Lion’s Mane: Benefits, How Much to Take, Side Effects and ADHD (UK Guide)

What is lion’s mane?

Lion’s mane (Hericium erinaceus) is a white, shaggy mushroom that grows on hardwood trees in North America, Europe and Asia. It is rare in the wild in the UK, where it is a protected species and must not be picked, so supplements and fresh mushrooms come from cultivated crops. It has been eaten and used in traditional East Asian practice for centuries, and it is now one of the most popular functional mushrooms, sold as powders, capsules, coffees, teas and gummies.

Prefer your mushrooms in a mug? Our guide to mushroom hot chocolate in the UK shows what to check on the label, including which mushroom, how much per serving and the caffeine.

Lion’s mane is often sold as a nootropic. For the wider picture, see our nootropics UK guide: what they are, what is legal and what the evidence shows.

It contains compounds called hericenones and erinacines, which in lab studies encourage the production of nerve growth factor, a protein involved in maintaining nerve cells. That is the main reason researchers are interested in it for the brain.

Is lion’s mane an adaptogen?

Lion’s mane is often grouped with adaptogens, plants and mushrooms thought to help the body cope with stress, alongside reishi, cordyceps and ashwagandha. “Adaptogen” is a marketing and traditional term rather than a scientific category, but it is a helpful way to think about where lion’s mane fits: a gentle, daily supplement rather than a quick fix. Read more in what are adaptogenic mushrooms?

Lion’s mane benefits: what the research shows

Lion’s mane has a lot of lab and animal research, but only a few small human trials. Here is what those human studies found.

Is lion’s mane good for you?

As a food, yes: it is an edible mushroom that has been eaten in East Asia for centuries, and it was well tolerated in the trials below. As a supplement, the honest answer is “maybe”. The human studies are small and short, the results were modest, and none of them shows a clear effect in everyday life. No health claims for lion’s mane are authorised in the UK, so treat any product promising sharper memory or focus with caution.

The same goes for lion’s mane supplement and powder benefits. The trials used tablets of dried mushroom powder, cookies made with it and capsules, so a powder or capsule is simply a measured way to take the amounts studied.

Memory in older adults

In a Japanese trial, 30 adults aged 50 to 80 with mild memory problems took 3g of lion’s mane powder a day or a placebo for 16 weeks. The lion’s mane group scored higher on a thinking and memory test at 8, 12 and 16 weeks. Four weeks after stopping, their scores fell again, which suggests any benefit depends on taking it regularly.

A separate 2020 pilot trial gave people with mild Alzheimer’s disease capsules of lion’s mane mycelium enriched with a compound called erinacine A for 49 weeks. The lion’s mane group did better than placebo on some memory and thinking tests. It was small and used a specialised extract, so it doesn’t mean everyday supplements will have the same effect.

Focus and stress in young adults

A pilot study at Northumbria University gave 41 healthy adults aged 18 to 45 either 1.8g of lion’s mane or a placebo. An hour after a single dose, the lion’s mane group was quicker on a focus task. After 28 days there was a trend towards lower stress, though it fell just short of statistical significance. The researchers called the findings tentative.

Mood

In a small Japanese study, 30 women ate cookies containing lion’s mane or a placebo for four weeks. The lion’s mane group reported lower depression and anxiety scores. It was a small, short study, so treat it as a promising early sign.

Immunity, inflammation, cholesterol and cancer research

You will see claims online about immunity, inflammation, cholesterol and even cancer. These come from lab and animal studies only. Lion’s mane is not a treatment for any illness, and there is no good evidence that it prevents or treats cancer in people. For the wider picture, see mushrooms for inflammation.

Lion’s mane benefits for men and women

The research has not found different benefits for men and women. Both took part in the memory and focus studies above, and the mood study was in women.

• Women: some take lion’s mane during perimenopause for focus and mood, and the small mood study above was in women. Avoid it if you are pregnant or breastfeeding, as there isn’t enough safety research.
• Men: lion’s mane is mostly taken for focus and as part of a coffee or morning routine. Unlike ashwagandha, there is no good evidence that it affects testosterone.

Lion’s mane and ADHD

“Lion’s mane for ADHD” is one of the fastest-rising searches in the UK, but there are no published human studies of lion’s mane in ADHD, in adults or children. The interest comes from the focus and nerve growth research above, plus personal stories online. Lion’s mane is not a treatment for ADHD and is not an alternative to ADHD medication.

What the research actually shows

• No human ADHD trials. When we searched the medical research database PubMed in October 2026, we found no clinical trials of lion’s mane in people with ADHD.
• One lab and computer study. The only ADHD-specific paper, from 2025, tested a lion’s mane extract on cells in a dish and used computer modelling to predict how its compounds might bind to a brain protein. That is an early research step and can’t tell us whether lion’s mane does anything for people with ADHD.
• The focus study wasn’t about ADHD. The Northumbria pilot above was in 41 healthy young adults, and its findings were described as tentative by the researchers themselves.

Lion’s mane and ADHD medication

There are no studies of lion’s mane taken alongside ADHD medicines such as methylphenidate or lisdexamfetamine. On the NHS, ADHD medicines are started and monitored by an ADHD specialist, and the dose is worked out carefully for each person. So:

• Do not stop, reduce or replace ADHD medication with lion’s mane or any other supplement.
• Speak to your ADHD team, GP or pharmacist before adding any supplement to your routine.
• Do not give lion’s mane supplements to children or teenagers. There is no safety research in under 18s.

Is there a lion’s mane dosage for ADHD?

No. Because there are no ADHD trials, there is no researched dose for ADHD. The amounts in the dosage section below come from studies of memory, focus and mood in people without ADHD, so they shouldn’t be read as an ADHD dose. If ADHD affects your sleep, our guide to ADHD and sleep covers the everyday basics that help.

When to take lion’s mane: morning or night?

There’s no proven best time. Studies gave it daily, usually split across meals. Most people take lion’s mane in the morning or early afternoon because they use it for focus and work, often with breakfast or a coffee. It isn’t a stimulant or a sedative, so taking it later is fine if that suits your routine better. Taking it at the same time every day matters more than the hour.

Does lion’s mane help you sleep?

There’s little research. A small Italian study of 77 people with overweight on a low-calorie diet found that 8 weeks of lion’s mane was linked with better mood and better reported night-time rest. That’s an early signal in a specific group, not proof. For evening routines, reishi is the mushroom people more often choose. See reishi for sleep.

Lion’s mane coffee: is it worth it?

Lion’s mane coffee is regular or instant coffee mixed with lion’s mane powder or extract. It’s a convenient way to fit lion’s mane into a morning routine, but check the label: many blends contain only a few hundred milligrams of lion’s mane per cup, well below the 1 to 3g a day used in most studies. You also still get the caffeine. If you want a study-level amount, a separate capsule or powder alongside your usual coffee is easier to measure. See mushroom coffee and coffee crash.

Are there lion’s mane coffee benefits?

There are no studies of lion’s mane coffee itself. Any effect would come from the amount of lion’s mane in the cup plus the coffee you would be drinking anyway, so a blend with a few hundred milligrams per serving is unlikely to match the trials.

Lion’s mane vs reishi, cordyceps and ashwagandha

For the full side-by-side, see lion’s mane vs reishi vs cordyceps. If brain fog is your main concern, start with the basics in brain fog: causes and what helps, and see how to focus better.

How much lion’s mane should you take per day?

There is no official dose. The human studies used:

A sensible approach is to start at around 1g a day and build up to 1 to 3g of fruiting body powder if you tolerate it well. Concentrated extracts are stronger gram for gram, so always follow the label of the product you buy rather than a general figure.

How long does lion’s mane take to work?

It depends on what you are looking for. In the Northumbria study, people were slightly quicker on a focus task an hour after a single dose. For memory, the benefits in the older adults study built up over 8 to 16 weeks and faded within a month of stopping. Give it at least four to eight weeks of daily use before judging it.

How to take lion’s mane

• Fresh mushrooms: slice and fry until the outside is golden and crisp. Undercooked lion’s mane can taste bitter. It has a mild, almost seafood-like flavour.
• Powder: stir into coffee, smoothies, porridge or soups.
• Capsules: the easiest way to get a consistent amount.
• Mushroom coffee and tea: a popular morning swap. See mushroom coffee and how to make mushroom tea.
• Gummies: convenient, but check how much lion’s mane each one actually contains.

Most people take it in the morning or early afternoon for focus. Take it with food if it upsets your stomach.

Lion’s mane powder vs capsules vs gummies

To match the amounts used in the research, powder or capsules are the practical choice.

Cooking lion’s mane mushrooms

Lion’s mane is a food first, and fresh lion’s mane is one of the nicest mushrooms to cook. It has a mild, slightly sweet flavour and a soft, stringy texture that many people compare to crab or lobster, which is why it turns up in vegan “crab” cakes.

Where to buy fresh lion’s mane in the UK

Look for it at farmers’ markets, greengrocers and delis with a speciality mushroom range, and from UK mushroom farms that sell online. Grow-at-home kits are another option. Don’t pick it in the wild: it is one of only four fungi protected under Schedule 8 of the Wildlife and Countryside Act 1981. Choose firm, white mushrooms and avoid any that look yellow, brown or soggy.

How to cook lion’s mane

1. Clean: brush or wipe it rather than rinsing, as it soaks up water. Trim any discoloured bits.
2. Tear or slice: tear it along the grain into strips for stir-fries, pasta and tacos, or cut thick slices for “steaks”.
3. Dry-fry: put it in a hot, dry pan for a few minutes, pressing down gently, to drive off the water.
4. Add fat: once it stops steaming, add butter or oil and fry until golden and crisp at the edges, about 2 minutes a side.
5. Season: finish with garlic, salt, pepper and a squeeze of lemon, or a splash of soy sauce.

Cook it through: raw lion’s mane is tough and can taste bitter. Store it unwashed in a paper bag in the fridge and use it within a few days.

Lion’s mane side effects

Lion’s mane is generally well tolerated. The side effects most often mentioned are stomach discomfort, headache and allergic reactions, and a 2025 systematic review of the human research noted that side effects are rarely reported at all. Serious reactions are very rare, but a few have been described in medical journals.

Allergic reactions: the case reports

Two published cases show that, like any food, lion’s mane can trigger an allergic reaction in a small number of people:

• Lungs (Japan, 2003): a 63-year-old man developed severe breathing failure and needed intensive care. Tests showed a strong immune reaction to a lion’s mane extract he had been taking for about four months. He recovered with steroid treatment. It is the only report of its kind we found, but it is a reason to stop straight away if you notice a new cough or breathlessness.
• Skin (the Netherlands, 1999): doctors reported allergic contact dermatitis, an itchy skin rash, in a person who handled lion’s mane mushrooms at work.

Avoid lion’s mane if you have reacted to mushrooms before.

Lion’s mane side effects: headaches, anxiety and sleep

Some people online say lion’s mane makes them feel wired, anxious or restless, or affects their sleep. These effects haven’t been seen in the trials, and lion’s mane itself contains no caffeine. If you take it as a lion’s mane coffee or a “focus” blend, the caffeine or other stimulants in the mix are the more likely cause. See does caffeine cause anxiety? and feeling overstimulated.

Lion’s mane and the liver

Searches about lion’s mane and the liver are common, but there is no clear evidence of liver harm in people, and laboratory tests in the 16-week memory trial showed no adverse effects. As with any supplement, stop if you notice yellowing skin or eyes, dark urine or tummy pain, and see a doctor.

Is lion’s mane safe?

For most healthy adults, lion’s mane appears safe to eat as a food and to take at the amounts used in studies, up to 3g of dried powder a day for 16 weeks. Long-term safety research is limited, though, and some people should check with a GP or pharmacist first or avoid it altogether.

Who should avoid lion’s mane or check first

• Pregnancy and breastfeeding: there is no safety research, so avoid it.
• Children and teenagers: there is no safety research in under 18s, so we don’t recommend lion’s mane supplements for them.
• Mushroom allergy: avoid it if you have reacted to mushrooms before.
• Blood thinners, bleeding disorders or upcoming surgery: in a lab study, a compound from lion’s mane called hericenone B reduced platelet clumping, which is part of how blood clots. It hasn’t been tested in people, but check first.
• Diabetes medicines: a 2013 study found that a lion’s mane extract lowered blood sugar in diabetic rats over 28 days. Animal results don’t always apply to people, but if you take medicine to lower blood sugar, check first.
• Any regular medication: there are no human studies of lion’s mane interactions with medicines. Ask your GP or pharmacist, and for antidepressants or ADHD medicines speak to the person who prescribes them.

How much lion’s mane is too much?

There is no official safe upper limit. The human studies used 1.8 to 3g a day of dried mushroom, so going well beyond that takes you outside what has been studied. Concentrated extracts vary a lot in strength, so follow the label of the product you buy rather than a general figure, and don’t double up on several lion’s mane products at once.

Quality: what’s actually in the tub

Most safety worries with mushroom supplements are about the product rather than the mushroom. Some powders are made from mycelium (the root-like part) grown on grain, and the finished powder can contain a lot of that grain. A 2025 laboratory comparison of chaga supplements, for example, found that products made from mycelium grown on grain were rich in starch rather than mushroom compounds. Look for the fruiting body on the label, a stated amount per serving and third-party lab testing for heavy metals and contaminants. Our buying checklist below covers this in more detail.

Does lion’s mane show up on a drug test?

No. Lion’s mane contains no THC, psilocybin, opiates, amphetamines or any other controlled drug, and its own compounds are not what drug tests are designed to detect. Pure lion’s mane should not cause a positive result. The small real risk comes from blends, or from a product that is mislabelled or contaminated with something else.

What drug tests actually look for

There is no single official UK drug testing panel: each employer or testing company chooses what to screen for. Tests look for specific drugs or their breakdown products, such as THC from cannabis, cocaine and opiates. Police roadside kits, for example, screen for cannabis and cocaine. The active compounds in lion’s mane, such as hericenones, erinacines and beta-glucans, are not on these lists, and we found no published reports of lion’s mane causing a false positive.

Workplace drug tests

In the UK, employers need your consent to test you, usually through a drug and alcohol policy in your contract or staff handbook. If you are tested, it is sensible to tell the tester about any supplements you take and keep the packaging, so the ingredients can be checked if a result is ever queried.

Sport and military drug tests

Sport testing works differently. Under anti-doping rules, athletes are responsible for any banned substance found in their body, however it got there. UK Anti-Doping says there are no guarantees that any supplement is free from banned substances, because products can be contaminated during manufacturing and labels can be wrong. Its advice is to speak to a qualified professional first and, if you do use a supplement, choose a batch-tested product and check the batch number. The same caution makes sense for military and other strict testing.

Blends and “nootropic stacks”

Many focus products mix lion’s mane with other ingredients, including caffeine and other stimulants, and some mushroom blends are sold alongside hemp or CBD. Read the full ingredient list. If a product contains CBD, see our guide to CBD and drug tests, because the THC question there is different.

Is lion’s mane addictive?

No. Lion’s mane is not a stimulant or a controlled drug, and there is no evidence that it causes cravings, tolerance or withdrawal. You can stop taking it at any time. In the 16-week memory trial, people’s test scores simply drifted back down in the four weeks after they stopped, which is what you would expect when any benefit depends on taking it regularly.

We found no published reports of lion’s mane dependence. If you take antidepressants or other medicines, lion’s mane is not a substitute for them, so speak to your GP before making any changes. For how other everyday substances compare, see is CBD addictive? and caffeine withdrawal.

Is lion’s mane psychoactive?

No. Lion’s mane is not a “magic” mushroom. Magic mushrooms contain psilocybin and psilocin and are a Class A drug in the UK. Lion’s mane contains neither, has no hallucinogenic effects and is not a controlled substance.

Is lion’s mane a stimulant?

No. It contains no caffeine and doesn’t act like a stimulant or a sedative. If a lion’s mane coffee or blend makes you feel jittery, check how much caffeine it contains.

Is lion’s mane legal in the UK?

Yes. It is legal to buy, cook and eat cultivated lion’s mane and to take lion’s mane supplements. The one thing that is illegal is picking it in the wild, because wild lion’s mane is a protected species (see where to buy fresh lion’s mane).

How to choose a lion’s mane supplement

• Fruiting body vs mycelium: the human studies mostly used the fruiting body (the mushroom itself). Products grown on grain may contain a lot of grain filler.
• Check the amount per serving and whether it is a powder or a concentrated extract.
• Look for third-party lab testing for heavy metals and contaminants, and batch testing if you are tested for sport.
• Check the full ingredient list of blends for caffeine, other stimulants or hemp ingredients.
• Gummies: often contain less mushroom than you would expect, plus sugar.

Lion’s mane is usually taken in the day, while reishi suits the evening. Compare them in lion’s mane vs reishi vs cordyceps, or read the best mushrooms for anxiety. Our reishi cacao, a reishi hot chocolate, is our evening mushroom drink. The cacao contains a little natural caffeine, so it isn’t caffeine-free.

Related guides

• See best mushroom supplement UK for how to choose a good product.
• ADHD and sleep: what helps.
• For how lion’s mane compares with CBD, caffeine and L-theanine for studying, see CBD for focus and studying.
• Shiitake mushroom side effects and benefits.
• Taking it for menopause brain fog? See mushrooms for menopause: none of the lion’s mane trials were in menopausal women.
• Thinking of gummies? Our guide to lion’s mane and mushroom gummies compares the amount per gummy with the doses used in studies.
• For how lion’s mane stacks up against caffeine, creatine and other focus supplements, see our evidence table.
• For chaga, which is usually brewed as a tea, see our chaga mushroom guide.
• If you enjoy cooking speciality mushrooms, our maitake mushroom guide covers hen of the woods, from roasting to where to buy it in the UK.
• For CBD, which people also ask about, see CBD and ADHD: what the research shows.
• What’s in Trip Mindful Blend, a magnesium drink with 100mg of lion’s mane per can.
• Spacegoods ingredients, a mushroom drink listing 1,000mg of lion’s mane per scoop.
• DIRTEA coffee, cacao and chai, which all list lion’s mane.
• Rheal Superfoods, which uses lion’s mane in Shroom Coffee, Magic Matcha and Brain+.
• Lion’s mane is the main mushroom in Four Sigmatic’s mushroom coffee, which lists 50mg of caffeine per instant serving.
• See what lion’s mane at Holland and Barrett sells, from own-brand capsules to gummies and powder.
• Comparing lion’s mane capsules? Our Hifas da Terra Mico-Leo facts show how one brand labels a fruiting body extract.
• Lion’s mane is also one of 10 mushrooms in Ankhway mushroom gummies, at 250mg dried-mushroom equivalent per two gummies.
• For another mushroom often sold alongside lion’s mane, see turkey tail: research, side effects and interactions.
• For a different option people try for focus, see our guide to L-theanine benefits, which rates 31 trials.