Lion's Mane and Your Brain: What the Research Actually Says

Most articles about Lion's Mane and focus tell you about the promising study and stop there. There's a second one, more recent, that found something more complicated — including a result that got worse, not better. That's the more honest and, frankly, more interesting version of this story, so it's the one told here in full.

What Lion's Mane actually is

Lion's Mane (Hericium erinaceus) is a shaggy, white mushroom known in Chinese as Hóu tóu gū — "monkey head mushroom," for its shaggy appearance. It's been used as both food and medicine in Chinese tradition for a long time, prepared as a tea, a tonic, or cooked into dishes, and traditionally associated with supporting several organ systems and general vitality rather than one specific complaint. In the last decade it's become the most-researched functional mushroom specifically in relation to cognition and the nervous system, which is exactly why it's the ingredient most associated with "focus" across this entire category — and why it's worth getting the actual research right, rather than repeating the same three sentences every other brand uses.

What NGF actually is, and what Lion's Mane may do to it

Nerve Growth Factor (NGF) is a protein your body already produces. It plays a role in the growth, maintenance and survival of certain nerve cells — it's not something Lion's Mane introduces to you, it's something your body already makes, and the scientific interest is in whether Lion's Mane can influence how much of it gets produced.

Lion's Mane contains two groups of compounds — hericenones (found in the fruiting body) and erinacines (found mainly in the mycelium) — that laboratory and animal research suggests may help stimulate NGF synthesis. That's genuinely interesting mechanistic groundwork. It's also, as of today, evidence drawn mostly from lab and animal models rather than confirmed human data — a meaningfully different, and earlier, category of evidence than a human clinical trial.

What the actual human studies found — including the part most articles skip

Two studies are worth walking through properly, because taken together they tell a more honest story than either one alone.

The first, published in Frontiers in Nutrition in 2025, was a double-blind, placebo-controlled crossover trial in 18 healthy adults aged 18–35. Each participant took a single 3-gram dose of a concentrated (10:1) Lion's Mane fruiting body extract — roughly equivalent to 30 grams of fresh mushroom — and was tested 90 minutes later. The overall composite measure of cognitive function showed no significant improvement. Broken down by individual task, the results were genuinely mixed: performance improved on a psychomotor dexterity test (the pegboard test, for both hands), but performance on two executive-function tests — the Flanker task and Trail-Making Test B — was worse with Lion's Mane than with placebo. No effect on mood was detected. With only 18 participants and a single acute dose, this isn't a study anyone should draw firm conclusions from in either direction — but it's a genuinely different picture from "Lion's Mane improves focus," and it deserves to be told accurately rather than quietly left out.

The second, a larger trial posted to medRxiv in 2026 and not yet peer-reviewed, looked at 109 adults aged 40–75 who reported their own cognitive concerns (not a clinical diagnosis). Participants took 2 grams daily of a combined Lion's Mane fruiting body and mycelial biomass extract for eight weeks, after a one-week baseline period. This trial found statistically significant improvements in visual attention and working memory, along with better subjective sleep quality, morning restedness, and overall mood — described by the researchers themselves as "modest" on the cognitive measures, with the sleep and mood improvements showing up faster. Worth knowing plainly: this study was funded by a supplement ingredient manufacturer (though the funder reportedly had no role in the analysis), it hasn't yet been through peer review, and its participants were a specifically older group with self-reported concerns — not a general healthy adult population.

So what does that actually add up to?

Two small-to-moderate studies, different populations, different doses, different forms (a pure fruiting-body extract in one, a fruiting-body-plus-mycelium blend in the other), different durations, and meaningfully different — sometimes contradictory — results on cognitive measures specifically. That's not a reason to dismiss Lion's Mane; it's a reason to describe the evidence honestly as early and still being worked out, which is precisely the phrase that actually applies here, rather than the vaguer "promising research" language used almost everywhere else in this category. The one place both studies agree is on the absence of any downside signal — neither reported adverse effects attributable to Lion's Mane.

None of this is a reason to expect a fast or dramatic result. Neither study tested or claims to have found an instant effect, and the eight-week duration of the second study describes that trial's design, not a promise about how long anyone should expect to wait for a particular outcome — that's not how this evidence works, and it's not how QiMycology talks about it.

What this doesn't mean

It doesn't mean Lion's Mane measurably raises your NGF levels day to day — that link is still based mainly on lab and animal research. It doesn't mean an instant, noticeable cognitive shift; nothing in either human study suggests a fast-acting mechanism, and one of them found certain measures got worse, not better, in the short term. And it doesn't mean it will fix a focus problem that actually has a different cause entirely — poor sleep, constant notifications, or a task that's just genuinely tedious (all covered in more detail elsewhere on this site).

The honest summary

Lion's Mane is one of the more scientifically interesting ingredients in the functional mushroom category — genuinely researched, genuinely mixed in its early human results, and genuinely worth being curious about without expecting it to behave like a stimulant. QiMycology's Adaptogen Blend uses Lion's Mane extract (1200mg per serving) alongside Astragalus, Schisandra and Rhodiola. Our supplier has confirmed our Lion's Mane extract comes from the fruiting body. We'd rather explain the research honestly than round it up.

Curious what else is in the Adaptogen Blend, and why each ingredient earned its place alongside Lion's Mane? The full breakdown is on the product page.

Sources used for this article:

• Acute effects of a standardised extract of Hericium erinaceus (Lion's Mane mushroom) on cognition and mood in healthy younger adults — Frontiers in Nutrition, 2025.
• A randomized, double-blind, placebo-controlled study evaluating the impact of Hericium erinaceus (Lion's Mane) on cognitive performance and subjective wellbeing — medRxiv preprint, 2026.