- 01Nerve growth factor in a dish is not new brain cells in you
The reason lion's mane is famous is that hericenones and erinacines raise nerve growth factor in cells and animals. Nobody has shown that happening in a living human brain. What trials in people measured was scores on memory and mood questionnaires, and those gains were modest, came from small studies, and faded within weeks of stopping.
- 02The studied amount is several capsules, not one
The trials that reported memory gains used about 3 g of mushroom powder a day for 12 to 16 weeks. Typical capsules, including LifeFrom's at 500 mg, hold a fraction of that, so a result from a trial does not transfer to a single capsule.
Lion's mane (Hericium erinaceus) is an edible mushroom that looks like a white, shaggy mane, and it is sold for memory, focus and mood. The evidence in people is early and small. In randomized trials (studies that assign people by chance to the real thing or a dummy), older adults with mild memory decline scored modestly better on memory tests after 12 to 16 weeks in trials that used about 3 g a day of mushroom powder, and younger adults saw small, mixed effects on focus and stress 125. The famous claim, that it grows nerves, comes from cells and animals, not from human brains 13. It is generally well tolerated, though allergy and one serious lung reaction have been reported 10.
What is lion's mane?
Lion's mane is a mushroom that grows on hardwood trees, called yamabushitake in Japan, where most of the early human trials were run 1. For the basics, what it is and what it does in your body has its own page, and this guide covers the evidence, how much studies use, when and how to take it, fruiting body vs mycelium, side effects and interactions.
Its reputation rests on two families of compounds. Hericenones come mainly from the fruiting body, the part you would recognize as the mushroom; erinacines come mainly from the mycelium, the network of fine threads the mushroom grows from 813. In cell and animal studies, both make cells produce more nerve growth factor (NGF), a protein nerve cells rely on to grow and stay healthy, and erinacine A has shown effects in the central nervous system of rats 13.
How the lion's mane story is supposed to work, and where the evidence stops
What lion's mane is good for: the evidence, graded
Each use below gets a grade. Strong means several good randomized trials or a meta-analysis agree; Moderate means several randomized trials, mostly positive but small or short; Limited means few or small trials, or mixed results; Early means lab, animal or a single pilot study only; Not supported means good trials found no benefit. Our guide to how to read supplement evidence explains why a 30-person trial is a starting point rather than an answer.
| Use | What the research found | Evidence | Source |
|---|---|---|---|
| Memory in older adults with mild memory decline | 30 adults aged 50 to 80: better scores at weeks 8, 12 and 16 in a trial that used 3 g a day, falling after stopping; a 12-week trial on 3.2 g a day also found better MMSE scores. A review pooled MMSE gains of about 1.2 points. | Limited | 158 |
| Memory in mild Alzheimer's disease | One pilot of 49 people given erinacine A-enriched mycelium for 49 weeks reported better test scores than placebo. | Early | 4 |
| Focus and processing speed in healthy young adults | Faster on one focus test 60 minutes after 1.8 g; little change after 28 days. A larger single dose of extract showed no overall effect. | Limited (mixed) | 26 |
| Stress, anxiety and low mood | Lower depression and complaint scores after 4 weeks in 30 women; a trend toward less stress in young adults; in 84 young women, everyone improved, placebo included, and a lion's mane and reishi blend beat lion's mane alone. | Limited | 237 |
| Growing nerve cells (nerve growth factor) | Raised in cells and animals; never measured in a human brain. | Early | 13 |
| Gut bacteria | Small studies reported more diverse gut bacteria and more bacteria that make short-chain fatty acids. | Early | 8 |
| Blood sugar | A water extract lowered blood sugar in diabetic rats; no human trial. | Early | 11 |
Does lion's mane help memory?
The trial everyone cites took 30 Japanese adults aged 50 to 80 with mild cognitive impairment and gave half of them four 250 mg tablets of dried lion's mane powder three times a day (3 g a day) for 16 weeks 1. The lion's mane group scored higher than placebo on a dementia screening scale at weeks 8, 12 and 16, with scores climbing the longer people took it. Four weeks after stopping, the scores fell back significantly 1.
A 2019 Japanese trial ran 12 weeks on 3.2 g a day of fruiting body powder and found better scores on the Mini-Mental State Examination (MMSE, a 30-point memory and thinking screen), though not on two other memory tests 58. A 2025 systematic review pooled the MMSE results from two trials and found an average gain of about 1.17 points 8, a modest amount on a 30-point scale.
A Taiwanese pilot went a step further: 49 people with mild Alzheimer's disease were randomized to three 350 mg capsules a day of mycelium enriched with erinacine A, or placebo, for 49 weeks. The mycelium group did better on several cognitive tests and on everyday-living scores 4. It is one small pilot. Lion's mane is not a treatment for mild cognitive impairment or Alzheimer's disease, both of which are diagnosed and managed by a clinician, and it is never a swap for a prescribed medicine.
Does lion's mane help focus?
In 41 healthy adults aged 18 to 45, a single 1.8 g serving made people faster on the Stroop task (a test of attention and reaction speed) 60 minutes later; after 28 days of daily use, most measures showed no difference, and a few went slightly the wrong way 2. A 2025 crossover trial of 18 young adults gave a larger single dose (3 g of a 10:1 fruiting body extract) and found no overall effect on thinking or mood, with one isolated gain on a pegboard dexterity test 6.
Given the small sample size, these findings should be interpreted with caution.Docherty S and colleagues, Nutrients, 2023, on their lion's mane pilot trial 2
Does lion's mane help with stress and mood?
Thirty Japanese women ate cookies containing lion's mane fruiting body powder (the trial used about 2 g a day) or placebo cookies for 4 weeks; depression and general complaint scores fell in the lion's mane group 38. In the 2023 trial of young adults, there was a trend toward lower stress after 28 days that fell just short of statistical significance 2.
The newest and largest mood trial randomized 84 women aged 18 to 26 with stress or anxiety to 1.8 g of lion's mane, 1.8 g of a lion's mane and reishi blend, or placebo for 28 days 7. The blend lowered anxiety scores more than lion's mane alone, but everyone improved, placebo included, which the authors put down partly to the effect of taking part. Anxiety and depression are diagnosed and treated by clinicians; lion's mane is not a treatment for either, and it is never a swap for prescribed medicine or therapy.
How much lion's mane do studies use?
There is no recommended intake and no official upper limit for lion's mane. The amounts below are what trials gave, as history, not a dose for anyone reading. Most used whole fruiting body powder; one used mycelium enriched with erinacine A, and one used a concentrated extract, so the grams are not interchangeable.
| Use studied | Amount used | Form | How long | Source |
|---|---|---|---|---|
| Mild memory decline, ages 50 to 80 | 3 g a day (four 250 mg tablets, three times a day) | Dried fruiting body powder | 16 weeks | 1 |
| Memory, adults over 50 | 3.2 g a day | Fruiting body powder | 12 weeks | 58 |
| Mild Alzheimer's disease | About 1 g a day (three 350 mg capsules, with meals) | Mycelium enriched with erinacine A | 49 weeks | 4 |
| Mood and complaints, women | About 2 g used daily, in cookies | Fruiting body powder | 4 weeks | 38 |
| Focus, stress and mood, young adults | 1.8 g a day | Powder capsules | 28 days | 27 |
| Single-dose focus test | 3 g of a 10:1 extract, once | Fruiting body extract | One day | 6 |
No amount has been tied to harm in trials. The serious lung reaction on record involved a commercial lion's mane extract taken for about 4 months; the amount was not reported 10.
One LifeFrom capsule holds 500 mg of an organic lion's mane fruiting body and mycelia blend. That is about a sixth of the 3 g a day used in the memory trials and under a third of the 1.8 g used in the focus and mood trials 12. The label does not say how the 500 mg splits between fruiting body and mycelia.
When and how to take lion's mane
How lion's mane was used in the trials
No trial tested morning against evening, or with food against without; the Alzheimer's pilot gave capsules with meals 4, and the cookie trial built it into food 3. Lion's mane is not a stimulant, so there is no studied reason to avoid it later in the day.
How long does lion's mane take to work? In the memory trial, the first significant difference appeared at week 8 and grew to week 16 1. Mood trials ran 4 weeks 37. A single serving changed one focus test after an hour in one study 2 but not overall scores in another 6. Cycling (stopping and restarting on a schedule) has not been studied; the one trial with a follow-up found benefits faded once people stopped 1.
Fruiting body vs mycelium
Fruiting body or mycelium: what each brings
Lion's mane side effects
In trials, side effects were few and mostly mild. In the 16-week memory trial, mild stomach discomfort and loose stools happened in 7 people on lion's mane and 6 on placebo, with no change in laboratory blood tests 18. In the 49-week Alzheimer's pilot, four people dropped out for abdominal discomfort, nausea and skin rash 4. A 2025 review listed stomach discomfort, headache and allergic reactions as the potential side effects 8.
| Side effect | How common | What to do |
|---|---|---|
| Stomach discomfort, loose stools, nausea | Uncommon; about as often as placebo in one trial 1 | Usually settles; stop if it does not |
| Headache or skin rash | Occasional 48 | Stop it if a rash appears; see a clinician if it spreads |
| Allergic reaction | Possible with any mushroom | Swelling of the lips, tongue or throat, or trouble breathing, needs emergency care |
| Serious lung reaction (acute respiratory distress syndrome) | One case report, in a 63-year-old man in Japan, thought to be an immune reaction to a lion's mane extract 10 | A new cough with breathlessness, or trouble breathing, needs emergency care; stop the supplement and tell the team you took it |
The lung case is the only one of its kind on record: the man needed a ventilator and steroid treatment, recovered, and lab tests showed his immune cells reacted strongly to the lion's mane extract he had been taking 10. It is rare, and it is also the reason breathing symptoms on lion's mane deserve prompt attention.
Who should avoid lion's mane or ask first
- Pregnancy and breastfeeding: there are no safety studies, so this is one to raise with your obstetric clinician or midwife before using it.
- Children: there are no trials in children; ask a pediatrician.
- Mushroom or mold allergy: avoid it, or ask an allergist first.
- Rice allergy: the LifeFrom capsule lists myceliated brown rice among its other ingredients.
- Bleeding disorders or surgery coming up: a lion's mane compound slowed platelet clumping in the lab 9; tell your surgical team you take it.
- Diabetes: a lion's mane extract lowered blood sugar in diabetic rats 11; ask your clinician and keep checking your blood sugar as you usually do.
- New or worsening memory problems: see a clinician first. Low vitamin B12, thyroid disease, medicines, depression and other conditions can all cause memory loss, and blood tests for some of them are part of the usual workup 12.
Lion's mane interactions
No interaction between lion's mane and a medicine has been confirmed in people, and very little research has looked. The entries below come from lab and animal work, which is why the right step is a conversation, not a rule.
| Medicine | What can happen | Why | What to do |
|---|---|---|---|
| Blood thinners and antiplatelet medicines (warfarin, apixaban, rivaroxaban, clopidogrel, aspirin) | In theory, a little more bleeding or bruising | Hericenone B blocked collagen-triggered platelet clumping in rabbit and human platelets in the lab 9 | Ask the prescriber or pharmacist first; mention it before surgery or dental work |
| Insulin and other diabetes medicines | In theory, a further drop in blood sugar | A water extract lowered blood sugar and raised insulin in diabetic rats 11 | Talk to the prescriber; keep usual glucose checks |
| Any regular medicine | Unknown | Few interaction studies exist | Tell your pharmacist; absence of evidence is not evidence of safety |
Supplements to pair with lion's mane or keep apart
| Supplement | Together or apart | Why |
|---|---|---|
| Medicinal mushroom blend | Together is fine, but it doubles up | The 14-mushroom blend already contains lion's mane mycelia, in an undisclosed small amount |
| Rhodiola | Together is fine | Both sit in the Focus pack; no known interaction |
| L-theanine | Together is fine | Both sit in the Focus pack; no known interaction |
| Tyrosine | Together is fine | Both sit in the Focus pack; tyrosine has its own cautions with thyroid medicine and MAOIs |
| Magnesium | Together is fine | Both sit in the Focus pack; no known interaction |
| Omega-3 or nattokinase | Together, with care if you take a blood thinner | Each has its own bleeding caution; stacking several adds up on paper 9 |
| Cordyceps | Together is fine | No known interaction; both are sold as functional mushrooms |
Reishi deserves a note: in the 2026 trial, a lion's mane and reishi blend lowered anxiety scores more than lion's mane alone 7. It is one trial of a specific product, and reishi carries its own cautions, covered in our medicinal mushrooms guide.
Blood tests worth knowing about
No blood test measures lion's mane or shows whether it is working. If memory, focus or mood is what you want to change, a simple diary or a repeatable online memory test you do every few weeks tells you more than any lab value. The blood tests below matter for a different reason: they look for other causes of the symptoms, or for the people who should be careful.
| Marker | Why it matters with lion's mane | When it is usually checked |
|---|---|---|
| Vitamin B12 | Low B12 is a treatable cause of memory loss 12; ask your clinician whether it belongs in a memory workup. See B12 deficiency | When memory, numbness or tiredness raise the question, and regularly on metformin |
| TSH | Thyroid disease can cause memory trouble 12; see hypothyroidism and how to read a thyroid panel | Part of a usual memory or fatigue workup |
| Fasting glucose | For people on diabetes medicines, given the rat data 11 | Home monitoring and routine checks |
| HbA1c | The 3-month blood sugar average; see blood sugar explained | Every 3 to 6 months on diabetes treatment, or as your clinician advises |
| Platelet count | Lion's mane does not change the count; a low count is one reason a clinician may advise against anything that could affect clotting 9 | Routine blood count; see clotting tests explained |
A low B12, an abnormal TSH or a high glucose result goes to your clinician first, not to a supplement; each has its own treatment, and lion's mane is not one of them.
Lion's mane in the LifeFrom pouch
| In the LifeFrom pouch | |
|---|---|
| Product | Lion's Mane |
| What one serving holds | 1 capsule: Proprietary Blend Organic Lion's Mane Fruiting Body and Mycelia 500 mg |
| Form | Capsule, pullulan vegan capsule; other ingredients: organic myceliated brown rice (contains rice) |
| How it is packed | One serving in each of your 30 daily pouches, with up to 8 supplements per pouch |
| Price | $10.50 a month, plus the fixed $28.50 a month packing, handling and US delivery line for the whole pouch, not per supplement (prices as of November 2026, the shop shows the current price) |
| Curated packs that include it | Focus (with Rhodiola, Magnesium, Tyrosine and Theanine) |
One capsule holds 500 mg, well below the 1.8 to 3.2 g a day used in the trials 125, and the label does not state the fruiting body and mycelia split or any hericenone or erinacine content. The Mushroom Immune blend also contains lion's mane mycelia, so a pouch with both doubles up in a small way; nothing in the Focus pack is known to clash with lion's mane. You can see the shop and its packs.
This guide is general education, not medical advice. Supplements, lion's mane included, are not FDA-approved for safety or effectiveness, and the clinician who knows your history and medicines is the right person to decide whether lion's mane makes sense for you. For more on how we write about health, see our medical disclaimer.
Citations
- Mori K, Inatomi S, Ouchi K, Azumi Y, Tuchida T. Improving effects of the mushroom Yamabushitake (Hericium erinaceus) on mild cognitive impairment: a double-blind placebo-controlled clinical trial. Phytother Res. 2009;23(3):367-372.
- Docherty S, Doughty FL, Smith EF. 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;15(22):4842.
- Nagano M, Shimizu K, Kondo R, et al. Reduction of depression and anxiety by 4 weeks Hericium erinaceus intake. Biomed Res. 2010;31(4):231-237.
- Li IC, Chang HH, Lin CH, et al. Prevention of early Alzheimer's disease by erinacine A-enriched Hericium erinaceus mycelia pilot double-blind placebo-controlled study. Front Aging Neurosci. 2020;12:155.
- Saitsu Y, Nishide A, Kikushima K, Shimizu K, Ohnuki K. Improvement of cognitive functions by oral intake of Hericium erinaceus. Biomed Res. 2019;40(4):125-131.
- Surendran G, Saye J, Binti Mohd Jalil S, et al. Acute effects of a standardised extract of Hericium erinaceus (Lion's Mane mushroom) on cognition and mood in healthy younger adults: a double-blind randomised placebo-controlled study. Front Nutr. 2025;12:1405796.
- Smith EF, Docherty S. The effects of four-week supplementation of Lion's mane and a Lion's mane and Reishi blend on prioritised mood and wellbeing measures in young women. Front Nutr. 2026.
- Menon A, Jalal A, Arshad Z, Nawaz FA, Kashyap R. Benefits, side effects, and uses of Hericium erinaceus as a supplement: a systematic review. Front Nutr. 2025;12:1641246.
- Mori K, Kikuchi H, Obara Y, et al. Inhibitory effect of hericenone B from Hericium erinaceus on collagen-induced platelet aggregation. Phytomedicine. 2010;17(14):1082-1085.
- Nakatsugawa M, Takahashi H, Takezawa C, et al. Hericium erinaceum (yamabushitake) extract-induced acute respiratory distress syndrome monitored by serum surfactant proteins. Intern Med. 2003;42(12):1219-1222.
- Liang B, Guo Z, Xie F, Zhao A. Antihyperglycemic and antihyperlipidemic activities of aqueous extract of Hericium erinaceus in experimental diabetic rats. BMC Complement Altern Med. 2013;13:253.
- MedlinePlus Medical Encyclopedia. Memory loss. US National Library of Medicine.
- Li IC, Lee LY, Tzeng TT, et al. Neurohealth properties of Hericium erinaceus mycelia enriched with erinacines. Behav Neurol. 2018;2018:5802634.
Educational context only, not medical advice or a diagnosis. Always discuss your results with a clinician.
