Microdosing for Cognitive Performance: The Neural Farmer Guide

The complete Stamets Stack protocol — what's in it, why each ingredient is there, the dosing schedule, the science, and the honest limits of what the research currently shows.

By The Microdose Movement · April 10, 2026

Archetype: neural farmer

You optimize everything else. Sleep, training, nutrition, the morning routine, the supplement stack, the standing desk, the air filter, the circadian light. You read the studies before you commit. You test, measure, and adjust. The brain is the next frontier and you already know it.

The Stamets Stack is the protocol most biohackers run when they want to do for the brain what they have already done for the body. It is the most popular structured microdosing protocol after the Fadiman protocol, and the only one explicitly designed to combine three compounds with overlapping mechanisms of action. Whether you trust the underlying theory or not, the protocol is worth understanding before you start running experiments on yourself.

This article covers what is actually in the stack, where it came from, the dosing schedule, the science behind each component, and the honest limits of what the research currently shows.

Who is Paul Stamets?

Paul Stamets is an American mycologist, the author of six books on fungi, the founder of Fungi Perfecti, and one of the most influential voices in the modern mushroom-as-medicine movement. He has spent more than four decades studying fungal biology and is responsible for much of the popular understanding of medicinal mushrooms — Lion’s Mane, Reishi, Turkey Tail, Cordyceps, Chaga — that has become standard wellness vocabulary in the past decade.

Stamets first proposed the stack named after him during a public talk in 2017. The protocol came out of his hypothesis that combining low-dose psilocybin with two specific co-factors would produce more sustained neurogenesis and cognitive benefit than psilocybin alone. The hypothesis is grounded in real research on the individual components, but the combined stack itself has not yet been formally studied in clinical trials. This matters and we will come back to it.

His TED talks, his appearances on the Joe Rogan podcast, and his collaboration with the Quiet Mind Foundation have made the stack one of the most widely-discussed protocols in the microdosing community.

What’s in the stack?

Three ingredients, each chosen for a different reason.

1. Psilocybin (microdose)

The active psychedelic compound. In the stack, it serves as the primary driver of acute neuroplastic effect. See our explainer on psilocybin and neuroplasticity for the deeper mechanism — the short version is that psilocybin appears to promote rapid growth of dendritic spines in the cortex within 24 hours of a single dose, mediated through the 5-HT2A receptor.

Form: Dried psilocybin mushrooms, typically Psilocybe cubensis Dose: 0.1 to 0.2 grams (sub-perceptual)

2. Lion’s Mane (Hericium erinaceus)

A non-psychedelic medicinal mushroom that produces two classes of compounds — hericenones and erinacines — which act as nerve growth factor (NGF) mimetics. NGF is a protein essential for the survival, maintenance, and growth of neurons in the brain and peripheral nervous system. The Stamets hypothesis is that Lion’s Mane provides the long-term structural growth scaffolding while psilocybin provides the acute plasticity signal. They work on overlapping but distinct parts of the same system.

The Lion’s Mane research base is more developed than the psilocybin microdosing research:

Mori et al. (2009) ran a double-blind placebo-controlled trial in adults with mild cognitive impairment. Sixteen weeks of Lion’s Mane supplementation produced significant improvement in cognitive function scores compared to placebo. Effects faded after the supplement was discontinued.
Nagano et al. (2010) showed Lion’s Mane supplementation reduced symptoms of depression and anxiety in a sample of menopausal women, with effects detectable after four weeks.
Saitsu et al. (2019) replicated the cognitive findings in healthy older adults.
Lai et al. (2013) demonstrated in vitro that Lion’s Mane extract stimulates neurite outgrowth in cultured neurons via NGF-pathway activation.

Form: Dried fruiting body, dual-extract powder, or capsule Dose: 50–200mg of standardized extract, or 1–5g of dried fruiting body equivalent

3. Niacin (Vitamin B3)

The most contested ingredient in the stack and the one most beginners cut. Stamets includes niacin specifically because it produces a vasodilation reaction (the well-known “niacin flush” — flushing, warmth, mild itching that lasts 15–30 minutes) which he argues helps the active compounds distribute more thoroughly through peripheral nervous system tissue. His framing is that niacin acts as a delivery mechanism, helping the psilocybin and Lion’s Mane reach the entire nervous system rather than just the central brain.

The clinical evidence for this specific mechanism is thin. Niacin’s vasodilatory effects are well-documented. The argument that this meaningfully changes psilocybin or Lion’s Mane bioavailability has not been tested in formal research. Stamets has been clear in his public talks that this is hypothesis-stage rather than established fact.

Form: Plain niacin (nicotinic acid), NOT no-flush niacin or niacinamide. The flush is the point. Dose: 100–200mg, taken with the other compounds

Important: Niacin at higher doses can cause liver issues and should not be taken by anyone with liver disease, gout, or who is on medications affected by hepatic enzymes. Consult a practitioner before adding it to your regimen.

The Dosing Schedule

The Stamets protocol follows a different rhythm than other microdosing protocols. Most use shorter cycles. The Stamets Stack uses a longer one: four days on, three days off.

Day	Dose
Day 1	Psilocybin + Lion’s Mane + Niacin
Day 2	Psilocybin + Lion’s Mane + Niacin
Day 3	Psilocybin + Lion’s Mane + Niacin
Day 4	Psilocybin + Lion’s Mane + Niacin
Day 5	Off — rest and integration
Day 6	Off
Day 7	Off

The cycle repeats for 4–8 weeks, followed by at least 2 weeks completely off. Some experienced users continue Lion’s Mane through the off-days while pausing only the psilocybin and niacin. Stamets has described this variation in interviews as acceptable for users who are tracking long-term cognitive markers.

Why the four-on, three-off pattern:

Tolerance to psilocin builds quickly. Four consecutive days approaches the upper limit of useful daily dosing before diminishing returns set in.
The three-day off window gives the 5-HT2A receptors full time to reset to baseline sensitivity.
The longer on-cycle creates more sustained downstream pressure on neuroplastic processes than alternating-day protocols.

What does the research actually show?

This is where the honest framing matters.

The individual components have research behind them. Psilocybin and neuroplasticity is well-established at full doses and increasingly supported at low doses. Lion’s Mane’s effects on cognitive function and neurite growth are documented in multiple peer-reviewed studies. Niacin’s vasodilatory and metabolic effects are textbook pharmacology.

The combined stack has not been formally studied. No published clinical trial has tested the Stamets Stack against placebo, against psilocybin alone, or against any other comparator. The synergy hypothesis — that the three compounds combined produce greater benefit than any one alone — is theoretically plausible but unproven.

The largest data source on the combined protocol is the Quiet Mind Foundation’s volunteer study, which collected self-reported outcomes from microdosers using the Stamets Stack. Preliminary results presented at conferences in 2021–2022 suggested cognitive and mood improvements that exceeded what historical Fadiman-protocol data had shown. The full study has not been published in a peer-reviewed journal as of 2026.

The honest summary: the stack is a reasonable hypothesis based on three components with real individual research behind them. Whether the combined effect lives up to the theory is an open question that the field is still working on.

What does the first 30 days actually feel like?

The Stamets Stack tends to produce a different felt experience than the gentler Fadiman protocol. The four consecutive on-days build more sustained pressure, and the Lion’s Mane and niacin contribute their own physiological signals.

Week 1. The most noticeable effect is usually the niacin flush itself, which can be uncomfortable for the first few doses before tolerance builds. Cognitive effects from Lion’s Mane typically take 2–4 weeks to become noticeable, so the first week is largely the psilocybin signal alone. Track the niacin flush separately from cognitive changes — they are not the same thing.

Week 2. Subjective focus often improves. People report fewer mental blank spots, faster word retrieval, and a sense of being able to hold more information in working memory at once. These reports are consistent with what the Lion’s Mane cognitive function research predicts. They are also exactly the kinds of effects most vulnerable to placebo, so cross-reference with whatever objective markers you track.

Weeks 3–4. The cumulative effects become more stable. Mood often lifts, sleep often improves, and people report a sense of being more cognitively durable across long days. The psilocybin neuroplastic effects, the Lion’s Mane NGF effects, and the niacin metabolic effects appear to compound — though again, this is the area where formal research is most lacking.

The 2-week pause. Take it. The reset is part of what makes the protocol sustainable and what protects against tolerance buildup.

Common mistakes for someone running this stack

Skipping the niacin because of the flush. The flush is the point. If you cannot tolerate it at 200mg, drop to 100mg, but do not eliminate it. If you have a medical reason not to take niacin, the rest of the stack still works — just call it the modified Stamets Stack.
Cheap Lion’s Mane. The supplement market for medicinal mushrooms is full of products that contain mostly mycelium-on-grain rather than fruiting body extract. Look for dual-extracted fruiting body with documented beta-glucan content. The Real Mushrooms brand is one of the few that consistently meets this standard. Cheap Lion’s Mane is usually inert.
Going up on psilocybin too fast. The protocol is four consecutive days, not four consecutive escalations. Stay at 0.1–0.15g and increase only after a full cycle if needed.
Tracking nothing. This is a Neural Farmer’s protocol. If you are not tracking sleep, mood, HRV, cognitive performance, or something, you are running the stack on vibes and you have no way to know whether it works for you. Track at least three baseline measures before starting and again throughout.
Treating it like a one-shot. The Lion’s Mane cognitive effects in the published research take weeks to develop and fade after discontinuation. The stack is a sustained practice, not a single-cycle experiment.

How to track your stack experiment properly

If you are going to do this, do it like a proper experiment.

Two-week baseline period before starting. Measure your sleep, HRV, mood, energy, and any cognitive metrics (n-back, reaction time, dual-n-back) you care about. You need a control to compare against.
Daily quantitative log. Sleep score, HRV, subjective mood (1–10), subjective focus (1–10), and any objective cognitive testing you run.
Weekly qualitative log. Free-form notes on what changed, what surprised you, what you noticed about your work, your relationships, your reactivity.
Photo documentation of any side effects. Niacin flush, GI changes, sleep changes — anything physical worth knowing.
A second baseline period after finishing the cycle. Measure again two weeks after the last dose. The difference between your starting baseline and your post-cycle baseline is the closest thing to an n-of-1 experimental outcome you can produce.

For deeper protocol design and statistical analysis of self-experiments, see the work of the Quantified Self community.

When you should reach out for support

You are stacking on top of prescription medications, especially SSRIs or SNRIs, and want guidance on interactions
You have a history of liver issues, gout, or peptic ulcer disease (relevant for niacin)
You have a personal or family history of psychosis or schizophrenia
You are planning to combine the stack with other nootropics, racetams, or experimental compounds — interactions get complex fast

Join the Microdose Movement community for connections to people running similar protocols.

Frequently Asked Questions

What is the Stamets Stack?

The Stamets Stack is a microdosing protocol developed by mycologist Paul Stamets that combines three compounds: psilocybin (microdose), Lion’s Mane mushroom (NGF-mimetic), and niacin (vasodilator). The proposed mechanism is that the three compounds act on overlapping aspects of neurogenesis and neuroplasticity, producing greater cognitive benefit than psilocybin alone.

What is the Stamets protocol schedule?

Four days on, three days off. Each on-day includes 0.1–0.2g psilocybin, 50–200mg Lion’s Mane extract, and 100–200mg niacin. The cycle repeats for 4–8 weeks, then a 2-week pause.

Does the Stamets Stack actually work?

The individual components have research support. Psilocybin and neuroplasticity is well-established at full doses. Lion’s Mane has multiple peer-reviewed studies showing cognitive function improvement. The combined stack has not been formally studied in clinical trials. The Quiet Mind Foundation has collected volunteer data suggesting positive effects, but the full results have not been peer-reviewed.

Why does the Stamets Stack include niacin?

Stamets includes niacin specifically for its vasodilatory effect, hypothesizing that increased peripheral blood flow helps distribute the active compounds throughout the nervous system. This mechanism is theoretically plausible but has not been tested in formal research. The flush is intentional and is part of how Stamets identifies whether the niacin is active.

Can I do the Stamets Stack without psilocybin?

You can take Lion’s Mane and niacin together as a non-psychedelic cognitive support stack, and there is research supporting Lion’s Mane benefits for cognition independently. This would not technically be the Stamets Stack, which Stamets defined as the three-compound combination, but it is a legal and reasonable alternative for people who want the cognitive benefit without the psychedelic component.

What’s the best Lion’s Mane to use for the stack?

Look for dual-extracted Lion’s Mane fruiting body with documented beta-glucan content. Avoid products labeled “mycelium on grain” or that do not specify which part of the mushroom they use. Real Mushrooms, Nootropics Depot, and Oriveda are three brands that consistently meet quality standards.

Sources and Further Reading

The references below link to our science library, where each concept is broken down in depth and traced back to the original peer-reviewed research.

Psilocybin and Neuroplasticity — the rapid dendritic growth research from the Olson and Yale labs
The 5-HT2A Serotonin Receptor — the molecular target of psilocybin’s effects
James Fadiman and the Modern Microdosing Protocol — the alternative protocol most beginners start with
Psilocybin vs Psilocin — the metabolic conversion that matters for dosing

External research on Lion’s Mane:

Mori, K., et al. (2009). “Improving effects of the mushroom Yamabushitake (Hericium erinaceus) on mild cognitive impairment: a double-blind placebo-controlled clinical trial.” Phytotherapy Research, 23(3), 367–372.
Nagano, M., et al. (2010). “Reduction of depression and anxiety by 4 weeks Hericium erinaceus intake.” Biomedical Research, 31(4), 231–237.
Saitsu, Y., et al. (2019). “Improvement of cognitive functions by oral intake of Hericium erinaceus.” Biomedical Research, 40(4), 125–131.
Lai, P. L., et al. (2013). “Neurotrophic properties of the Lion’s mane medicinal mushroom, Hericium erinaceus.” International Journal of Medicinal Mushrooms, 15(6), 539–554.

Paul Stamets’s work:

Stamets, P. (2005). Mycelium Running: How Mushrooms Can Help Save the World. Ten Speed Press.
Stamets, P. (2002). MycoMedicinals: An Informational Treatise on Mushrooms. MycoMedia Productions.

Where to go from here

The Microdose Movement is an educational community, not a medical provider. Nothing in this article is medical advice. If you have liver disease, gout, peptic ulcer, or are on prescription medication, consult a practitioner before adding niacin or any new supplement to your routine.