Lion's mane is an edible mushroom sold for memory and focus.
Calculator Official intake Study doses Best form Safety Sources
This is not an essential nutrient, so there is no official daily intake. Only study doses are shown.
These are doses tested in research, not personal advice. Some exceed the upper limit because they were short courses or given under medical care.
3 g a day
In 30 older adults with mild cognitive impairment, 3 g dried mushroom powder a day for 16 weeks improved thinking scores against placebo. Scores fell again 4 weeks after stopping. One small trial.
No best form
Why: The trial used powdered fruiting body. Many products use mycelium grown on grain, which is not the same.
Eaten as a mushroom in East Asian cooking.
No well-documented interactions.
Well tolerated in the trial; avoid with mushroom allergy.
Pregnant, breastfeeding, on medication, or managing a health condition? Check with a doctor or pharmacist before starting a supplement.
Values checked: November 12, 2026.