mane benefits: what the research does and doesn't show

The research does not support lion's mane as a treatment for memory loss, dementia, depression, anxiety or nerve damage in anyone. In healthy adults, the best-controlled trials we found were small, used doses and forms that differ from a typical capsule, and two of three showed no overall effect. Here is what each trial actually measured.

What the evidence doesn't support

• It doesn't show lion's mane improves memory, focus or mood in healthy adults. Of four placebo-controlled healthy-adult trials with a stated dose, none showed a clear overall gain: two found no significant effect on their main measures, one was a pilot whose authors called its results tentative, and one found gains on a few quick tasks after a single dose.
• It doesn't establish an effective dose. The trials used 1 g, 1.8 g, 3 g and 10 g, in different forms, and the 10 g trial found nothing, so "more works better" is not supported either.
• It doesn't show lion's mane treats or prevents any disease. The few trials in people with diagnosed conditions were small, used different materials, and some had authors tied to mushroom or supplement companies.
• It doesn't show that nerve growth seen in lab and animal studies happens in people who take capsules. We found no human trial measuring that.
• It doesn't tell you what the capsule on your shelf does. No trial we found tested a fruiting-body-and-mycelium powder at 1,000 mg a day.

What the trials found

Healthy adults

A 2023 double-blind, placebo-controlled pilot in 41 healthy adults aged 18-45 gave 1.8 g a day of lion's mane (the part of the mushroom and processing were not stated in the abstract). A single dose was followed by quicker performance on one reaction-time task (the Stroop task) at 60 minutes (p = 0.005). After 28 days of daily use, a trend toward lower self-rated stress did not reach significance (p = 0.051). The authors reported null and limited negative findings elsewhere and said the results should be read with caution (PMID 38004235). Certainty: low.

A 2025 double-blind crossover trial in 18 healthy adults aged 18-35 gave a single 3 g dose of a 10:1 fruiting-body extract and tested at 90 minutes. It found no significant effect on the composite measures of thinking or mood; one individual test (a pegboard task) improved. Two authors work for companies that use lion's mane (PMID 40276537). Certainty: low. Single dose, a concentrate, 18 people.

A 2023 double-blind crossover trial gave a single 1 g dose of a Nordic-grown lion's mane extract to healthy participants (the abstract does not state how many). It was followed by better scores on a few quick tasks within 2 hours (Serial 7s attempts, N-back and Go reaction times) and two happiness ratings, while the placebo also improved focus and concentration (PMID 38140277). Certainty: low.

A pilot in 13 healthy adults with no placebo group took lion's mane powder for 7 days; gut bacteria diversity rose and changes correlated with some blood measures. The abstract gives no dose, and it says nothing about how anyone felt (PMID 33800983). Certainty: very low.

A 2022 single-blind trial in 24 college-age adults gave 10 g a day of lion's mane baked into muffins for 4 weeks. It found no significant difference on measures of metabolic flexibility or thinking (all p > 0.05), though the groups already differed at the start (PMID 36582308). Certainty: low. It is the highest dose we found, and it was null.

Older adults and diagnosed conditions

These are disease populations; they cannot be read as what a capsule does for a healthy person.

A 2009 double-blind trial in 30 Japanese adults aged 50-80 diagnosed with mild cognitive impairment (15 per group) used four 250 mg tablets, each containing 96% lion's mane dry powder, three times a day, about 3 g a day, for 16 weeks. Scores on one cognitive scale were higher than placebo at weeks 8, 12 and 16, and fell again 4 weeks after stopping (PMID 18844328). One site, 30 people, and the first author is from a mushroom company's laboratory. Certainty: low.

A 12-week double-blind trial of a supplement containing lion's mane fruiting body found one of three cognitive tests improved against placebo (the Mini Mental State Examination); the abstract does not give the dose or participants and the other two tests did not differ (PMID 31413233). Certainty: very low; we could not check the dose.

A 49-week pilot gave patients with mild Alzheimer's disease three 350 mg capsules a day, about 1,050 mg, of an erinacine A-enriched mycelium (5 mg/g erinacine A). Some test scores were better than placebo; four people left for abdominal discomfort, nausea or skin rash. The authors are from the supplier (PMID 32581767). Certainty: low. The milligrams look like a standard 1,000 mg capsule, but the material is a different, standardized mycelium in a different population, so it does not transfer.

Mood and sleep questionnaires

An 8-week study in 77 overweight or obese adults recruited because they had mood, sleep or binge-eating complaints, all on a low-calorie diet, found that self-rated scores on mood, anxiety and sleep questionnaires changed over the 8 weeks; the abstract gives no dose and does not describe a placebo group (PMID 31118969). A 4-week trial in 30 women using lion's mane cookies found that a depression-scale score was down compared with before intake, but only two sub-items differed from placebo (PMID 20834180). Neither gives a dose. Certainty: very low; diet changes and small groups make these hard to read.

The overall picture

A 2025 systematic review of the human and lab literature reported small cognitive score changes in the few trials in people with and without dementia, and listed stomach discomfort, headache and allergic reactions as possible side effects, noting they are commonly unreported (PMID 40959699). It pools trials of very different materials, so its summary is not a verdict on any one product.

Questions people ask

What's lion's mane good for, and what is it used for?

It is used as a food and as a traditional mushroom. As a supplement, people take it hoping for sharper thinking or better mood. The trials above did not establish that for healthy adults at capsule doses.

Is lion's mane good for you, and are lion's mane mushrooms good for you?

The fresh mushroom is an ordinary edible mushroom. Whether a supplement benefits you has not been shown in healthy adults at typical capsule doses. Safety is covered in lion's mane side effects.

Who is lion's mane good for?

The trials do not identify a group that benefits. The clearest positive findings were in people with diagnosed conditions, using different materials, and they are not a basis for self-treatment. Who should avoid it is covered in who should not take lion's mane.

What do lion's mane supplements, extracts, capsules, pills, tea and tinctures do?

The trials used powder, extract, tablets, cookies and muffins. No trial we found tested tea or a tincture. The form changes how much mushroom you get; see what is lion's mane for forms.

Do lion's mane and ashwagandha work together?

No trial we found tested lion's mane combined with ashwagandha or another supplement. See ashwagandha and lion's mane.

What are lion's mane uses and side effects, and does it work for dogs?

Side effects are in their own guide. We do not cover animals; ask a vet.

When to talk to a doctor

Lion's mane is not a treatment for memory problems, dementia, depression, anxiety or any other condition, and nothing above supports using it in place of medical care. If you or someone you know has memory loss, low mood or anxiety, see a doctor. If you take prescription medication or have a mushroom allergy, ask first; see lion's mane and medications.