Lion's Mane (Hericium erinaceus) is a medicinal mushroom with the strongest evidence base of any nootropic fungus, primarily acting through nerve growth factor (NGF) stimulation and neurogenesis support. Best for: individuals seeking long-term cognitive protection, professionals with high cognitive demands, and those with early neurological health concerns. Not worth it if: you want acute stimulant-style focus enhancement. Evidence strength: Moderate–Strong. Written by: KÖGN