Lion's Mane neurogenesis claims — separating real research from hype

The research is real but mostly preclinical. Lion's Mane contains hericenones (in the fruiting body) and erinacines (in the mycelium) that have been shown to stimulate NGF (Nerve Growth Factor) synthesis in vitro and in animal models. NGF supports neuronal growth and maintenance. Human trials are fewer and smaller. The best human evidence: a 2009 Japanese RCT (Mori et al.) with 30 mildly cognitively impaired adults showed significant improvements on cognitive testing with Lion's Mane vs. placebo. A 2019 study showed mood benefits. The evidence is promising but not yet conclusive for healthy adults.

The important distinction: fruiting body vs. mycelium products. Most of the neurogenic compounds (erinacines) are concentrated in the mycelium; hericenones are in the fruiting body. Many commercial supplements use mycelial biomass grown on grain — which may have high starch content from the grain and diluted active compound levels. Hot water extraction concentrates beta-glucans; dual extraction (hot water + alcohol) captures both beta-glucans and lipophilic compounds. Read the supplement's COA and extraction method before buying.

In the context of the Stamets microdosing stack: the combination of sub-threshold psilocybin + Lion's Mane + niacin is theorized to be synergistic for neuroplasticity. The scientific basis exists (both promote neural growth pathways), but the specific combination hasn't been studied in controlled trials. The synergy claim is plausible but not proven. Use it based on your own n=1 observations while understanding the evidence level.