Lion's Mane Mushroom and Brain Health: Evidence Guide

What lion's mane is

Lion’s Mane (Hericium erinaceus) is an edible medicinal mushroom native to North America, Europe, and Asia, recognisable by its distinctive cascading white spines that resemble the mane of a lion. Used for centuries in traditional East Asian medicine as a tonic for the mind and nervous system, it has attracted significant scientific interest since the 1990s following the isolation of two classes of bioactive compounds — hericenones (found in the fruiting body) and erinacines (found in the mycelium) — that demonstrate the ability to stimulate Nerve Growth Factor (NGF) synthesis.

NGF is a protein essential for the growth, maintenance, proliferation, and survival of neurons. Its discovery by Rita Levi-Montalcini and Stanley Cohen earned the Nobel Prize in Physiology or Medicine in 1986. The finding that a dietary mushroom could stimulate NGF production positioned Lion’s Mane as one of the most scientifically interesting natural cognitive ingredients available.

Nerve growth factor mechanism

NGF operates through the TrkA and p75NTR receptor pathways in neurons, promoting neuronal survival, axonal growth, synaptic maintenance, and the survival of basal forebrain cholinergic neurons — the neurons most vulnerable in Alzheimer’s disease and most important for attention, memory, and learning. Low NGF levels are associated with neurodegeneration and cognitive decline; higher NGF availability supports the maintenance of the very neurons that cognitive performance depends on.

Hericenones and erinacines cross the blood-brain barrier and stimulate NGF mRNA expression in neurons directly, increasing the production and secretion of NGF protein in brain tissue. This mechanism is distinct from all other Memodyne ingredients and provides a form of cognitive support — neuronal maintenance and growth — that neither neurotransmitter-focused ingredients (Bacopa, Alpha GPC) nor vascular ingredients (Ginkgo) can replicate.

Neuroplasticity support

Neuroplasticity — the brain’s ability to form new neural connections, strengthen existing ones, and reorganise its structure in response to experience — is the biological basis of learning, memory consolidation, and the maintenance of cognitive function over time. NGF is a critical molecular signal in neuroplastic processes, particularly in the hippocampus and cortex where most executive function and memory formation occur.

By stimulating NGF production, Lion’s Mane supports the molecular environment that favours neuroplastic adaptation. This makes it particularly relevant for learning-intensive activities (academic study, skill acquisition, new language learning) and for older adults where NGF signalling naturally declines and maintaining synaptic density becomes a priority for cognitive preservation.

Clinical evidence

A landmark double-blind, randomised, placebo-controlled trial published in Phytotherapy Research (Mori et al., 2009) found that Japanese adults aged 50–80 with mild cognitive impairment who received Lion’s Mane powder (three grams daily) for 16 weeks scored significantly higher on the Hasegawa Dementia Scale compared to placebo, with cognitive scores declining after supplementation cessation. This trial established the time-dependent nature of Lion’s Mane’s benefits and the reversibility of its effects.

A more recent randomised trial published in the Journal of Medicinal Food (2020) found that Lion’s Mane supplementation in healthy younger adults (30–60 years) improved scores on cognitive assessments of attention, executive function, and processing speed compared to placebo over 12 weeks, extending the evidence beyond older adults with cognitive impairment to healthy individuals seeking cognitive maintenance.

Lion's mane in Memodyne

In Memodyne’s formula, Lion’s Mane occupies the neuronal maintenance and NGF support role — the one ingredient addressing the structural biological foundation of long-term cognitive health rather than immediate neurotransmitter modulation. Combined with Bacopa’s hippocampal antioxidant protection and Phosphatidylserine’s neuronal membrane support, Memodyne provides a comprehensive neuronal structural health layer alongside its neurotransmitter, vascular, and metabolic ingredients.