Lion’s ManeMushroom UK
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    Independent guide for the UK

    Lion’s mane, without the hype

    A shaggy white mushroom that grows on old beech and oak, now sold as capsules, powders and coffee that promise a sharper brain. We read every human trial, say how strong the evidence really is and explain how to take it safely.

    See all 10 human trialsHow much to take
    A wild lion’s mane mushroom hanging from the underside of a fallen log, its long cream spines falling like a fringe
    Wild lion’s mane on a fallen log, Hampshire. Photo: Simon Colenutt, CC BY 4.0
    10
    published human trials of lion’s mane on its own
    338
    people took part in all of them combined
    77
    people in the largest trial, which had no placebo group
    0
    products sold, ads or paid links on this site

    What the research supports

    Each common claim, graded by the quality of the human evidence behind it. Most of the excitement comes from cell and animal studies; the human trials are small, short and often funded by the people selling the product.

    1. Memory in older adults with mild decline

      Three small placebo-controlled trials (30 to 41 people each) found better scores on short memory tests.

      Moderate

    2. Focus and thinking in healthy adults

      Five small trials. Two found a quicker response on one or two tasks after a single dose; three found nothing.

      Weak

    3. Anxiety and low mood

      Two small studies found lower scores, but one had no placebo group and the other mostly compared people with themselves.

      Weak

    4. Sleep

      Better sleep scores in one study without a placebo group; a placebo-controlled study found no change.

      Weak

    5. Stomach and gut health

      Lab and animal work, plus studies of mixed supplements that also contained other ingredients.

      Weak

    6. Nerve repair and neuropathy

      Promising in rats and cell cultures; no trial in people.

      None

    7. Immunity

      Lab and animal studies of its beta-glucans only.

      None

    8. Cancer

      Cell and animal studies only. Never use it in place of cancer treatment.

      None

    9. Blood sugar and diabetes

      Animal studies only.

      None

    • No human evidence
    • Weak evidence
    • Moderate evidence
    • Strong evidence

    Read the full benefits guide

    Every human trial, in one table

    10 trials, 338 people. Memory studies in older adults look the most promising; studies in healthy young adults mostly found nothing. See the full details and caveats.

    StudyWho took partDoseLengthResult
    Evans 2026USA, focus and thinking10 healthy adults aged 18 to 552 g a dayMycelium and fruiting body powder28 daysNo benefit found
    Surendran 2025UK, focus and thinking18 healthy adults aged 18 to 353 g, single dose10:1 fruiting body extractOne dose, tested at 90 minutesNo benefit found
    Docherty 2023UK, focus and thinking41 healthy adults aged 18 to 451.8 g a dayCapsules of a commercial lion’s mane blend28 daysMixed
    La Monica 2023USA, focus and thinking40 healthy adults aged 18 to 501 g, single doseFruiting body powderOne dose, tested at 1 and 2 hoursMixed
    Grozier 2022USA, focus and thinking24 healthy college-age adults10 g a dayFruiting body baked into muffins4 weeksNo benefit found
    Li 2020Taiwan, memory41 people with mild Alzheimer’s disease1.05 g a day (3 × 350 mg)Mycelium enriched in erinacine A49 weeksBenefit found
    Saitsu 2019Japan, memory31 adults over 50 (average age 61)3.2 g a dayFruiting body powder tablets12 weeksMixed
    Vigna 2019Italy, mood and sleep77 adults with overweight or obesity on a low-calorie diet1.5 g a dayCapsules: mycelium plus fruiting body extract8 weeksBenefit found
    Nagano 2010Japan, mood and sleep26 women with general health complaints (average age 41)2 g a dayFruiting body baked into cookies4 weeksMixed
    Mori 2009Japan, memory30 adults aged 50 to 80 with mild cognitive impairment3 g a dayFruiting body powder tablets16 weeksBenefit found

    Wild lion’s mane is protected in Britain

    It is one of the few fungi listed under the Wildlife and Countryside Act 1981, so picking it in the wild is against the law. Every lion’s mane you can legally eat or buy in the UK is cultivated, usually on sawdust or grain.

    What the law says
    A rounded, golden lion’s mane mushroom tucked inside the hollow of an old tree trunk
    Wild lion’s mane in a hollow trunk, Hampshire. Photo: Simon Colenutt, CC BY 4.0

    Start here

    Six guides, in the order most people need them: what it is, what it does, whether it is safe, how to take it and how to buy it.

    1. A white lion’s mane mushroom with a fringe of short hanging spines growing from the side of a tree in England
      What is lion's maneWhat lion's mane is, where it grows, what is in it and how it ended up in UK supplements, from an independent, evidence-led guide.
    2. Two lion’s mane fruiting bodies hanging from a dead trunk, their long cream spines lit against a dark woodland background
      Benefits and evidenceEvery common lion's mane claim, from memory to nerve repair, graded against the human trials. Most rest on animal studies; a few have small trials.
    3. A pale lion’s mane mushroom on a tree trunk in a dim Devon woodland, beside a bracket fungus
      SafetyLion's mane looks safe for most adults at trial doses. The known risks: mushroom allergy, stomach upset, and too little data for pregnancy or medicines.
    4. A creamy-white lion’s mane mushroom growing out of a hollow log, with leaves and clover around it
      How to take itCapsules, powder, extract, tincture, coffee or fresh mushroom: how to take lion's mane, the doses used in trials and how long to give it.
    5. A lion’s mane mushroom with a dusting of soil, growing low on a stump among fallen beech leaves
      Buying guideWhat to look for on a lion's mane label in the UK: fruiting body or mycelium, beta-glucans, extract ratios, lab tests, and claims sellers cannot legally make.
    6. Close-up of the underside of a lion’s mane mushroom: hundreds of soft white spines, tipped with orange, hanging in rows
      The human trialsEvery published human trial of lion's mane on its own, with who took part, the dose, the result and the caveats, kept up to date as new trials appear.

    Photographs from iNaturalist: ionafraser (CC BY 4.0), Maciej Boenisch (CC BY 4.0), Shane Austin (CC BY 4.0), James Carr (CC BY 4.0), iNaturalist contributor (CC0), Michael Warner (CC BY 4.0).

    Questions people ask

    Short answers, each linked to the guide that explains it in full.

    Is lion's mane a magic mushroom?

    No. Lion's mane contains no psilocybin or any other psychedelic compound, and it is legal to buy and eat in the UK. It is an ordinary edible mushroom that some people take as a supplement.

    Does lion's mane actually work?

    For some things, possibly. Three small trials in older adults with mild memory problems or early Alzheimer's found modest improvements on memory tests. In healthy young adults most trials found little or no effect. Many popular claims have never been tested in people.

    Is it safe to take lion's mane every day?

    The longest trial gave about 1 g a day of mycelium extract for 49 weeks and reported no serious side effects. Daily use at trial doses appears safe for most adults, but there is no data beyond a year.

    What is the best lion's mane supplement in the UK?

    We do not rank or recommend brands, because we take no money from sellers. The best product is one that tells you which part of the mushroom it uses, gives a beta-glucan figure from a named test, and publishes a recent lab report for contaminants.

    How many human studies are there on lion's mane?

    We count ten published trials of lion's mane on its own, as of November 2026. There are also a few studies of multi-ingredient products that contain lion's mane, which we leave out because their results cannot be put down to lion's mane alone.