Hericium erinaceus, mushroom fruiting body. A shaggy white edible mushroom used in traditional Chinese and Japanese medicine. Today it is the best-known “brain mushroom”, backed by strong lab science and a few small human trials.
What the research supports
- Memory in older adults: small trials (2009, 2019) found modest improvements in cognitive scores after 12 to 16 weeks, which faded after stopping.
- Focus in young adults: one 2023 trial found faster performance on one attention task after a single dose, but no clear benefit after 28 days.
- Mood: a small 2010 study reported less anxiety and depression after four weeks. Needs confirming.
- Nerve growth claims: strong in cells and animals, not yet proven in people.
The dose that was actually studied
About 1 to 3 g a day of dried fruiting body powder for 12 to 16 weeks in the memory trials. For liquid extracts, follow the label and start at the low end.
Who should not take it
- Anyone allergic to mushrooms or mold.
- People on diabetes medication or blood thinners, unless their doctor agrees.
- Pregnant or breastfeeding women, as there is no safety data.
Our take
A low-risk, reasonable experiment for memory and focus if you keep expectations modest. Read our full lion’s mane focus and memory guide for every study and the details.
Our pick
Hawaii Pharm Lion’s Mane Alcohol-Free Liquid Extract: Lion’s mane mushroom in an alcohol-free glycerite, easy to stir into coffee or tea.
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For general education only, not medical advice. Talk to your doctor or pharmacist before starting a supplement, especially if you take medication or are pregnant or breastfeeding.
