The Stamets Stack: Lion's Mane, Psilocybin, and Niacin Explained

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<h1>The Stamets Stack: Lion's Mane, Psilocybin, and Niacin Explained</h1>

<p>In 2019, mycologist and psychedelic researcher Paul Stamets proposed a specific combination for microdosing that has since become one of the most widely used protocols in the community: psilocybin mushrooms combined with lion's mane mushroom (Hericium erinaceus) and niacin (vitamin B3). He calls it the "Stamets Stack," and the rationale behind it is more scientifically grounded than most supplement combinations.</p>

<h2>The Three Components</h2>

<h3>Psilocybin</h3>

<p>Psilocybin promotes neuroplasticity — the growth of new synaptic connections — through its effects on BDNF (brain-derived neurotrophic factor) and TrkB receptor signalling. This is the foundation of its antidepressant and cognitive-enhancing effects. In the Stamets Stack, psilocybin is taken at a sub-perceptual microdose (0.1–0.3g of dried mushroom equivalent).</p>

<h3>Lion's Mane Mushroom</h3>

<p>Lion's mane is the most evidence-backed non-psychedelic mushroom for cognitive health. Its active compounds — hericenones and erinacines — stimulate the production of Nerve Growth Factor (NGF), a protein essential for the growth, maintenance, and survival of neurons. NGF is particularly important in the hippocampus and prefrontal cortex — the regions most affected by depression, anxiety, and ageing.</p>

<p>Stamets' hypothesis is that psilocybin and lion's mane work synergistically: psilocybin creates the neuroplastic "window" (increased BDNF, new synaptic growth), while lion's mane provides the NGF needed to consolidate and maintain those new connections. Together, they may produce more durable neuroplastic changes than either alone.</p>

<h3>Niacin</h3>

<p>Niacin (vitamin B3) is included for two reasons. First, as a vasodilator, it increases blood flow to the brain and periphery, potentially improving the delivery of psilocybin and lion's mane compounds to neural tissue. Second, niacin has its own neuroprotective properties and is involved in NAD+ synthesis — a key molecule in cellular energy metabolism and DNA repair.</p>

<p>The "niacin flush" — the characteristic skin flushing and tingling that occurs with higher doses — is considered by some practitioners to be a useful indicator of peripheral blood flow and a mild biofeedback mechanism. Others use non-flush niacin to avoid this effect.</p>

<h2>Does the Stack Actually Work?</h2>

<p>Formal clinical evidence specifically for the Stamets Stack is limited — no randomised controlled trial has tested the combination as a whole. However, the individual components have strong evidence bases, and the synergistic hypothesis is biologically plausible.</p>

<p>Survey data from the Imperial College London microdosing study found that users of the Stamets Stack reported greater improvements in mood, focus, and cognitive function than users of psilocybin alone — though this is observational data and subject to selection bias.</p>

<p>Anecdotally, the Stamets Stack is consistently rated as one of the most effective microdosing protocols by experienced practitioners, particularly for cognitive enhancement and depression.</p>

<h2>Dosing and Protocol</h2>

<p>Stamets recommends a 4-days-on, 3-days-off schedule (rather than the Fadiman protocol's 1-on, 2-off). Typical doses are 0.1–0.3g psilocybin mushroom, 50–200mg lion's mane extract, and 100–200mg niacin. The niacin is taken 20–30 minutes after the psilocybin and lion's mane to allow the flush to coincide with peak psilocybin absorption.</p>

<h2>Frequently Asked Questions</h2>

<h3>What is the Stamets Stack?</h3>

<p>The Stamets Stack is a microdosing protocol combining sub-perceptual psilocybin, lion's mane mushroom, and niacin, proposed by mycologist Paul Stamets for synergistic neuroplasticity and cognitive enhancement.</p>

<h3>Does lion's mane enhance psilocybin effects?</h3>

<p>The hypothesis is that lion's mane's NGF-stimulating effects complement psilocybin's BDNF-mediated neuroplasticity, potentially producing more durable cognitive and mood improvements. Formal evidence is limited but the biological rationale is sound.</p>

<h3>Can I take the Stamets Stack for depression?</h3>

<p>Many people use the Stamets Stack specifically for depression, and anecdotal reports are positive. The combination of psilocybin's serotonergic effects, lion's mane's neuroprotective effects, and niacin's vasodilatory properties addresses depression through multiple pathways simultaneously.</p>

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