Lion’s Mane Mushroom: Benefits, Side Effects

Lion’s Mane Mushroom: Benefits, Side Effects, And Supplements

The natural nootropic on everyone’s lips, but is this really a brain-boosting and mood-managing powerhouse?

Written by: Stephanie Anderson Witmer
Written on: July 29, 2025
Medically Reviewed by: Jared Meacham, PhD, RD, CSCS and Patricia Weiser, PharmD

Lion’s mane is the natural nootropic on everyone’s lips. But is this mushroom really a brain-boosting and mood-managing powerhouse? Here’s what the research says about lion’s mane benefits, and how to add this supplement into your daily routine.

What is lion’s mane mushroom?

Lion’s mane (Hericium erinaceus) is a white, shaggy-looking mushroom that does somewhat resemble hair or a lion’s mane — hence the name. It has other fun names, too, including bearded tooth fungus, monkey-head mushroom, and bearded hedgehog. It grows in parts of North America, Europe, and Asia, typically on dead hardwood trees. Lion’s mane is what’s known in the botany world as a saprotroph, meaning it assists the process of decay and feeds off of the non-living matter.

Lion’s mane mushroom has been used for centuries in traditional Chinese medicine. Today, you can find it in powders, pills, teas, coffees, chocolate, and certainly restaurant menus as a natural way to support the brain and the immune system, aid digestion, and improve mood.

“Lion’s mane is one of the most promising tools for modern nervous system and gut support, especially when used over time,” says functional medicine health consultant Iwona Meyer, MA, CFMHC, Dip CNM (Dist.), mANP, rGNC.

If you’re into wellness, you’ve undoubtedly heard about lion’s mane mushroom — and maybe even tried it yourself. The fab fungi feels like it’s everywhere, from farmers markets to chemist shops. Fans tout its benefits for focus, mood, and more.

But does it really help, or is it mostly hype? Here’s a breakdown of lion’s mane’s benefits, how it works, and whether it lives up to its reputation as king of the mushrooms.

Top health benefits of lion’s mane mushroom

What is lion’s mane good for? Perhaps the better question is: What isn’t it good for?

Lion’s mane is packed with powerful bioactive compounds that are anti-inflammatory, antioxidant, antimicrobial, and neuroprotective. These properties offer far-reaching benefits across the body.

“Lion’s mane has been part of my personal and clinical toolkit for years,” Meyer says. “It’s one of those mushrooms I always come back to when I need support with focus, nervous system health, or gut repair. I’ve seen it help clients in similar ways, whether they’re recovering from burnout, brain fog, or post-infection gut issues.”

Here’s what lion’s mane does in the body.

Cognitive enhancement and brain health

Lion’s mane is considered a natural nootropic: a substance that has benefits for the brain and cognitive function. The mushroom contains lots of powerful chemical compounds, including terpenoids called hericenones and erinacines. Erinacines cross the blood-brain barrier, and both have potential antioxidant, anti-inflammatory, and neuroprotective benefits.

Other compounds in the mushroom are phenolic acids, which can reduce oxidative stress. Polysaccharides (beta-glucans) support the immune system, lower inflammation, act as antioxidants, and may even have anti‑cancer effects.

The mushroom stimulates the production of nerve growth factor, a protein that’s crucial for the growth, maintenance, and survival of neurons. NGF is thought to play a role in memory formation and long-term brain health and may offer protection against Parkinson’s disease and Alzheimer’s disease.

A small randomised, double-blind, placebo-controlled study found that healthy younger adults ages 18 to 45 who consumed 1.8 g of lion’s mane had faster cognitive processing in the short term (60 minutes afterward) and a trend towards greater stress reduction over a longer term (28 days) than those who didn’t.

That said, not all studies have found cognitive benefits. For example, one small trial in college-aged adults found that taking lion’s mane daily for four weeks had no effect on thinking skills or metabolic flexibility, suggesting results may vary based on individual response.

May improve mood and reduce anxiety

Lion’s mane doesn’t just help you think better — it might also help you feel better.

While there’s not a ton of high-quality research in this area yet, the findings are promising.

A small, older study found that menopausal women who consumed lion’s mane cookies for four weeks reported reduced anxiety and irritation compared to a placebo group. Another study found significant improvements in depressive-anxious symptoms and in sleep quality in overweight adults after consuming lion’s mane extract for eight weeks.

Lion’s mane’s anti‑inflammatory properties and action on BDNF may help regulate serotonin, dopamine, and norepinephrine to further boost mood.

“What makes lion’s mane so special is its unique ability to support both the gut–brain axis and the regeneration of nerve tissue, offering benefits not just for memory and mood, but also for the microbiome and emotional resilience,” Meyer says.

Digestive health benefits

Nutritional therapist and health coach Khadija Sami, DipCNM, regularly uses lion’s mane in her own practice, as well. “I’ve found lion’s mane especially beneficial for individuals dealing with gastrointestinal issues,” she says.

Sami adds that lion's mane has well-documented anti-inflammatory properties and supports the healing of intestinal permeability (AKA “leaky gut”). It’s a good source of prebiotic fibre, which is food for beneficial gut bacteria.

Immune system support

Between 70% to 80% of our immune cells live in our gut. Lion’s mane’s role in gut health may also include supporting immunity. Research suggests lion’s mane increases the activity of the intestinal immune system.

Nerve regeneration and neurological support

Perhaps the most fascinating and promising effect of lion’s mane is its neuroregenerative potential. While human studies are still limited, the early data is encouraging.

Heart health and inflammation

The anti-inflammatory properties of lion’s mane could also play a role in reducing chronic inflammation — a major contributor to heart disease.

How to use lion’s mane for maximum benefits

With so many products containing lion’s mane on the market, it can be difficult to know which one to choose. Here’s a rundown of the options:

Suggested dosage

There are no established dosage recommendations for lion’s mane. Every product has different dosages, so be sure to read labels carefully. Always start low and follow product-specific instructions.

Are there side effects or precautions?

Lion’s mane is generally considered safe and well-tolerated. However, a few considerations apply:

Who should consider taking lion’s mane?

Lion’s mane is generally considered to be safe for anyone. With anything, quality and dosage matter. This mushroom may be especially useful for:

The bottom line

If you’re looking for a safe, all-natural nootropic (that also happens to be packed with other good-for-you nutrients), lion’s mane mushroom might be just the ticket. Lion’s mane is a well-known tool for better focus and concentration, but the powerful compounds in lion’s mane can also strengthen cognitive function, boost mood, improve gut health, and support the immune system.