Hericium erinaceus · 5:1 dual-extract, fruiting body
A white, cascading mushroom that grows on hardwood. Its fruiting body contains compounds called hericenones and erinacines. Human research has investigated it mainly in older adults; we keep our own deep page on it for the detail.
Mori et al., 2009, Phytotherapy Research. 30 adults with mild cognitive impairment, 16 weeks, 3,000 mg. PMID 18844328
Note: trials are small and in impaired groups, and used a higher dose than ours. See the Lion's Mane deep dive.