Evidence sheet · 22 October 2026
Lion's mane (Hericium erinaceus) — research overview
THE FOCUX · 22 October 2026 · PMIDs/DOIs checked in PubMed.
Framing: the fruiting body is an edible mushroom. Lion's mane mycelium and isolated erinacine A are not authorised as novel foods in the EU. This sheet explains the research; it is not a product recommendation.
1. What it is
An edible mushroom (yamabushitake). Two parts are distinguished: (a) the fruiting body (the mushroom that is eaten; contains hericenones and polysaccharides); (b) cultivated mycelium (source of erinacines, e.g. erinacine A). Many supplements mix mycelium with its cereal growing substrate.
2. EU status
- Fruiting body: not a novel food (history of consumption); it can be sold as a food under general food law.
- Mycelium and erinacine A (isolated or mycelium enriched in erinacine A): there is no entry for Hericium erinaceus in the EU Union list of novel foods, so they are not authorised.
3. Authorised EU health claims
None. (Botanical claims are "on hold" in the EU and cannot be presented as authorised.)
4. What has been studied
All cognitive and mood results are described neutrally: they are not an authorised claim in the EU.
| Study | PMID / DOI | Population | n | Product | Duration | Result |
|---|---|---|---|---|---|---|
| Mori 2009, Phytother Res (RCT) — not an authorised claim in the EU | 18844328 / 10.1002/ptr.2634 | Japanese adults aged 50-80 with mild cognitive impairment | 30 (15 vs 15) | Tablets made mostly of dried fruiting-body powder | 16 weeks (+4 follow-up) | Better cognitive scale score vs placebo; the difference disappeared 4 weeks after stopping |
| Li IC 2020, Front Aging Neurosci (pilot RCT) — not an authorised claim in the EU | 32581767 / 10.3389/fnagi.2020.00155 | Patients with mild Alzheimer's disease | not reported in the abstract | Erinacine A-enriched mycelium (form not authorised in the EU) | 49 weeks | Differences on some scales (CASI, MMSE, IADL) vs placebo; 4 dropouts due to abdominal discomfort, nausea or rash |
| Docherty 2023, Nutrients (pilot RCT) — not an authorised claim in the EU | 38004235 / 10.3390/nu15224842 | Healthy adults aged 18-45 | 41 | Lion's mane (part of the mushroom not stated in the abstract) | Single dose and 28 days | Faster on one task (Stroop) at 60 min; non-significant trend on stress (p=0.051); the authors report null and some negative results |
| Surendran 2025, Front Nutr (crossover RCT) — not an authorised claim in the EU | 40276537 / 10.3389/fnut.2025.1405796 | Healthy adults aged 18-35 | 18 | Fruiting-body extract, single dose | Acute (90 min) | No effect on global measures of cognition and mood; only one isolated test (pegboard) |
| Evans 2026, Nutrients (uncontrolled pilot) — not an authorised claim in the EU | 42884628 / 10.3390/nu18193177 | Healthy adults aged 18-55 | 10 | Mycelium biomass + fruiting body | 28 days | No significant changes in executive function or plasma BDNF; no placebo group |
| Menon 2025, Front Nutr (systematic review) | 40959699 / 10.3389/fnut.2025.1641246 | 5 RCTs, 3 pilots and laboratory studies | — | Various | — | Mixes scarce human evidence with abundant in vitro/animal evidence; describes stomach upset, headache and allergies as possible effects |
5. Evidence against and limitations
- Few human trials, all small (n=10-41) and with very different products (fruiting body, mycelium, extracts), which prevents generalisation.
- Null or near-null results in healthy adults (PMID 40276537, 42884628; mixed results in 38004235).
- The effect in the 2009 trial disappeared after stopping (PMID 18844328).
- The erinacine A trial (PMID 32581767) used mycelium not authorised in the EU and is a pilot.
- Research on erinacines and nerve growth factor is almost entirely in animals and cells (e.g. PMID 27350344, DOI 10.1186/s12929-016-0266-z, transgenic mice).
- The 2025 review (PMID 40959699) draws broad conclusions from preclinical studies; it is not proof of efficacy in humans.
6. Safety and warnings
- Reported effects: stomach upset, nausea, rash/allergy (PMID 32581767, 40959699).
- Pregnancy, breastfeeding and minors: no safety data, so not addressed to these groups.
- For fruiting-body products sold as food supplements:
Mandatory label information for food supplements (EU Directive 2002/46/EC; in Spain, Royal Decree 1487/2009, art. 5.5): the label must include the recommended daily portion, a warning not to exceed the stated recommended daily dose, a statement that food supplements should not be used as a substitute for a varied diet, and a statement that the product should be stored out of the reach of young children.
Educational information, not medical advice. Food supplements should not replace a varied and balanced diet and a healthy lifestyle. Talk to a health professional before taking supplements, especially if you are pregnant, breastfeeding or take medication.
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