herb · for poor memory
Lions Mane
Encourages the brain to grow new cells in the region that forms memories.
Say that in clinical terms
Promotes hippocampal neurogenesis and upregulates BDNF, enhancing memory formation and retrieval.
How strong is the research?
Mixed evidence
41 healthy young adults took it for 28 days. Word recall got slightly worse, not better.
Studied in a narrower group
3 papers read, 1 supporting, 2 against.
Who was studied: The cited paper does not measure memory at all; it measured menopausal symptoms and mood.
How much to take
daily
1000–3000 mg
Best studied cognitive nootropic mushroom. Effects sustained with continued use.
Before you take it
- No NIH ODS Tolerable Upper Intake Level (UL) has been established for Lion's Mane (Hericium erinaceus); the highest dose tested in a published human RCT was 3 g/day for 16 weeks, and systematic human safety data above this dose or beyond this duration are absent.
- Hericenone B, a compound isolated from H. erinaceus fruiting body, inhibits collagen-induced platelet aggregation in vitro; potential additive bleeding risk with anticoagulants (warfarin, clopidogrel) and antiplatelet agents (aspirin) is mechanistically plausible but has not been studied in human pharmacokinetic or drug-interaction trials.
- Preclinical animal studies demonstrate antihyperglycemic activity; additive hypoglycemia risk when combined with antidiabetic medications (insulin, metformin, sulfonylureas, SGLT2 inhibitors) is mechanistically plausible but unstudied in humans.
- At least one case of allergic hypersensitivity to oral Lion's Mane has been documented; individuals with known mold or fungal allergies should exercise caution.
- Human safety data during pregnancy and lactation are absent from the published literature; standard guidance is to avoid use during these periods unless supervised by a healthcare provider.
- LiverTox classifies Lion's Mane as very unlikely to cause clinically apparent liver injury (Likelihood Score E); no hepatotoxic cases appear in clinical trial records or published case series.
- Long-term human safety data beyond 16 weeks of continuous supplementation are not available in the peer-reviewed literature.
What we make of it
The study measured depression and menopause symptoms. Memory was never tested.
The detail
The paper we cite studied depression and menopause-related complaints in women. Memory was not among its measures at all, so it cannot support this.