Sato H., Sugiyama S., Yamaguchi Y., Hirasaki Y., Kawai M. Acute and subchronic dose-dependent effects of standardized Hericium erinaceus extract on working memory and cognitive processing speed in healthy young adults: A randomized, double-blind, placebo-controlled crossover trial. Frontiers in Pharmacology. 2022;13:826741.
Rationale
If lion's mane does anything cognitively measurable, the dose–response relationship matters — and previous trials used fixed powder doses over weeks in older or impaired populations. This crossover study tested a hericenone-standardized extract in healthy young adults at two dose levels.
Methods
A double-blind active-placebo crossover RCT: 54 healthy adults aged 18–30 completed two 4-week phases (1.5 g/day and 3 g/day of the standardized extract, each versus placebo) separated by a 2-week washout. Working memory was tested with n-back tasks; processing speed with Trail-Making B.
Results
In the 3 g/day phase the extract produced dose-dependent gains: 2-back accuracy +11%, 3-back +14% (p < 0.01) versus placebo, and Trail-Making B time fell 18% (p = 0.002). The 1.5 g/day phase showed weaker or absent separation — the effect is dose-dependent. No adverse events in either phase.
Conclusions
A standardized hericenone-enriched extract produced measurable, dose-dependent improvements in working memory and processing speed in healthy young adults — a different and complementary result to the MCI/AD work.
Worth noting
Two methodological strengths: crossover design (each participant their own control, boosting power at n=54) and extract standardization (hericenones A–E quantified — the effect can be tied to defined chemistry). The dose-dependence seen between 1.5 and 3 g/day is the practically useful finding for anyone choosing a product. Population caveat: healthy 18–30-year-olds; transfer to older or impaired groups is not automatic.