If you have spent any time researching microdosing, two names come up more than any others – Paul Stamets and Dr. James Fadiman. Each developed a distinct microdosing protocol that has become a cornerstone of the psilocybin microdosing community, and choosing between the Stamets Stack and the Fadiman Protocol is often the first real decision new microdosers face.
Both approaches share the same fundamental goal: delivering sub-perceptual amounts of psilocybin on a structured schedule, with practitioners reporting subtle, cumulative shifts in mood, focus, and cognitive function across observational studies.
But they differ meaningfully in dosing frequency, composition, and underlying philosophy. One is minimalist and carefully spaced; the other is a multi-compound nootropic system designed for synergy.
This comparison breaks down both protocols side by side – how they work, who they are designed for, and how to decide which one aligns with your goals and experience level.
Key Takeaways
- The Fadiman Protocol follows a one-day-on, two-days-off schedule using psilocybin alone – it is the most beginner-friendly microdosing approach.
- The Stamets Stack uses a four-days-on, three-days-off schedule and combines psilocybin with Lion’s Mane mushroom and niacin (vitamin B3) for a proposed synergistic nootropic effect.
- Both protocols use sub-perceptual psilocybin doses, but the Stamets Stack’s higher dosing frequency and added compounds make it a more intensive regimen.
- The Fadiman Protocol prioritizes observation and self-tracking, while the Stamets Stack is designed around a proposed long-term cognitive enhancement effect.
- Your choice should depend on your experience level, goals, and willingness to manage a multi-compound protocol.
The Fadiman Protocol: Simplicity and Structure
Dr. James Fadiman is a psychologist, researcher, and author whose work on microdosing has shaped how millions of people approach psilocybin as a plant medicine. His protocol – first outlined in his 2011 book and refined through years of collecting self-reported data from practitioners around the world – is the most widely adopted microdosing schedule in existence.
How It Works
The Fadiman Protocol follows a simple three-day cycle: Day 1 is your dose day, Day 2 is a transition day where you observe any residual effects, and Day 3 is a rest day where you return fully to baseline. On Day 4, the cycle repeats.
A typical protocol cycle runs four to eight weeks, after which Fadiman recommends taking a break of two to four weeks before starting again. This break allows you to assess the cumulative effects of the protocol and prevents long-term tolerance development.
The Philosophy Behind It
Fadiman’s approach is rooted in careful observation. The two rest days between doses are not just about preventing tolerance – they create a built-in comparison framework. Day 2 often carries a subtle “afterglow” that many practitioners notice, while Day 3 serves as a true control day. Over several weeks, this structure makes it easier to identify genuine patterns versus placebo effects or coincidence.
Fadiman has consistently emphasized that microdosing is about noticing subtle shifts, not chasing dramatic effects. His protocol is designed to support that philosophy with generous spacing and minimal variables.
Who It Is Best For
The Fadiman Protocol is widely recommended as the starting point for anyone new to microdosing. Its simplicity – one compound, a straightforward schedule, and plenty of rest days – makes it the lowest-barrier entry point into structured psilocybin use. It is also well-suited for people who want to isolate the effects of psilocybin without the additional variables that a multi-compound stack introduces.
The Stamets Stack: A Proposed Nootropic System for Cognitive Support
Paul Stamets is a mycologist, author, and one of the world’s most recognized authorities on fungi. His microdosing protocol takes a fundamentally different approach from Fadiman’s – rather than using psilocybin in isolation, the Stamets Stack protocol combines three compounds into a system theorized to work synergistically toward long-term cognitive support.
The Three Components
Psilocybin. The foundation of the stack, delivered at a standard microdose level (typically 0.1 to 0.3 grams of dried mushroom equivalent). Psilocybin interacts with serotonin receptors and is believed to promote neuroplasticity – the brain’s capacity to form and reorganize neural connections.
Lion’s Mane mushroom. A functional mushroom that has been independently studied for its potential to stimulate nerve growth factor (NGF) production. NGF is a protein critical to the growth, maintenance, and survival of neurons.
Stamets theorizes that combining Lion’s Mane with psilocybin amplifies the neurogenic potential of both compounds. Products like Mycrologi’s Divinity Blend incorporate this kind of intentional pairing.
Niacin (vitamin B3). The most debated element of the stack. Stamets includes niacin as a vasodilator – it causes blood vessels to expand, which he proposes helps distribute the psilocybin and Lion’s Mane compounds more effectively throughout the body, including to the peripheral nervous system. The characteristic “niacin flush” (a temporary reddening and warming of the skin) is a known effect of this vitamin and is generally harmless, though some people find it uncomfortable.
The Dosing Schedule
The Stamets Stack follows a four-days-on, three-days-off cycle. This is a notably more frequent dosing cadence than the Fadiman Protocol. All three compounds are taken together on each dose day.
Like the Fadiman Protocol, the Stamets Stack is typically followed for four to eight weeks before taking a reset break.
Who It Is Best For
The Stamets Stack is generally considered more appropriate for intermediate microdosers who have already established their baseline response to psilocybin. The higher dosing frequency and the addition of two supplementary compounds introduce more variables, which makes it harder for a complete beginner to identify what is producing which effects.
It appeals most to people specifically interested in the nootropic and cognitive enhancement dimensions of microdosing.
Head-to-Head Comparison: Stamets Stack vs Fadiman Protocol
Here is how the two protocols compare across the factors that matter most when choosing a microdosing schedule:
Dosing frequency. The Fadiman Protocol doses once every three days (roughly twice per week). The Stamets Stack doses four consecutive days per week. This means the Stamets Stack delivers approximately twice as many dose days per cycle.
Compounds used. Fadiman uses psilocybin alone. The Stamets Stack combines psilocybin with Lion’s Mane and niacin. This makes the Stamets Stack a more complex regimen with more variables to manage.
Ease of use. The Fadiman Protocol wins on simplicity. One compound, a repeating three-day cycle, minimal decision-making. The Stamets Stack requires sourcing and coordinating three separate supplements (or finding a product that combines them).
Observation and tracking. Fadiman’s design explicitly builds in observation days, making it easier to identify patterns and isolate the effects of psilocybin. The Stamets Stack’s consecutive dose days provide less contrast between on and off days, which can make self-assessment more nuanced.
Scientific support. Neither protocol has been validated by large-scale, peer-reviewed clinical trials – both are community-developed approaches informed by theoretical mechanisms and observational evidence. That said, the individual components of the Stamets Stack (psilocybin and Lion’s Mane) each have their own emerging bodies of research, and the combination hypothesis is scientifically plausible even if unproven.
Tolerance management. The Fadiman Protocol’s generous rest days provide a stronger safeguard against tolerance buildup. The Stamets Stack’s four consecutive dose days carry a slightly higher theoretical risk of diminishing returns, though the three-day break is intended to offset this.
Can You Combine or Customize These Protocols?
Many experienced microdosers eventually develop a personalized approach that borrows elements from both protocols. Some common adaptations include:
- Following the Fadiman schedule but adding Lion’s Mane on all days (dose and rest)
- Using the Stamets Stack’s compound combination but on a less frequent dosing cadence
- Adjusting cycle length based on personal response
- Alternating between protocols across different cycles
There is no single “correct” protocol. The best approach is the one that produces consistent, positive results for you over time. Both Fadiman and Stamets have emphasized that microdosing is a personal practice – their protocols are frameworks, not rigid prescriptions.
Explore both protocols in full detail on Mycrologi’s dedicated protocols page to see dosing schedules, recommended cycle lengths, and practical guidance for getting started.
Choosing the Right Protocol for Your Microdosing Journey
The choice between the Stamets Stack and the Fadiman Protocol ultimately comes down to where you are in your microdosing journey and what you hope to achieve.
If you are new to microdosing, start with the Fadiman Protocol. Its simplicity, generous rest days, and single-compound design make it the most straightforward way to establish your baseline and learn how psilocybin affects you personally.
Once you have completed a few cycles and feel confident in your response, you will be in a much better position to evaluate whether the Stamets Stack’s multi-compound approach adds value.
If you are an experienced microdoser with a clear interest in nootropic stacking and cognitive enhancement, the Stamets Stack offers a more ambitious framework. The combination of psilocybin, Lion’s Mane, and niacin represents a compelling hypothesis about synergistic neurogenesis – and many practitioners report subjectively different experiences with the stack compared to psilocybin alone.
Either way, the most important factors remain the same: use quality products with transparent dosing, follow a consistent schedule, track your experience, and give the process enough time to reveal meaningful patterns.
Browse Mycrologi’s microdose capsule collection to find formulations designed for both protocol approaches.
Frequently Asked Questions
What is the Stamets Stack?
Also referred to as the Stamets Protocol or the Paul Stamets protocol, the Stamets Stack is a microdosing protocol developed by mycologist Paul Stamets that combines three compounds: psilocybin (at a microdose level), Lion’s Mane mushroom, and niacin (vitamin B3). The protocol follows a four-days-on, three-days-off schedule and is based on the theory that these three substances work synergistically to promote neuroplasticity and potential long-term cognitive support.
Is the Fadiman Protocol better for beginners?
Yes, the Fadiman Protocol is widely considered the best starting point for microdosing beginners. It uses psilocybin alone on a one-day-on, two-days-off schedule, which is simpler to follow and makes it easier to identify how psilocybin specifically affects you without the added variables of a multi-compound stack.
Can you switch between the two protocols?
Yes – many practitioners start with the Fadiman Protocol to establish their baseline, then transition to the Stamets Stack after a few successful cycles. Some alternate between the two or develop a hybrid approach based on their personal results. Taking a two-to-four-week break between protocol changes is recommended.
Does the Stamets Stack require specific products?
The Stamets Stack requires three separate compounds: a psilocybin microdose, Lion’s Mane mushroom, and niacin. Some brands offer combination capsules – like Mycrologi’s Neuro-Blend – that include complementary compounds in a single product, which simplifies the process. If sourcing separately, ensure each component is from a reputable, transparent supplier with clear dosing information.
How long should you follow a protocol before evaluating results?
Both Fadiman and Stamets recommend following a protocol for at least four to eight weeks before drawing conclusions about its effects. Meaningful patterns typically emerge after two to three weeks, but a full cycle gives you enough data points to distinguish genuine changes from day-to-day variation. Keeping a daily journal is essential for accurate self-assessment.
