Can Lion’s Mane Mushrooms Really Boost Brainpower? A Pilot Study Reveals Surprising Results

A 28-day trial found Lion’s Mane mushrooms may temporarily boost cognitive speed—but only in the first week. The effect vanished by day 28, and stress reduction was near-significant, leaving scientists puzzled. Here’s what the data actually shows.

A 28-day trial found Lion’s Mane mushrooms may temporarily boost cognitive speed—but only in the first week. The effect vanished by day 28, and stress reduction was near-significant, leaving scientists puzzled. Here’s what the data actually shows.

In a small study of 41 healthy adults, those who took 1.8 grams of Lion’s Mane daily saw faster reaction times on a cognitive test after a single dose—but not by day 28. The improvement, measured on the Stroop task (a test of attention and flexibility), had a p-value of 0.005, yet disappeared by the end of the trial. Stress reduction trends were close to significant (p = 0.051), but not enough to confirm a pattern. The results contrast with earlier work in older adults with cognitive decline, but this trial’s focus on young, healthy participants limits its reach.

Lion’s Mane contains erinacines, compounds that may stimulate nerve growth factor (NGF), which supports neurons. Animal studies suggest NGF could repair brain tissue, but in this trial, the mushroom didn’t alter brain structure. The temporary speed boost might stem from fleeting NGF spikes or other neurotransmitter changes—but the mechanism remains unclear.

A 2024 review noted that while epidemiological data links mushroom consumption to better cognition in older adults, clinical trials are inconsistent. Lion’s Mane shows “some enhancement of mood and cognitive function” in middle-aged and older populations, but not in younger, healthier groups.

The study’s most intriguing takeaway is the questions it raises. If a single dose of Lion’s Mane can temporarily improve cognitive speed, what does that say about the brain’s responsiveness to natural compounds? Could this hint at how diet influences neural plasticity?

But the effects were modest. Stress reduction wasn’t statistically significant. The authors caution the findings are “tentative,” noting the small sample size and short duration. The mushroom didn’t improve memory, focus, or mood beyond a vague stress reduction.

Lion’s Mane isn’t alone in the “mushroom for the mind” niche. A 2023 review listed 21 nutrients with potential cognitive benefits, including omega-3s and B vitamins—each with decades of research behind them. The challenge for Lion’s Mane, and for functional mushrooms, lies in proving consistent, dose-dependent effects. A 2025 systematic review notes it shows “promising properties,” but its safety profile and long-term efficacy remain untested.

• No cure for cognitive decline: The study tested healthy adults, not those with dementia or brain injuries.
• No long-term benefits: The 28-day intervention didn’t show sustained cognitive or mood improvements.
• No mechanism confirmed: The acute effect on the Stroop task may be due to factors unrelated to NGF.
• No universal effectiveness: Results were mixed, with some participants showing no change.

Q: Is Lion’s Mane safe to take daily?
A: The study didn’t report serious side effects, but long-term safety data remains limited. A 2025 review notes it’s generally well-tolerated, but more research is needed.

Q: How does it compare to other brain supplements?
A: It’s still in early stages. Omega-3s and B vitamins have stronger evidence for cognitive support, though Lion’s Mane’s unique compounds may offer complementary benefits.

Q: Who might benefit from it?
A: The study’s small sample size makes it hard to say. Some users report mood improvements, but the evidence is anecdotal.

Q: What’s next for mushroom research?
A: Larger, longer trials are needed—especially in diverse populations. Researchers are also exploring how different mushroom species interact with the gut-brain axis.

Sources
– 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
– The effects of twenty-one nutrients and phytonutrients on cognitive function: A narrative review
– A review of the effects of mushrooms on mood and neurocognitive health across the lifespan
– Benefits, side effects, and uses of Hericium erinaceus as a supplement: a systematic review

Educational Disclaimer

This article is for informational and educational purposes only. It is not medical advice, mental health advice, diagnosis, treatment guidance, or a recommendation to use any substance, supplement, therapy, or protocol.

We review publicly available research and explain what the evidence may suggest. Some studies may be early-stage, observational, animal-based, lab-based, theoretical, or incomplete. Always consult a qualified professional before making health-related decisions.

Researched and drafted by Spore, ShroomWire’s AI research assistant, and reviewed by the ShroomWire editorial team before publishing.