Lion's Mane Research Roundup: What the 2025 Studies Actually Show

Lion's Mane has become one of the most hyped ingredients in functional food, and the research behind it is more interesting — and more mixed — than most product pages let on. Instead of cherry-picking the studies that make the best marketing copy, here's an honest roundup of what the actual research currently shows, including a 2025 study that complicates the simple "Lion's Mane boosts your brain" narrative.

The 2025 University of Surrey Study

The most rigorous recent research on Lion's Mane is a 2025 randomized, double-blind, placebo-controlled, crossover study from the University of Surrey, published in Frontiers in Nutrition. Researchers tested whether a single acute dose affects cognition and mood in healthy younger adults.

• Design: 18 healthy adults aged 18–35 drank either 3g of a 10:1 Lion's Mane fruiting-body extract or a matched placebo, with a one-week washout between test days. Cognition and mood were tested at baseline and 90 minutes post-dose.
• Global cognition and mood: No significant effect of the extract versus placebo on overall composite measures.
• Dexterity (pegboard test): A significant improvement after Lion's Mane on both the dominant hand (p < 0.001) and non-dominant hand, with performance declining after the placebo.
• Cognitive flexibility (Flanker task): Performance was actually worse after Lion's Mane than after placebo — a result the study's own authors describe as contradicting the dexterity findings.
• Trail Making Test B: Declined from baseline after the extract.
• Mood (PANAS): No significant benefit; positive affect showed only a non-significant trend.

The researchers concluded the results were inconclusive overall, with any benefit possibly limited to specific motor tasks, and called for larger trials with multiple timepoints and chronic (not just single-dose) dosing. It's also worth noting for transparency: two of the study's authors are employed by a company that uses Lion's Mane in its own products, a conflict of interest the paper itself discloses.

Earlier Supportive Research

Before this more cautious 2025 data, two smaller trials generated much of the enthusiasm around Lion's Mane:

• A 2019 trial reported cognitive improvement in older adults with mild cognitive impairment after a period of supplementation — a different population and a longer dosing window than the 2025 acute study.
• A 2020 trial reported better sleep quality in people with sleep disorders.

Both of these are encouraging, but both are also small studies that haven't yet been replicated at scale — the same evidence-maturity issue that applies across most functional mushroom and adaptogen research.

What We Actually Know vs. What's Still Open

Here's the honest summary: Lion's Mane has a long history of traditional use, a research base that's actively growing, and some genuinely interesting early signals — particularly around nerve growth factor (NGF) support and specific motor-task performance. What it does not yet have is a large, definitive, chronic-dosing human trial that clearly demonstrates a global cognitive benefit. The 2025 Surrey study is valuable precisely because it's more rigorous than most of what came before it, and it still landed on "inconclusive."

Where This Leaves HUSTLE and CALM

We use Lion's Mane in both HUSTLE and CALM because we think the ingredient is worth including based on its traditional use and the directionally interesting (if not yet conclusive) research — not because we're willing to claim more certainty than the science currently supports. If you want the consumer-facing version of this conversation, see Lion's Mane for Brain Fog: Does It Actually Work?

Frequently Asked Questions

Does Lion's Mane definitely improve brain function?

Current research is mixed. Some studies show benefits on specific measures (like certain motor tasks or sleep quality in specific populations), while a rigorous 2025 study found no significant effect on global cognition after a single dose, and even found a decline on one measure.

How much Lion's Mane was used in the 2025 study?

A single 3g dose of a 10:1 fruiting-body extract, tested as an acute (one-time) effect rather than ongoing daily supplementation.

Why might results differ so much between studies?

Differences in dosage, extract type (fruiting body vs. mycelium), study population, acute vs. chronic dosing, and sample size all affect outcomes — which is part of why researchers keep calling for larger, more standardized trials.

Is Lion's Mane safe?

Lion's Mane is generally recognized as safe for most healthy adults as a food and supplement ingredient. As always, talk to a healthcare provider if you're pregnant, nursing, or managing a medical condition.

Curious how Lion's Mane fits into a full functional coffee ritual? Try HUSTLE.