Lion's Mane and Neuroplasticity: What the Research Says
Can a mushroom really grow new brain cells? We review the current evidence on Lion's Mane, NGF stimulation, and long-term cognitive health.
Lion's Mane (Hericium erinaceus) is a medicinal mushroom that has been used in traditional Chinese and Japanese medicine for centuries. In recent years, it has attracted serious scientific attention for its potential to support cognitive function through a mechanism unlike any other known supplement.
The NGF connection
Nerve Growth Factor (NGF) is a protein essential for the growth, maintenance, and survival of neurons. Without adequate NGF, neurons degrade — a process implicated in age-related cognitive decline and neurodegenerative conditions. Lion's Mane contains two classes of compounds — hericenones and erinacines — that have been shown to stimulate NGF synthesis.
This is significant because NGF itself cannot cross the blood-brain barrier when administered externally. The compounds in Lion's Mane, however, can — making this mushroom one of the only known dietary sources of NGF-stimulating molecules that actually reach the brain.
What the human studies show
The landmark human trial on Lion's Mane was a 2009 double-blind, placebo-controlled study published in Phytotherapy Research. Fifty Japanese adults with mild cognitive impairment were given 3g of Lion's Mane daily for 16 weeks. The treatment group showed significantly improved cognitive function scores compared to placebo — and the benefits declined after supplementation stopped, suggesting active dependence on continued intake.
A 2020 pilot study found that 1.8g daily for 8 weeks in adults with depression and anxiety led to significant reductions in both conditions compared to placebo. This aligns with the hypothesis that NGF upregulation has downstream effects on mood, not just memory.
Neuroplasticity: the bigger picture
Neuroplasticity refers to the brain's ability to reorganise and form new neural connections in response to learning, experience, or injury. NGF is central to this process — it supports the growth of axons (the long projections that connect neurons) and the formation of new synapses.
By supporting NGF production, Lion's Mane may help maintain the brain's adaptability over time — which matters for learning, memory consolidation, and resilience to cognitive aging.
Practical considerations
The active compounds in Lion's Mane are primarily found in the fruiting body (the mushroom itself), not the mycelium (root structure). Many cheaper supplements use mycelium grown on grain — which contains primarily grain starch, not the active hericenones and erinacines. Always look for fruiting body extract standardised to active compound content.
Typical effective doses in clinical studies range from 500mg to 3g of fruiting body extract daily. Effects are cumulative and most noticeable after 4–8 weeks of consistent use.
