Lion's Mane and "Nerve Growth Factor" Claims: Laboratory vs Human Evidence
Lion's mane is often said to boost nerve growth factor and repair nerves. This page separates cell and animal findings from what human trials have measured.
Content last updated . This page has not been medically reviewed.
Safety first. Supplements can cause side effects and interact with medicines. Read mushroom safety and interactions before you use any mushroom product.
The claim
Labels and websites often say lion's mane "boosts nerve growth factor (NGF)" or "regrows nerves". NGF is a natural protein that helps nerve cells survive and grow. The claim comes mostly from laboratory work on Hericium erinaceus (Bull.) Pers. Evidence label for use in people: insufficient evidence. For cell and animal findings: preclinical (cells or animals).
What the laboratory work found
| Question | What the source found | Strength of evidence |
|---|---|---|
| Does an extract raise NGF in human cells? | Alcohol extracts of lion's mane raised NGF gene activity in human astrocytoma (a brain-tumor cell line) cells, and three other edible mushroom extracts did not.[1] | Preclinical (cells) |
| Is it the hericenones? | In that study, hericenones C, D and E failed to promote NGF gene expression in those cells, and the authors concluded the active compounds "are not hericenones".[1] | Preclinical (cells) |
| Does it work in a living animal? | Mice fed 5% lion's mane powder for 7 days showed more NGF messenger RNA in the hippocampus, a memory-related brain region.[1] | Preclinical (mice) |
| Does erinacine A reach the brain? | In rats, erinacine A from mycelium extract reached the brain by passive diffusion, with absolute bioavailability of about 24%.[2] In pigs given erinacine A by injection, it was found in cerebrospinal fluid.[3] | Preclinical (animals) |
| Does it help animals' cognition and behavior? | A systematic review of cell and rodent studies found dose-dependent benefits in motor, cognitive and depression-like behaviors, mostly from mycelial formulations and erinacines.[4] | Preclinical (animals) |
| Does it help repair injured nerves? | A systematic review of mushrooms for peripheral nerve injury found animal and cell evidence for lion's mane and said clinical research is still needed.[5] | Preclinical (animals) |
These results are about extracts, isolated compounds or injections, not a capsule, powder or coffee a person swallows. Hericenones and erinacines explains the two compound groups.
What human studies have measured
- NGF itself: Proper evidence not found. We searched PubMed for human trials of Hericium erinaceus with NGF and BDNF; none of the trial abstracts we read reports a measured NGF level.
- BDNF (a related protein): In 77 adults with overweight or obesity, pro-BDNF rose after 8 weeks while BDNF did not change.[6] In 10 healthy adults taking it for 28 days, plasma BDNF did not change significantly.[7] In a pilot trial in mild Alzheimer's disease, some biomarkers fell in the placebo group only, including BDNF.[8]
- Memory and mood scores: small trials with mixed results; see memory and cognition and anxiety, low mood and stress.
- A trial's authors suggested a different mechanism: one human mood trial said its results suggest a mechanism different from NGF enhancement.[9]
A blood marker moving is not the same as a nerve repairing, or a person functioning better.
Limits
- Cell and animal doses and routes (injection, concentrated extracts, mycelium grown for research) are not the same as supplements.
- A review of the clinical work noted that only a limited number of trials exist.[10]
- No source we read shows that lion's mane repairs damaged nerves in people. If you have numbness, weakness, a nerve injury or a neurological condition, see a clinician.
Related
Frequently asked questions
Does lion's mane increase nerve growth factor in humans?
Proper evidence not found. NGF increases were shown in cells and mice,[1] but the human trials we read measured BDNF at most.[6][7]
Can lion's mane regrow or repair nerves?
Animal studies suggest possible nerve-repair effects, and a review says clinical research is needed.[5]
Are hericenones the active compounds?
Not necessarily. In one cell study the hericenones tested did not raise NGF activity.[1]
Does erinacine A reach the brain?
In rats it did,[2] and in pigs given it by injection it reached cerebrospinal fluid.[3] No equivalent finding for people was in the sources we read.
Is "neurogenesis" proven in people?
No. Neurogenesis claims are based on preclinical work.[4]
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Safety
The same cautions apply as for other lion's mane products: stomach upset, rare allergic reactions, and checking medicines with a pharmacist. See side effects and allergy and how interactions work. Check products using quality testing guidance. A clinician decides what is right for a person.