Podcast episode 125 (in German)
Lion’s mane – what the nerve mushroom really shows in humans
November 2, 2026
The package says nerve growth factor, and behind that stand 35 years of research on an edible mushroom. Whether any of it reaches the human brain has not yet been measured by anyone, and yet this is not an episode against the mushroom.
What it is about
Lion’s mane, Hericium erinaceus, is a white, shaggy edible mushroom that has been eaten in East Asia for centuries. In 1991 the hericenones were found in the fruiting body, 3 years later the erinacines in the mycelium; in cell culture they stimulate the production of nerve growth factor, a protein that keeps certain nerve cells alive. From there, the episode leads via mice and rats to the controlled studies in humans: small, partly backed by the manufacturer, with individual positive tests. Added to this is what users report, and in two directions: more concentration after a few weeks, but in some people emotional blunting. At the end stands a question nobody has seriously asked yet.
Key points
- In human cells, a mushroom extract raised the nerve factor in 2008, the pure hericenones did not; the authors write that the active substances are not the hericenones.
- Mice with mushroom powder in their feed had more messengers for the nerve factor in the memory center after one week, and erinacine A demonstrably reaches the brain in rats.
- In humans there are 8 small controlled studies, including a 2026 preprint, with fewer than 400 participants in total.
- In Japan in 2009, among 30 people aged 50 to 80 with mild cognitive impairment, the mushroom group was ahead from week 8 over 16 weeks; 4 weeks after stopping, the scores dropped markedly again.
- A 2020 study from Taiwan in mild Alzheimer’s dementia randomized 49 people for 49 weeks, 41 completed it; mycelium with erinacine A was tested, and 5 of 10 authors were paid by the manufacturer.
- In 41 healthy adults in the UK, a reaction test was faster one hour after a single dose; in 24 students in Alabama, mushroom in a muffin showed no effect.
- In the April 2026 preprint with 150 people aged 40 to 75, of whom 109 were analyzed, the mushroom group was better in one of several computer tests; sleep, feeling rested and mood improved faster.
Where the data stop
The mechanism is real, but not the advertised one: which molecule in the bowl acts is not established, and nobody has ever measured it in the human brain. The most meaningful studies and the preprint come from the manufacturers’ orbit; an independent replication is missing. That the effect wore off after stopping is normal for many products; what remains open is whether you get what you pay for. If the package only says extract, it remains unclear whether it contains fruiting body or mycelium.
The reports of better concentration fit with the gap in the Japanese study growing with duration; emotional blunting and reduced desire do not appear in the literature because nobody asked about them. Both are collected, not counted, and thus a question for the next study. In the studies there were abdominal complaints, nausea and once a skin rash; interactions have not been studied, and the longest study ran just under a year. Anyone with a mushroom allergy should avoid it; anyone who notices blunting should discuss it with a doctor.
Listen (in German)
Listen on Spotify Listen on Apple Podcasts Listen on Amazon Music
Published on November 2, 2026.
The topic in the database
- The “nerve mushroom” – NGF stimulation comes from cell experiments, not from humans.Lion's Mane
All episodes in the app (German)
Information only, not medical advice and not a usage or dosage recommendation. Prescription-only and unapproved substances belong in the hands of a physician. Last updated: 2026-10-09.