Last updated: October 2026
Lion’s mane is an edible mushroom popular for focus and memory. Small human studies suggest it may support thinking in older adults with mild memory problems and may modestly ease stress, but the evidence is still early. Most studies used 1 to 3g a day. It is generally well tolerated; avoid it if you are allergic to mushrooms.
This guide covers what lion’s mane is, what the research really shows, benefits for men and women, ADHD, how much to take per day, how long it takes, side effects, and whether it is psychoactive or shows up on a drug test.
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.
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.
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.
Our honest take: lion’s mane is a promising, well-tolerated mushroom with early human evidence for memory, focus and mood. It is worth trying if you are curious, but expect subtle effects over weeks rather than a dramatic change.
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 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.
- Do not stop or change ADHD medication without speaking to your doctor.
- Do not give lion’s mane supplements to children without medical advice.
- If you are an adult with ADHD and want to try it alongside your usual care, tell your GP or ADHD team.
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.
Lion’s mane vs reishi, cordyceps and ashwagandha
| Main reason people take it | Usual time of day | Read more | |
|---|---|---|---|
| Lion’s mane | Focus and memory | Morning | This guide |
| Reishi | Winding down, evening routine | Evening | Reishi mushroom |
| Cordyceps | Energy and exercise | Morning or before exercise | Cordyceps |
| Ashwagandha (a herb, not a mushroom) | Stress | Morning, evening or split | When to take 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:
| Study | Amount per day | Length |
|---|---|---|
| Memory in older adults | 3g dried powder | 16 weeks |
| Focus in young adults (Northumbria) | 1.8g | Single dose and 28 days |
| Mood in women | Lion’s mane cookies (small amount) | 4 weeks |
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 side effects and safety
Lion’s mane is an edible mushroom and was well tolerated in the human studies above, with no adverse effects reported in the 16-week memory trial. Possible side effects include:
- Stomach upset or loose stools, especially at higher doses
- Allergic reactions, such as skin rashes or, rarely, breathing problems. Avoid it if you are allergic to mushrooms.
- Headaches or feeling wired, occasionally reported online but not in trials
Searches about lion’s mane and the liver are common, but there is no clear evidence of liver harm in people. As with any supplement, stop if you notice yellowing skin, dark urine or tummy pain, and see a doctor.
Check with your GP or pharmacist first if you:
- are pregnant or breastfeeding
- take blood thinners or have a bleeding disorder, as lab studies suggest lion’s mane may affect blood clotting
- take diabetes medicine, as animal studies suggest it may lower blood sugar
- are due to have surgery
Is lion’s mane psychoactive, addictive or on a drug test?
Is lion’s mane psychoactive?
No. Lion’s mane is not a “magic” mushroom. It contains no psilocybin, has no hallucinogenic effects and is not a controlled substance in the UK.
Does lion’s mane show up on a drug test?
No. Standard drug tests look for substances such as THC, opioids, amphetamines and psilocybin. Lion’s mane contains none of these, so it will not cause a positive result. If you take a blend, check the other ingredients.
Is lion’s mane addictive?
No. There is no evidence that lion’s mane causes tolerance, dependence or withdrawal, and you can stop taking it at any time. It is not a substitute for medication, so if you take antidepressants, speak to your GP before making any changes.
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 lab testing for heavy metals and contaminants.
- 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 and cordyceps vs lion’s mane, or read the best mushrooms for anxiety. Our reishi cacao is our evening mushroom.
See best mushroom supplement UK for how to choose a good product.
FAQs
What is lion’s mane good for?
Lion’s mane is mostly taken for focus, memory and mood. Small human studies suggest it may support thinking in older adults with mild memory problems and modestly ease stress, but the evidence is still early.
What does lion’s mane do to the brain?
Lion’s mane contains hericenones and erinacines, which in lab studies encourage nerve growth factor, a protein that helps maintain nerve cells. In people, small studies have found modest improvements in memory scores and focus.
How much lion’s mane should I take per day?
Studies used 1.8 to 3g a day of lion’s mane powder. Start around 1g and build up if you tolerate it. Concentrated extracts are stronger, so follow the product label.
What are the side effects of lion’s mane?
It is generally well tolerated. Possible side effects include stomach upset and, rarely, allergic reactions such as skin rashes. Avoid it if you are allergic to mushrooms, pregnant or breastfeeding.
Does lion’s mane help with ADHD?
There are no human studies of lion’s mane in ADHD. Don’t change ADHD medication or give it to children without speaking to a doctor.
Can you take lion’s mane every day?
Yes. The human studies used it daily for up to 16 weeks with no reported adverse effects. Longer-term research is limited.
Does lion’s mane show up on a drug test?
No. Lion’s mane contains no THC, psilocybin or other substances that drug tests look for.
Is lion’s mane better than reishi?
They suit different times of day. Lion’s mane is usually taken in the morning for focus, while reishi is taken in the evening as part of a wind-down routine.
Should I take lion’s mane in the morning or at night?
Either. Most people take it in the morning for focus, often with breakfast. It isn’t a stimulant or a sedative, so consistency matters more than the time.
Does lion’s mane help you sleep?
There’s little research. One small study linked 8 weeks of lion’s mane with better reported night-time rest in people with overweight. Reishi is more often used for evenings.
Is lion’s mane coffee worth it?
It’s convenient, but many blends contain far less lion’s mane per cup than the 1 to 3g a day used in studies. Check the label.
Sources
- Mori K et al (2009). Improving effects of the mushroom Yamabushitake (Hericium erinaceus) on mild cognitive impairment: a double-blind placebo-controlled clinical trial. Phytotherapy Research.
- Docherty S et al (2023). The acute and chronic effects of lion’s mane mushroom supplementation on cognitive function, stress and mood in young adults. Nutrients.
- Nagano M et al (2010). Reduction of depression and anxiety by 4 weeks Hericium erinaceus intake. Biomedical Research.
- Li IC et al (2020). Prevention of early Alzheimer’s disease by erinacine A-enriched Hericium erinaceus mycelia: pilot double-blind placebo-controlled study. Frontiers in Aging Neuroscience.
- Vigna L et al (2019). Hericium erinaceus improves mood and sleep disorders in patients affected by overweight or obesity. Evidence-Based Complementary and Alternative Medicine.
This guide is general information, not medical advice.
