The Stamets Stack, Explained

The Stamets Stack is probably the most talked about microdosing protocol in circulation right now. If you have spent any time reading about microdosing, you have seen it mentioned. This is the plain English version of what it actually is, why Paul Stamets designed it the way he did, and how to run it correctly.

Who Paul Stamets is and why it matters

Paul Stamets is a mycologist, researcher, and author who has spent decades studying fungi and their relationship to human health. He is not a fringe figure. He holds patents, has published research, and has been cited in peer-reviewed literature. When he proposed his microdosing stack, it was based on a specific theory about how psilocybin and lion's mane interact at the neurological level, not on a hunch.

That said, the stack itself has not been studied in a rigorous clinical trial. The evidence for it is a combination of Stamets's reasoning from pharmacology, a large body of anecdotal reports, and emerging research on both psilocybin and lion's mane separately. It is the most credible protocol available, which is different from saying it is proven.

The three components

The Stamets Stack combines three things.

Psilocybin, which is the primary active compound. In a microdose context this is typically 50 mg to 200 mg of Psilocybe cubensis, depending on your tier.

Organic lion's mane, Hericium erinaceus, which is a medicinal mushroom with well-documented effects on nerve growth factor. Stamets proposes that lion's mane amplifies the neurogenic effects of psilocybin, essentially helping the brain form new connections during the dosing window.

Niacin, vitamin B3 in its flush form, which Stamets includes as a peripheral vasodilator. The theory is that niacin helps carry the other compounds across the blood-brain barrier more effectively, and that the characteristic niacin flush (a warm tingling sensation on the skin) serves as a useful signal that you have taken an active dose.

Sacred Cybin includes all three in the Pure line as standard.

The schedule

Four days on, three days off. That is the core of it.

Days one through four you take one dose in the morning with a small amount of food. The food matters because psilocybin on an empty stomach can cause nausea at higher doses.

Days five, six, and seven are rest days. No dose. This is not optional. The rest days are when the neurogenic effects consolidate and when your receptor sensitivity is maintained.

You repeat this four week cycle, then take a two week break before beginning again.

What the niacin flush feels like

If you have never taken flush niacin before, the first few times can be surprising. Within twenty to forty minutes of taking the stack you may feel a warm flushing sensation on your skin, particularly on your face, chest, and arms. It is harmless and passes within thirty to sixty minutes. It can be reduced by taking the stack with food and staying well hydrated. Many practitioners come to find it a useful signal, a confirmation that the stack is active.

If the flush is uncomfortable you can start with a lower niacin dose and work up. The standard Stamets formulation uses 5 mg of niacin per capsule, which is a low amount relative to what is typically sold as a standalone niacin supplement.

How to track it

The most useful thing you can do when running the Stamets Stack is keep a simple daily log. Not elaborate, just one to three lines. What did you notice today. What did your energy feel like. What surprised you. After four weeks you will have a picture of how your nervous system responds to this particular protocol, and that picture is worth more than any general guide including this one.

Common questions

Can I run it daily instead of four on three off? Some people do, but Stamets specifically recommends the cycling schedule for receptor sensitivity reasons. If you run it daily you will likely find diminishing returns by week two or three.

Should I take it in the morning or the evening? Morning, with food, is the standard recommendation. Psilocybin at microdose levels does not typically interfere with sleep, but the neurogenic activation is thought to be more useful during the waking hours when the brain is engaged.

What if I feel nothing? Give it two full weeks before adjusting. Some people have slower receptor response, and the effects of lion's mane on nerve growth factor accumulate over time.

Is this the right protocol for me? The Stamets Stack tends to suit people who want structure and are comfortable with a more active dosing schedule. If you prefer a gentler rhythm, look at the Fadiman Protocol instead. Both are valid entry points.