The Fadiman Protocol vs Stamets Protocol: Which Microdosing Schedule Is Best?

Two protocols dominate the microdosing world — and they represent fundamentally different philosophies about how the brain learns, adapts, and grows. Choosing the right one could make the difference between a transformative practice and a frustrating plateau.

Why Protocol Matters: The Tolerance Problem

Before comparing the two protocols, it helps to understand why any microdosing schedule has off-days at all.

Psilocybin works primarily through the 5-HT2A serotonin receptor. Like most serotonergic compounds, repeated activation leads to receptor downregulation — the brain responds to overstimulation by reducing the number and sensitivity of those receptors. This is tolerance, and with psilocybin it happens fast: research shows measurable tolerance as soon as 24 hours after a full dose, with significant buildup from daily administration.

For microdosers, this means daily dosing is self-defeating. The off-days in any protocol aren't just recovery time — they're when the receptors reset, and arguably when much of the neuroplastic benefit occurs. The integration days between doses give the brain time to consolidate new patterns of thought and connection.

The two main protocols take different approaches to this balance between stimulation and recovery — and those differences have practical consequences for how microdosing feels in daily life.

The Fadiman Protocol

James Fadiman, a Stanford-educated psychologist and one of the pioneers of psychedelic research, developed this protocol through decades of self-report data collection. It's the most studied, most cited, and most commonly followed microdosing schedule in the world.

The schedule:

• Day 1: Microdose
• Day 2: Transition day (no dose — observe any residual effects, notice mood and cognition)
• Day 3: Normal day (no dose — return fully to baseline)
• Repeat the cycle

Fadiman recommends running the protocol for 4–8 weeks, followed by a break of 2–4 weeks before resuming. This pause allows for longer-term tolerance to clear and gives you perspective on what changed during the protocol period.

Typical dose: 0.1–0.3g dried psilocybin mushrooms, or 0.5–1g fresh magic truffles. The principle is sub-perceptual — you should be able to function completely normally, work, drive, and socialise without anyone noticing.

Why it works well for most people: The two off-days between each dose create clear contrast. You notice the difference between dose days and non-dose days, which helps you calibrate your dose and evaluate whether the practice is actually working. The structured journal review at the end of a cycle also makes Fadiman's protocol inherently self-correcting.

Best for:

• Beginners — the 2-day gap makes it easier to identify effects and adjust
• People with sensitive systems who may experience overstimulation on longer schedules
• Those wanting a clear observational framework to assess the practice
• Anyone with performance-sensitive work where predictability matters (you know exactly which days are dose days)

The Stamets Protocol

Paul Stamets — mycologist, author of Fantastic Fungi, and holder of a patent on psilocybin-based neurogenesis — takes a different approach. His protocol layers three ingredients together and runs them on a more intensive schedule.

The stack:

• Psilocybin microdose (0.1–0.3g dried mushrooms / 0.5–1g fresh truffles)
• Lion's Mane mushroom (500–1000mg standardised extract)
• Niacin / Vitamin B3 (100–200mg, flush form)

The schedule: 4 days on, 3 days off. Some practitioners follow a 5-on/2-off variant, though Stamets' own description and the more frequently discussed version is 4-on/3-off. Run for up to a month at a time, then take a rest period.

Stamets' neurogenesis hypothesis: Psilocybin opens neural pathways and increases BDNF (brain-derived neurotrophic factor), promoting the formation of new synaptic connections. Lion's Mane stimulates NGF (nerve growth factor) via its active compounds hericenones and erinacines — directly supporting the growth and maintenance of nerve cells, including myelin repair. Niacin, in its flush form, causes peripheral vasodilation, which Stamets theorises helps deliver the active compounds to peripheral nerves and across the blood-brain barrier.

The theory is synergistic: psilocybin opens the window of neuroplasticity, Lion's Mane builds new connections within it, and niacin ensures both reach where they're needed.

A note on the niacin flush: Non-flush niacin (niacinamide) does not produce vasodilation. If you use it, you'll get none of the purported delivery mechanism. The flush — a warm, reddening sensation across the skin lasting 20–45 minutes — is normal, not dangerous, and diminishes with consistent use. Starting at 50mg and titrating up helps manage it.

Best for:

• Experienced microdosers who've already established a baseline with Fadiman
• Those specifically targeting long-term cognitive enhancement or neurological recovery
• People interested in the nootropic dimension of Lion's Mane independent of psilocybin
• Individuals with more flexibility in their schedule (the flush can be conspicuous in professional settings)

Head-to-Head Comparison

What Does the Research Actually Say?

This is where honest nuance is essential. The evidence for both protocols is promising — but far from conclusive.

For Fadiman's approach: The strongest evidence comes from Fadiman's own large-scale self-report study, which collected data from over 1,000 microdosers across multiple countries and found widespread reports of improved mood, focus, creativity, and reduced anxiety and depression symptoms. A 2024 systematic review (PMC11311906) confirmed measurable neural changes in six neuroimaging studies and identified numerous findings differentiating microdosing from placebo — alongside an equal number of null results.

The placebo problem: A landmark 2021 eLife "self-blinding" study — where participants tested their own ability to distinguish microdose from placebo — found that while microdosers showed improvements on several measures, those who thought they were taking a microdose (but weren't) showed similar improvements. Expectation and ritual appear to account for a meaningful portion of reported benefits.

A 2022 double-blind placebo-controlled trial in Translational Psychiatry found that microdosing psilocybin did not outperform placebo on cognitive measures in healthy participants, though mood effects were more consistent.

For the Stamets Protocol: There is currently no published clinical trial testing the full stack. Lion's Mane has solid supporting research independently — the 2009 Mori et al. double-blind study showed significant improvements in cognitive function in older adults after 16 weeks of 3g/day. But the specific neurogenesis synergy claimed by Stamets remains theoretical.

The bottom line: Both protocols likely produce real effects for many people — but the mechanism of Fadiman's is better evidenced, while Stamets' theoretical framework is intellectually compelling but awaiting clinical validation. Keeping a structured journal is, in both cases, your most important tool for distinguishing personal effect from placebo.

Which Protocol Fits Your Goals?

One approach used by more experienced practitioners: start with 4–8 weeks of the Fadiman Protocol to establish your baseline and calibrate your dose, then transition to the Stamets Protocol to explore the neuroplasticity dimension with a Lion's Mane and Niacin addition. This "Fadiman first" approach lets you understand your personal response to psilocybin before adding complexity.

Other Protocols Worth Knowing

While Fadiman and Stamets are the most discussed, they're not the only options:

Intuitive microdosing — No fixed schedule; dose when you feel you need it, with at least one day off between doses. Better for experienced practitioners who know their response well. Risk: less systematic; easier to rationalize more frequent use.

Every-other-day (One-day-on / One-day-off) — Dose on Day 1, off Day 2, dose Day 3, off Day 4. More frequent than Fadiman but with consistent rest. Used by some for sustained low-level support. Well suited to those seeking quick focus and day-to-day performance rather than longer neuroplastic change.

2-on / 2-off (nightcap variant) — Some practitioners dose in the evening before sleep to avoid any daytime overstimulation, particularly with the Stamets stack where the niacin flush may be inconvenient during the workday.

For a first protocol, Fadiman or Stamets remain the best starting points — they're structured, well-documented, and have the largest knowledge base of user experience to draw from.

Practical Tips for Either Protocol

Start lower than you think. Most beginners overdose their microdose. 0.5–0.7g of fresh truffles is a sensible starting point; you can always increase. Too high a microdose crosses into perceptual territory and will compromise function.

Keep a journal. The evidence is clear that placebo effects are significant in microdosing. A simple daily log (mood 1–10, focus 1–10, sleep quality, notable observations) run across a full protocol cycle gives you real data about your personal response. Review it at the end of the cycle before deciding whether to continue.

Timing matters. Both protocols work best taken in the morning, with food or shortly after waking. This gives the effects time to unfold during the day and clear before sleep. The niacin flush in the Stamets Protocol is easiest to manage at home in the morning.

Take the rest periods seriously. The 2–4 week break after a full Fadiman cycle, or the week-off after a Stamets month, is not optional. It clears tolerance fully, gives you perspective on baseline, and ensures the practice remains meaningful rather than habitual.

For the Stamets Protocol specifically: Use flush niacin (nicotinic acid), not niacinamide. Start at 50mg and increase over the first week. Lion's Mane is most effective as a standardised fruiting body or mycelium extract — not a whole mushroom powder.

→ For a deep dive into the Stamets Stack's three-ingredient science, see our full guide: The Stamets Stack Explained: Psilocybin + Lion's Mane + Niacin

→ New to microdosing entirely? Start here: Microdosing Psilocybin: The Complete Beginner's Guide

Frequently Asked Questions

Which protocol is better for beginners?

The Fadiman Protocol. The two off-days between each dose create clear contrast that makes it easier to observe your personal response, calibrate your dose, and assess whether the practice is working. Start here before considering the Stamets Protocol.

Can I combine Lion's Mane with the Fadiman Protocol?

Yes — many people add Lion's Mane to the Fadiman Protocol without following the full Stamets schedule. You can take Lion's Mane daily (it has a good independent evidence base and no significant downsides) while running a Fadiman psilocybin schedule. You'd simply omit the niacin component and the strict 4-on/3-off timing.

What happens if I miss a dose day?

Nothing dramatic. Just return to your normal cycle on the next scheduled day. Don't double up. The protocol is flexible — what matters most is maintaining the off-day gaps, not hitting every dose day precisely.

How do I know if my dose is correct?

A correct microdose should be sub-perceptual: you should be able to function completely normally, have a conversation without anyone noticing, drive, and work. If you feel euphoric, perceive visual changes, or feel noticeably altered, your dose is too high. A slight increase in sensory richness or gentle mood lift is within the expected range.

Is the niacin flush dangerous?

No. The flushing and warming sensation from nicotinic acid (flush niacin) is caused by prostaglandin release — it's a normal physiological response, not an allergic reaction or sign of harm. It typically lasts 20–45 minutes and diminishes significantly after 1–2 weeks of consistent use. Starting at 50mg and increasing gradually over the first week is the best way to manage it.

Are magic truffles legal in the Netherlands?

Yes. Magic truffles (sclerotia of psilocybin-containing fungi) are legal to purchase and possess in the Netherlands, where they are sold by licensed smartshops. They are distinct from magic mushrooms (which are prohibited) and are widely available from reputable vendors like Azarius. If you are outside the Netherlands, check the legal status in your country before purchasing.

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This article is for informational and harm reduction purposes only. Psilocybin is a controlled substance in many countries. Always check the legal status in your jurisdiction before obtaining or using any psychedelic compound.

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Written by Smart Supplements Editorial Team | Last updated: February 26, 2026