What does Pyrroloquinoline Quinone (PQQ) do?

Antioxidant compound with early evidence for modest cognitive benefits in older adults. Research is still limited.

Is Pyrroloquinoline Quinone (PQQ) safe?

Most human trials are very small (20–64 participants), limiting confidence in the results

Pyrroloquinoline Quinone (PQQ) - Science-Based Research

What the Science Says

PQQ is a naturally occurring antioxidant compound found in small amounts in foods like fermented soybeans and green tea. It supports mitochondrial function — the energy-producing machinery inside cells — and has shown early promise for improving attention, working memory, and brain blood flow in middle-aged to elderly adults in small clinical trials. Studies used 20 mg per day for 12 weeks, with some cognitive improvements appearing by the end of that period.

What It Doesn't Do

Not proven to reverse dementia or Alzheimer's disease. No strong evidence it boosts athletic performance or builds muscle. Animal and lab results on eye health, bone density, lung protection, and fertility don't mean it works the same way in humans. Don't expect dramatic overnight results — the modest benefits seen in studies took weeks to appear.

Evidence-Based Benefits

PQQ is a naturally occurring antioxidant compound found in small amounts in foods like fermented soybeans and green tea. It supports mitochondrial function — the energy-producing machinery inside cells — and has shown early promise for improving attention, working memory, and brain blood flow in middle-aged to elderly adults in small clinical trials. Studies used 20 mg per day for 12 weeks, with some cognitive improvements appearing by the end of that period.

Weak Evidence

Effective at: 20 mg daily based on clinical studies

Source: auto-research

Absorption & Bioavailability

Unknown — no pharmacokinetic data provided in the available studies. Oral supplementation at 20 mg/day was used in human trials without absorption data reported.

Red Flags to Watch For

Most human trials are very small (20–64 participants), limiting confidence in the results
Some studies tested PQQ combined with other compounds (e.g., dihydrogen), making it impossible to isolate PQQ's specific effects
No systematic reviews or large-scale RCTs exist in the provided evidence base
Many exciting findings (bone health, lung protection, fertility, eye health) come from animal or cell studies only — not human trials
257 registered supplement products exist despite very limited clinical evidence — marketing often outpaces the science

Research Sources

PubMed
NIH DSLD