Lion’S Mane And Neural Connectivity — What The Scans Show

Lion’s Mane and Neural Connectivity: What the Scans and Studies Actually Show

What if a mushroom that looks like a white pompom could genuinely change the way your neurons talk to each other? It sounds like the kind of claim you’d see on a dubious wellness website, sandwiched between alkaline water and crystal healing. But the science behind *Hericium erinaceus*, lion’s mane, is considerably more interesting than most supplement stories, and considerably more complicated than its enthusiastic fans tend to admit. Vitacuity reviewed over 1.77 million research papers to bring you the most relevant findings on this topic. Here’s what the evidence actually shows, and where it runs out.

The Science Behind Lion’s Mane: How It Might Rewire Your Brain

To understand why researchers are excited about lion’s mane, you need to understand two proteins that sit at the heart of brain health: Nerve Growth Factor (NGF) and Brain-Derived Neurotrophic Factor (BDNF).

Think of NGF as your brain’s maintenance crew. It keeps neurons alive, supports their growth, and is especially critical for the parts of your brain involved in memory and learning, particularly the basal forebrain cholinergic system, which is one of the first regions to deteriorate in Alzheimer’s disease [7]. BDNF plays a similar role, acting like fertiliser for neurons, encouraging them to form new connections, survive stress, and communicate more efficiently [1].

The problem? NGF and BDNF are large molecules. They can’t simply cross the blood-brain barrier when you swallow them. Your brain has to be prompted to produce its own.

This is where lion’s mane becomes genuinely interesting. The mushroom contains two families of small bioactive compounds, hericenones (found in the fruiting body) and erinacines (found in the mycelium, the root-like structure). These molecules are small enough to cross the blood-brain barrier, and research suggests they can stimulate NGF and BDNF synthesis from the inside [3, 6, 7]. Rather than delivering growth factors directly, they appear to nudge your brain into producing more of its own.

That’s the mechanism researchers are working with. It’s elegant in theory. The question is how well it holds up in human trials, and that’s where things get more nuanced.

Key Finding 1: Neurite Outgrowth, Neurons Literally Growing New Branches

In a 2013 Malaysian study published in *the International Journal of Medicinal Mushrooms*, researchers tested aqueous (water-based) lion’s mane extract on NG108-15 cells, a neuroblastoma-glioma hybrid cell line used to model neural behaviour [7].

The result was striking: the combination of a low dose of NGF (10 ng/mL) with just 1 µg/mL of lion’s mane extract produced a 60.6% increase in neurite outgrowth compared to controls. Neurites are the projections neurons extend to form connections with other cells, the physical architecture of neural connectivity.

What’s notable here is the synergy. The mushroom extract wasn’t just triggering NGF-like activity on its own; it was amplifying the effect of existing NGF. The extract appeared to stimulate cells to secrete their own extracellular NGF, which then drove the neurite growth [7].

Evidence grade: Early stage. This is a cell study, not a human trial. Growing neurons in a dish respond very differently to interventions than neurons inside a living brain, embedded in tissue, surrounded by immune cells and blood vessels. This finding is mechanistically interesting and directionally encouraging, but it tells us what *might* happen, not what *does* happen in people.

Key Finding 2: Lion’s Mane Appears to Promote Neuronal Differentiation

A 2025 study published in *Biomedicine & Pharmacotherapy* took this further, looking at what happens when lion’s mane extract is applied to SH-SY5Y cells, a human neuroblastoma line widely used in neuroscience research [2].

The extract prompted these cells to differentiate, essentially, to mature from relatively undifferentiated tumour-like cells into something resembling functioning neurons. The researchers observed:

– Upregulation of βIII-tubulin and synaptotagmin, proteins associated with mature, functional neurons – Increased neuronal excitability, meaning the cells were firing more like real neurons – Reduced PCNA, a marker of cell proliferation, suggesting the cells had shifted from a growth mode to a mature, stable state [2]

The researchers also noted a decrease in stemness markers, indicating a shift toward a more committed neuronal identity.

Evidence grade: Early stage. Again, this is cell-based research. The SH-SY5Y line is a useful model but it is still a cancer cell line, not primary neurons. These findings provide important mechanistic evidence for how lion’s mane might support neuronal health at a molecular level, but human brain tissue is incomparably more complex.

Key Finding 3: Erinacines Cross the Blood-Brain Barrier, and That Changes Everything

One of the most important details in the lion’s mane story is where the action happens. A 2025 review in *Frontiers in Pharmacology* specifically examined the neuroprotective role of erinacines, the compounds found in lion’s mane mycelium [3].

The critical finding: erinacines have been shown to cross the blood-brain barrier, meaning they can reach the brain directly rather than acting only in the gut or bloodstream. This is what makes them mechanistically plausible as a genuine brain intervention, rather than just another compound that looks good in a test tube but never makes it to where it matters [3, 13].

Research has linked erinacines to reduced neuroinflammation, protection against neurodegenerative processes, and support for cognitive function [3]. A separate animal study confirmed that erinacine A-enriched mycelium can modulate the BDNF/TrkB/PI3K/Akt/GSK-3β pathway, a signalling cascade that influences both mood and neuronal survival [13].

Evidence grade: Promising for the mechanism, early stage for clinical outcomes. The blood-brain barrier crossing is established. The downstream effects in living human brains remain an area where more rigorous human trials are needed.

Key Finding 4: A Human Cognitive Trial Showed Real-World Results

Here’s where the story becomes more clinically grounded. A 2019 randomised, double-blind, placebo-controlled trial published in *Biomedical Research* tested lion’s mane supplementation on cognitive function in humans [14].

Participants (aged 50 and above) took supplements containing lion’s mane fruiting body for 12 weeks. Cognitive function was assessed using three tests: the Mini Mental State Examination (MMSE), the Benton Visual Retention Test, and the Standard Verbal Paired-Associate Learning Test.

The MMSE, a widely used, validated cognitive screening tool, showed that lion’s mane intake significantly improved cognitive function and prevented deterioration compared to placebo [14].

The researchers speculated that the hericenones and other compounds in the fruiting body were having “multiple effects on brain neural networks”, language that aligns with the connectivity angle this research explores.

Evidence grade: Promising. This is a proper randomised controlled trial in humans, which puts it several steps above the cell studies. However, the sample size was small and the duration was 12 weeks. We’d want to see larger trials with longer follow-up before drawing firm conclusions. The direction of the evidence is encouraging.

Key Finding 5: The Gut-Brain Axis, An Unexpected Route to Neural Effects

A fascinating 2025 study in the *Journal of Ethnopharmacology* added a dimension that many people don’t consider when they think about brain supplements: the gut [1].

Researchers used a sophisticated simulator of the human gut microbiome (called SHIME, Simulator of the Human Intestinal Microbial Ecosystem) to model what happens to lion’s mane compounds after digestion and fermentation by gut bacteria. The resulting microbiome metabolites were then applied to human cells.

The findings showed that these gut-processed metabolites:

– Upregulated BDNF, CDNF, and MANF, all neurotrophic factors critical for neuronal survival and function – Activated the CREB/BDNF signalling pathway, a cascade strongly associated with memory formation, synaptic plasticity, and mood regulation – Influenced the Nrf2 pathway and activated heat shock proteins, which may have neuroprotective effects [1]

What this suggests is that lion’s mane may not only act directly, it may be partially processed by your gut microbiome into metabolites that then signal upstream to the brain via the gut-brain axis. This is a genuinely novel finding and adds biological plausibility to the mood and cognition effects seen in human studies.

Evidence grade: Early stage, but mechanistically compelling. The SHIME system is a validated model, but it is not a living human digestive system. The cell findings are promising, but this work is pilot-level and the researchers themselves describe it as such.

Key Finding 6: Four Weeks of Lion’s Mane Reduced Anxiety and Depression Scores

A 2010 double-blind, placebo-controlled trial published in *Biomedical Research*, one of the earliest human trials on lion’s mane, tested its effects on mood, sleep, and anxiety in 30 women going through menopause [10].

After just four weeks of consuming lion’s mane cookies (yes, cookies), participants in the active group showed:

– Significantly lower scores on the Centre for Epidemiologic Studies Depression Scale (CES-D) – Significantly lower Indefinite Complaints Index (ICI) scores – Particular reductions in feelings of being “insensitive” and experiencing palpitations – Trends toward improvement in concentration, irritability, and anxiety [10]

The researchers noted these mood effects appeared to operate through a different mechanism from NGF enhancement, suggesting lion’s mane may have mood pathways that are independent of its neurotrophic effects.

Evidence grade: Promising, with important caveats. N=30 is small. The population was specifically menopausal women, so we can’t automatically extrapolate to other groups. And “lion’s mane cookies” is not a standardised supplement dose. But the direction of the findings, reduced anxiety and depression scores in a controlled human trial, is worth noting seriously.

Key Finding 7: One Trial Found No Acute Effect, Honesty Matters Here

In 2025, a rigorous randomised, placebo-controlled, double-blinded, crossover study published in *Frontiers in Nutrition* tested the acute (single-dose) effects of a standardised lion’s mane extract on cognition and mood [5].

The result? No significant effect. A single dose did not improve cognitive performance or mood in healthy adults compared to placebo.

This finding is important and shouldn’t be brushed aside. It tells us something meaningful: if lion’s mane works, it probably doesn’t work immediately. The mechanisms proposed, NGF synthesis, neurite outgrowth, BDNF upregulation, are all slow biological processes. You don’t rebuild neural connectivity in an afternoon. The four-week mood trial [10] and the 12-week cognitive trial [14] both used sustained daily dosing, and those are the ones showing signal.

Evidence grade: Strong for what it tells us, single doses don’t work. This study is a useful reminder that lion’s mane, if effective, is a long-game intervention, not a quick hit.

What We Don’t Know Yet

Let’s be straightforward about the gaps, because they matter.

Most of the mechanistic research is in cells or animals. The neurite outgrowth findings [7], the neuronal differentiation data [2], the blood-brain barrier work [3], and the anxiety-sleep studies [13], these are largely lab bench and rodent research. The leap from “works in a mouse” or “works in a cell dish” to “works in a middle-aged human brain” is substantial and not guaranteed.

Human trials are small and short. The best human RCT data we have involves 30 participants over four weeks [10] and a small group over 12 weeks [14]. We don’t yet know what happens with larger populations, longer durations, or more diverse age groups.

Dosing is inconsistent and poorly standardised. Different studies use fruiting body vs. mycelium, different extraction methods, different doses, and different delivery formats (including, memorably, cookies [10]). Erinacines are primarily in the mycelium, hericenones in the fruiting body, they may have different effects. Which preparation is optimal for cognitive benefit in humans is genuinely unknown.

The acute dose study showed no effect [5]. This is a flag that expectation management is important. Lion’s mane is not a nootropic you’ll feel on day one.

The scan data referenced in research discussions remains largely theoretical or animal-derived. No large-scale human neuroimaging studies (fMRI, MRI connectivity scans) of lion’s mane effects in healthy adults currently exist in this literature. The “what the scans show” story is, right now, a story still being written.

Research hypothesis papers are not trials. Paper [4] is a proposed research hypothesis, not a completed study. It should not be taken as evidence of efficacy. We’ve noted it only for completeness in mapping the research landscape.

The Final Takeaway

Here’s how a sensible, well-informed person should think about lion’s mane in 2025.

The mechanistic case is genuinely interesting and increasingly well-supported: these mushrooms contain small molecules that can reach your brain, appear to stimulate neurotrophic factor production, and have demonstrated measurable effects on neuronal growth and differentiation in lab models. That’s not nothing, that’s a credible biological story [3, 6, 7].

The human trial data is limited but directionally positive. A 12-week RCT showed improved cognitive scores [14]. A four-week trial showed reduced anxiety and depression [10]. A gut-brain axis study showed upregulation of BDNF signalling pathways following microbiome processing of lion’s mane compounds [1]. None of these studies are definitive, but they all point in the same direction.

What we can say with confidence is this: lion’s mane is not a quick fix, and a single dose will do nothing [5]. If you’re going to try it, commit to at least eight to twelve weeks of consistent daily use, using a product that specifies whether it contains fruiting body, mycelium, or both, and ideally standardised for hericenone or erinacine content.

The safety profile across the studies reviewed is reassuring, no significant adverse effects were reported in any human trial, and it has been consumed as food in Asian countries for centuries [6].

Should you try it? If you’re in the 40-65 age group thinking seriously about maintaining cognitive health and resilience, lion’s mane sits in the “worth considering” category, not the “proven” category, but not the “ignore it” category either. It’s a low-risk supplement with a plausible mechanism, some promising human data, and a reasonable body of early-stage science behind it. The absence of proof is not proof of absence, and the trials we do have lean positive.

The bigger picture: the research on lion’s mane and neural connectivity is still being written. The mechanisms are credible. The human data is emerging. Watch this space, and in the meantime, think of lion’s mane as a long-term investment in the maintenance of your neural infrastructure, not a shortcut to overnight brilliance.

References

[1] Biotransformation of *Ganoderma lucidum* and *Hericium erinaceus* for ex vivo gut-brain axis modulation and mood-related outcomes in humans: CREB/BDNF signaling and microbiota-driven synergies (2025). *Journal of Ethnopharmacology*. DOI: 10.1016/j.jep.2025.119393 | https://pubmed.ncbi.nlm.nih.gov/39848413/

[2] *Hericium erinaceus* extracts promote neuronal differentiation and excitability through nootropic metabolite activity (2025). *Biomedicine & Pharmacotherapy*. DOI: 10.1016/j.biopha.2025.118204 | https://pubmed.ncbi.nlm.nih.gov/40413998/

[3] Unveiling the role of erinacines in the neuroprotective effects of *Hericium erinaceus* (2025). *Frontiers in Pharmacology*. DOI: 10.3389/fphar.2025.1582081 | https://pubmed.ncbi.nlm.nih.gov/40626304/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12230622/

[4] Research hypothesis: Mitigating neurological and neuropsychological symptoms associated with Alzheimer’s disease using *Psilocybe cubensis* and *Hericium erinaceus* (2025). *Alzheimer’s & Dementia*. DOI: 10.1002/alz70856_097076 | https://pubmed.ncbi.nlm.nih.gov/41442078/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12731483/

[5] Acute effects of a standardised extract of *Hericium erinaceus* on cognition and mood (2025). *Frontiers in Nutrition*. DOI: 10.3389/fnut.2025.1405796 | https://pubmed.ncbi.nlm.nih.gov/40276537/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12018234/

[6] Chemistry, Nutrition, and Health-Promoting Properties of *Hericium erinaceus* (Lion’s Mane) Mushroom Fruiting Bodies and Mycelia and Their Bioactive Compounds (2015). *Journal of Agricultural and Food Chemistry*. https://pubmed.ncbi.nlm.nih.gov/26244378/

[7] Neurotrophic properties of the Lion’s Mane medicinal mushroom, *Hericium erinaceus* (Higher Basidiomycetes) from Malaysia (2013). *International Journal of Medicinal Mushrooms*. https://pubmed.ncbi.nlm.nih.gov/24266378/

[10] Reduction of depression and anxiety by 4 weeks *Hericium erinaceus* intake (2010). *Biomedical Research*. https://pubmed.ncbi.nlm.nih.gov/20834180/

[13] *Hericium erinaceus* mycelium ameliorates anxiety induced by continuous sleep disturbance in vivo. *BMC Complementary Medicine and Therapies*. DOI: 10.1186/s12906-021-03463-3 | https://pubmed.ncbi.nlm.nih.gov/34865649/ | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8643634/

[14] Improvement of cognitive functions by oral intake of *Hericium erinaceus* (2019). *Biomedical Research*. DOI: 10.2220/biomedres.40.125 | https://pubmed.ncbi.nlm.nih.gov/31413233/

[15] ALSUntangled #73: Lion’s Mane (2024). *Amyotrophic Lateral Sclerosis and Frontotemporal Degeneration*. DOI: 10.1080/21678421.2023.2296557 | https://pubmed.ncbi.nlm.nih.gov/38141002/

This article is for informational purposes only and does not constitute medical advice. Food supplements should not be used as a substitute for a varied and balanced diet and healthy lifestyle. If you are pregnant, breastfeeding, taking medication or have a medical condition, consult your doctor before taking any supplement. These statements have not been evaluated by the Food and Drug Administration (FDA) or the Medicines and Healthcare products Regulatory Agency (MHRA). This product is not intended to diagnose, treat, cure, or prevent any disease.