Fadiman vs. Stamets Microdosing Protocols: A Detailed Comparison
Two protocols dominate microdosing practice: the Fadiman Protocol (named for researcher James Fadiman) and the Stamets Stack (named for mycologist Paul Stamets). They differ significantly in schedule, intention, and supplementation approach. This guide compares them directly.
The Fadiman Protocol
Developed by: James Fadiman, PhD, researcher and author of The Psychedelic Explorer's Guide
Schedule:
- Day 1: Dose
- Day 2: Rest (transition day)
- Day 3: Rest (return to baseline)
- Day 4: Dose (repeat cycle)
Dose: 0.05–0.3g dried psilocybin mushrooms (individuals vary; 0.1g is a common starting point)
Duration: Typically practiced in 4-8 week cycles, followed by a break of 2-4 weeks
Philosophy: The Fadiman protocol is a research-originated observational framework. Fadiman collected thousands of self-reports from microdosers and designed the protocol around two principles: (1) every-other-day-or-more-frequent dosing creates tolerance, so the two rest days allow full receptor reset; (2) the transition day (Day 2) is considered psychologically significant — many practitioners report that insights continue to emerge.
Best for: People doing structured self-experimentation; those wanting the most researched protocol; people who want clear dose and non-dose day distinction
The Stamets Stack
Developed by: Paul Stamets, mycologist and founder of Host Defense Mushrooms
Schedule:
- Days 1–4: Dose
- Days 5–7: Rest
- Repeat weekly cycle
Dose: Psilocybin mushrooms (0.05–0.5g) + Lion's Mane mushroom (50–200mg) + Niacin (vitamin B3, 100–200mg)
Why Lion's Mane: Stamets proposes that Lion's Mane (Hericium erinaceus) stimulates Nerve Growth Factor (NGF) production, which combined with psilocybin's neuroplasticity effects, may produce synergistic neurogenesis. This is a hypothesis; the combination has not been studied in clinical trials.
Why Niacin: Stamets proposes that niacin's peripheral vasodilatory effect (the "niacin flush") acts as a carrier, helping deliver psilocin and Lion's Mane alkaloids across the blood-brain barrier. This is also a hypothesis without direct evidence. The niacin flush — redness and tingling — can be uncomfortable; non-flush niacin (nicotinamide) is sometimes substituted, though this removes the presumed delivery mechanism.
Philosophy: Neurogenesis and brain health as primary goals, not just functional improvement
Best for: People specifically interested in cognitive enhancement and brain health; those comfortable with supplement stacking; people whose work schedule doesn't fit every-4th-day dosing
Direct Comparison
| Factor | Fadiman Protocol | Stamets Stack | |--------|-----------------|---------------| | Frequency | Every 4 days | 4 days on, 3 off | | Supplements | Psilocybin only | + Lion's Mane + Niacin | | Evidence base | Observational research | Hypothesis; less researched | | Complexity | Simple | More complex | | Cost | Low | Higher (Lion's Mane, Niacin) | | Best for | Self-experimentation | Neurogenesis goals | | Tolerance management | 3-day gaps | 3 rest days per week |
A Third Option: Intuitive Dosing
Some experienced microdosers abandon fixed schedules after an initial protocol period and dose "as needed" — responding to their internal state rather than a calendar. This is not recommended for beginners (no baseline comparison, harder to track effects) but many practitioners settle here after 6-12 months of structured protocols.
Practical Recommendations
Starting out: Use the Fadiman protocol. The 4-day cycle is simple, well-documented, and produces clear data for self-tracking. Keep a journal from day 1.
Wanting cognitive enhancement: The Stamets Stack adds supplements that may provide additional benefit — or may not. The psilocybin component drives the effects; the addition of Lion's Mane and Niacin is a reasonable hypothesis worth testing individually.
Tolerance concerns: Both protocols are designed to prevent tolerance. If you find effects diminishing even within protocol, this is a signal to take an extended break (2-4 weeks off entirely) before resuming.
What Neither Protocol Specifies
Neither Fadiman nor Stamets has published controlled trial data showing their specific protocol produces better outcomes than alternatives. The protocols are starting points derived from observational data and theoretical reasoning — not clinical prescriptions. Self-tracking your specific response matters more than protocol adherence.