Browse the site

Start with a goal 40 things people take supplements for — sleep, stress, joints, focus.
Home Get the app
Pyrroloquinoline Quinone

Pyrroloquinoline Quinone

Best for

Remember more

Promising early signal 6–12 weeks 4 studies, n=161

  • 23 papers
  • 4 of 94 outcomes
  • 2 positive

Pyrroloquinoline quinone shows a promising early signal for memory and mental flexibility in healthy adults, while broader benefits across cognitive and mitochondrial outcomes remain unconfirmed.

Median effective dose, most-studied outcomes

  • Recall information across tasks 20 mg 6–12 wk
  • Support overall antioxidant capacity 0.1 mg/kg/day 2–6 wk
  • Strengthen antioxidant defenses 25 mg/kg 2–12 wk
Full protocol, 6 outcomes

Risk, worst reported severity

  • fatigue mild
  • dizziness mild
  • clozapine moderate
  • blood glucose lowering moderate
All 11 events and interactions

What pyrroloquinoline quinone actually does

Outcome Effect Evidence Dose Time Rank
Worth watching 2
Remember more Promising early signal Memory helps you hold onto information and bring it back when you need it.
moderate 		3 RCTs 4 papers · n=161 — 6–12 wk —
Strengthen executive control Promising early signal Executive control helps you plan, shift gears, and manage impulses when tasks get demanding.
moderate 		2 RCTs 2 papers · n=58 20–21.5 mg 12 wk #2 /23
Early research 2
Sharpen focus Not enough research Focus helps you stay with a task instead of being pulled away by distractions.
moderate 		2 RCTs 2 papers · n=99 20–21.5 mg 12 wk —
Think faster Not enough research Quick thinking helps information come together when time matters.
trivial 		2 RCTs 2 papers · n=58 20–21.5 mg 12 wk —

Effect tiers come from native-unit MCID where available, Cohen's d otherwise.

Protocol

Dose, timing & forms

How much

The cognitive studies with the clearest early signal used about 20 mg daily of oral PQQ for 6 to 12 weeks, covering memory, sustained attention, and planning tasks.2 The reviewed trials do not establish that more is better, and the much higher weight-based antioxidant protocols are not a sensible starting point for everyday cognitive use. Treat PQQ as a consistent, multi-week experiment rather than a fast-acting nootropic.12

When and how long

Cognitive outcomes were measured after daily use over weeks, so consistency matters more than chasing a particular hour of the day.2 Take it at a time you can repeat every day. If it feels activating for you, choose morning or early afternoon rather than taking it near bedtime, then reassess after the full trial window used in research.2

Forms & standardisation

Look for a product that clearly names the PQQ form and lists the amount per serving, rather than a proprietary blend that hides the dose. Human work has commonly used PQQ disodium salt, so that is the form with the most direct relevance to the available cognition research.2 Do not assume a label claim about mitochondrial support predicts better memory, since the human cognitive evidence is still limited.12

Studied range, by outcome

Outcome Studied range Median effective Duration Evidence
Recall information across tasks 20–21.5 mg 20 mg 6–12 wk 4 papers 8 sig. endpoints
Support overall antioxidant capacity 0.1 mg/kg/day 0.1 mg/kg/day 2–6 wk 4 papers 2 sig. endpoints
Strengthen antioxidant defenses 10–40 mg/kg 25 mg/kg 2–12 wk 3 papers 1 sig. endpoint
Hold focus through repetitive work 20–21.5 mg 20.75 mg 12 wk 2 papers 2 sig. endpoints
Plan tasks and adapt to change 20–21.5 mg 20 mg 12 wk 2 papers 6 sig. endpoints
Handle information faster 20–21.5 mg 20.75 mg 12 wk 2 papers 2 sig. endpoints

Adverse events and drug interactions

Safety events

fatigue mild
dizziness mild
urticaria mild
headache mild
loose stool mild
diarrhea mild
stomach discomfort mild
palpitation mild

Drug interactions

clozapine moderate additive
blood glucose lowering moderate unknown
lipid modifying agents moderate unknown
Buy well

Recommended Pyrroloquinoline Quinone products

Real products that dose Pyrroloquinoline Quinone where the research does, in a clean formulation, from brands we've audited. We only list ones we'd stand behind.

Chosen for adequate Pyrroloquinoline Quinone dosing vs. the studied range, a clean formulation (grade A–C), and independent brand-quality audits. Not sponsored.

In context

What this is and how it works

  • Memory and mental-flexibility outcomes were positive across 4 studies (n=161), spanning 12 endpoints.2
  • The review covered 23 papers and 94 outcomes, with promising or early evidence tiers only.
  • Evidence comes mainly from small, short-term studies in healthy adults, limiting certainty about wider populations.

Pyrroloquinoline quinone, or PQQ, is a vitamin-like redox compound found in trace amounts in foods such as fermented soybeans, parsley, and green tea. Supplement doses are far higher than food exposure, so the research asks a practical question: whether that extra amount changes how healthy adults think and function.

PQQ takes part in electron-moving chemistry and appears to signal cells to adjust their mitochondrial supply, like a building manager ordering more and better-maintained generators when demand rises.1 That cell-energy angle gives the memory findings a plausible biological story, but it does not turn the early cognitive trials into a guarantee.12

Bottom line

PQQ is worth watching if you want a measured, multi-week trial for memory or mental flexibility and you are comfortable with early-stage evidence. The cognitive signals are interesting, especially around memory, but the small number of studies means expectations should stay modest.2 Skip the hype, and be especially cautious if you use clozapine, blood-sugar medication, or lipid-lowering medication.

Frequently asked

Common questions

What does pyrroloquinoline quinone do?

Pyrroloquinoline quinone, usually called PQQ, participates in redox chemistry and appears to influence mitochondrial signaling, the cellular system that turns food and oxygen into usable energy.1 Small human trials also suggest a memory and executive-function signal, though the evidence remains early.2

Does PQQ improve memory?

Early human research suggests that daily PQQ supplementation improves performance across some memory tasks after several weeks, with a moderate-sized signal in the reviewed trials.2 That is promising, not proof that it will noticeably improve memory for everyone.

How long does PQQ take to work?

The cognitive trials tracked outcomes over roughly 6 to 12 weeks, not after a single dose.2 If you try it, judge it after consistent daily use rather than by how you feel on day one.

Is PQQ good for focus?

Two small studies suggest PQQ supports sustained attention and flexible thinking, but the evidence base is still too small to call it a reliable focus supplement.2 The observed processing-speed changes were trivial, so do not expect a dramatic mental boost.

Sources

Sources

  1. 1. Pyrroloquinoline quinone modulates mitochondrial quantity and function in mice and humans (2011) ↑
  2. 2. Effects of pyrroloquinoline quinone supplementation on cognitive function in healthy adults

Generated August 27, 2026

Related

More evidence for Pyrroloquinoline Quinone