What is the Stamets Stack?

The Stamets Stack is a microdosing protocol combining sub-perceptual doses of psilocybin, Lion's Mane mushroom (Hericium erinaceus), and niacin (vitamin B3). Developed by mycologist Paul Stamets, it is proposed to promote neurogenesis and cognitive enhancement. The typical schedule is 4 days on, 3 days off. Scientific evidence for the specific combination remains preliminary.

What supplements are commonly stacked with psilocybin microdosing?

The most commonly reported supplements alongside psilocybin microdosing include Lion's Mane mushroom (for nerve growth factor support), niacin or B3 (for vasodilation in the Stamets Stack), magnesium (for nervous system support), omega-3 fatty acids, and B-complex vitamins. Adaptogens like ashwagandha and Rhodiola are also reported.

Are supplement stacks safe to use with psilocybin?

Safety depends heavily on specific combinations. Most dietary supplements (vitamins, Lion's Mane, magnesium, omega-3) have no known dangerous interactions with psilocybin. However, serotonergic drugs (SSRIs, MAOIs, St John's Wort) carry significant risks including blunted effects or serotonin syndrome. Always research specific interactions and consult a healthcare professional when in doubt.

Supplements & Stacking

Lion's Mane

Complete guide to Lion's Mane mushroom, its benefits, and how to stack it with psilocybin.

Niacin (B3)

Understanding niacin's role in the Stamets Stack, dosage, and safety considerations.

Other Nootropics

Additional nootropics and cognitive enhancers that can be safely combined with microdosing.

Vitamin Stacking

Essential vitamins and minerals to support microdosing protocols and overall health.

Supplement Safety

Safety considerations, interactions, and best practices for supplement stacking.

Why Stack Supplements with Psilocybin?

The interest in combining supplements with psilocybin microdosing stems from two goals: amplifying neuroplasticity-related benefits, and cushioning any unwanted side effects such as anxiety or disrupted sleep. The most widely cited framework is the Stamets Stack, which pairs sub-perceptual psilocybin (0.1–0.3 g dried mushrooms) with Lion's Mane mushroom extract and flush-dose niacin on a 4-days-on, 3-days-off schedule. While the scientific evidence for the specific combination is preliminary, its constituent parts each have independent research support.

Evidence-Supported Supplements

Lion's Mane (Hericium erinaceus): Stimulates Nerve Growth Factor (NGF) synthesis in animal models; human trials show modest cognitive benefits in mild cognitive impairment. Typical dose: 500–1,000 mg standardised extract daily.
Niacin (B3): Proposed by Stamets to act as a "carrier" via vasodilation, shuttling NGF-stimulated neuroplasticity peripherally. Doses above 50–100 mg cause the characteristic niacin flush; doses above 500 mg risk hepatotoxicity — keep below 100 mg in a stacking context.
Magnesium glycinate: Supports GABA pathways, reduces muscle tension, and improves sleep quality. No known interaction with psilocybin. Dose: 200–400 mg elemental magnesium nightly.
Omega-3 fatty acids (EPA/DHA): Strong independent evidence for mood stabilisation and neuroinflammation reduction. Dose: 1–2 g combined EPA+DHA daily with food.

What NOT to Stack

SSRIs / SNRIs: Blunt or eliminate psilocybin effects by competing at 5-HT2A receptors. Do not abruptly discontinue psychiatric medications — consult a prescriber.
MAOIs: Dramatically potentiate psilocybin; serotonin syndrome risk. Contra-indicated without expert medical supervision.
St John's Wort: Mild MAOI and serotonin reuptake inhibitor; unpredictable interaction; avoid.
Stimulants (modafinil, amphetamines, high-dose caffeine): Cardiovascular strain and anxiety amplification on dosing days.
Lithium: Case reports of seizures when combined with psilocybin; contraindicated.

Stacking Protocols at a Glance

Stamets Stack

Psilocybin 0.1–0.3 g + Lion's Mane 500 mg + Niacin 50–100 mg. Schedule: 4 days on, 3 days off. Best suited to users seeking neuroplasticity support and cognitive enhancement. Avoid niacin above 100 mg.

Fadiman + Magnesium

Psilocybin 0.1–0.2 g every third day (Fadiman protocol) with 200–400 mg magnesium glycinate nightly. Focuses on mood regulation and sleep quality. Lower complexity; good starting point for beginners.

Minimal Stack

Psilocybin alone + Omega-3 daily (not dose-day specific). Minimises interaction variables. Recommended for those with a history of anxiety or who are new to supplementation.

Tracking Your Stack

Maintain a journal noting: date, substances and doses, mood on a 1–10 scale, energy, sleep quality, and any unusual symptoms. Review weekly. If anxiety, insomnia, or unusual emotional states appear, reduce the most recently introduced supplement first before adjusting psilocybin dose. Introduce one new supplement at a time, minimum two weeks apart, so you can attribute any change accurately.

FAQ

Do supplements increase psilocybin potency? Not directly — Lion's Mane and magnesium do not potentiate the psilocybin experience; they work on background neurophysiology. Niacin flush may make you more aware of subtle effects.
Is the Stamets Stack scientifically proven? The individual components have supporting research; the specific triple combination has not been formally studied in an RCT. Evidence is promising but preliminary.
Can I stack on macro-dose days? Reduce or skip supplements on full-dose days unless you have prior experience. Niacin flush can become uncomfortable at high psilocybin doses. Magnesium and Omega-3 are generally fine to continue.
What about adaptogens like ashwagandha or Rhodiola? Theoretical HPA-axis modulation may interact with serotonergic systems; the interaction data is minimal. Use with caution and start low if combining with microdosing.
How long should I run a stack? Most protocols run 4–8 weeks then a rest period of equal length. Extended continuous use risks tolerance and may reduce benefits over time.