Stack

What is a stack?

In the microdosing context, a stack refers to a deliberate combination of substances taken alongside a psychedelic microdose to enhance, complement, or modulate its effects. The concept is borrowed from the nootropics community, where "stacking" supplements is a common practice.

The most well-known microdosing stack is the Stamets Stack, proposed by mycologist Paul Stamets:

• Psilocybin (microdose) — the primary psychoactive compound
• Lion's mane mushroom — a non-psychoactive medicinal mushroom studied for its neuroprotective and neurogenesis-promoting properties
• Niacin (vitamin B3) — a vasodilator theorized to help distribute the other compounds throughout the body, particularly to peripheral nerves

Other common stack components include:

• Cacao — contains theobromine and MAO inhibitors that may mildly potentiate psychedelic effects
• Adaptogenic mushrooms (reishi, chaga, cordyceps) — general health and stress support
• Omega-3 fatty acids — supporting brain health and neuroplasticity
• Magnesium — may reduce physical tension sometimes associated with psychedelics

Why it matters for microdosing

Stacking is popular because it offers the potential to:

• Enhance neuroplasticity — combining multiple neuroplasticity-promoting compounds may create synergistic effects
• Support brain health — medicinal mushrooms like lion's mane have independent cognitive benefits
• Personalize the protocol — stacking allows individual customization based on specific goals
• Address multiple targets — different compounds work through different mechanisms, potentially broadening benefits

How it works in practice

Stamets Stack protocol:

1. Days 1–4: Psilocybin (100 mg) + Lion's mane (200–500 mg) + Niacin (50–100 mg)
2. Days 5–7: Off-days (some continue lion's mane on off-days)
3. Repeat for 4 weeks, then take 2–4 weeks off

Building your own stack:

1. Start with the microdose alone — establish your baseline response before adding components
2. Add one component at a time — this way you can identify what each addition does
3. Research each component — understand mechanisms, dosages, and potential interactions
4. Track everything — your dose log should record all stack components

What to watch out for

• Complexity creep — more compounds = more variables = harder to know what's actually working
• Niacin flush — niacin causes a temporary skin flush (redness, warmth, tingling) that some find uncomfortable; start with a low dose
• Unproven synergies — while the theoretical basis is interesting, most stacking protocols lack rigorous clinical evidence
• Interaction risk — every additional substance is a potential interaction; research each combination
• Marketing influence — some stacking recommendations are driven by supplement sales rather than evidence