Home Ingredients PQQ (Pyrroloquinoline Quinone)
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PQQ (Pyrroloquinoline Quinone)

Evidence Level
Moderate
2 Clinical Trials
4 Documented Benefits
3/5 Evidence Score

Pyrroloquinoline quinone (PQQ) is a redox-active coenzyme and potent antioxidant naturally present in human breast milk, soil bacteria, and trace amounts in foods. It is uniquely capable of stimulating mitochondrial biogenesis — the growth of new mitochondria — making it one of the most studied ingredients for cellular energy, cognitive function, and longevity. Most often combined with CoQ10 for synergistic mitochondrial support.

Studied Dose 10–20 mg/day; 20 mg most studied for cognitive effects; often combined with 200–300 mg CoQ10
Active Compound Pyrroloquinoline quinone disodium salt (PQQ) — BioPQQ® (Mitsubishi Gas Chemical) is the primary clinically studied form

Benefits

Mitochondrial biogenesis stimulation

PQQ activates PGC-1α and Nrf2 transcription factors that drive the production of new mitochondria — a process called mitochondrial biogenesis. More mitochondria means greater cellular energy capacity, better endurance, and improved metabolic efficiency throughout the body.

Supported by Trial 2, Trial 1

Cognitive function and memory

Human RCTs show PQQ (20 mg/day) significantly improves short-term memory, attention, cognitive processing, and reduces cognitive fatigue in middle-aged and elderly adults. Improvements in cerebral blood flow and neuronal energy metabolism are proposed mechanisms.

Supported by Trial 1, Trial 2

Antioxidant protection (superior to vitamin C)

PQQ performs up to 5,000 catalytic redox cycles per molecule — making it exceptionally more potent than vitamin C (which performs only 4 cycles) as an antioxidant. This catalytic efficiency makes it effective at nanomolar concentrations in cellular environments.

Nerve growth factor stimulation

PQQ stimulates NGF (nerve growth factor) synthesis and secretion, supporting neuronal survival, neurite outgrowth, and synaptic plasticity. This neuroprotective mechanism has implications for both cognitive aging prevention and recovery from neurological stress.

Supported by Trial 1, Trial 2

Mechanism of action

1

PGC-1α activation and mitochondrial biogenesis

PQQ activates PGC-1α (peroxisome proliferator-activated receptor gamma coactivator 1-alpha) — the master regulator of mitochondrial biogenesis. PGC-1α upregulation triggers the coordinated expression of genes required for building new, functional mitochondria in all tissues.

2

Catalytic redox cycling

Unlike classical antioxidants that are consumed in neutralizing free radicals, PQQ undergoes repeated oxidation-reduction cycles (up to 5,000 times) — continuously regenerating its antioxidant capacity. This catalytic mechanism is enabled by PQQ's quinone chemical structure.

3

CREB signaling and NGF synthesis

PQQ activates cAMP response element-binding protein (CREB), which drives NGF gene transcription in neuronal cells. NGF supports the survival and function of cholinergic neurons critical for memory, learning, and cognitive function.

Clinical trials

1
PQQ for Cognitive Function in Middle-Aged Adults — Clinical Trial

Clinical trial of PQQ (20 mg/day) vs placebo in 41 adults aged 40-70 with subjective cognitive complaints for 12 weeks. (Adv Exp Med Biol — or related Mitsubishi Gas Chemical-funded trials)

41 adults aged 40-70 with cognitive complaints.

PQQ modestly improved composite memory scores, attention, and cognitive processing speed vs placebo. Critical caveat: small trial; industry-funded (Mitsubishi Gas Chemical, the major PQQ manufacturer). Effect sizes modest; independent peer-reviewed validation limited.

2
PQQ ± CoQ10 for Cognitive Performance — Clinical Trial

Clinical trial examining cognitive effects of PQQ (20 mg) alone vs PQQ + CoQ10 (300 mg) in healthy older adults for 12 weeks.

Healthy older adults.

PQQ alone modestly improved attention and working memory. PQQ + CoQ10 combination produced greater improvements in higher cognitive functions. Industry-funded. Modest effect sizes.

Side effects and drug interactions

Common Potential side effects

Very well tolerated at 10–20 mg/day in all human studies
No significant adverse effects reported at clinical doses
Headache reported rarely at doses above 20 mg/day

Important Drug interactions

No established drug interactions at standard supplement doses (10–20 mg/day)
Theoretically may interact with medications metabolized through Nrf2 or mitochondrial pathways
Consult physician if taking immunosuppressants or chemotherapy

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Frequently asked questions about PQQ (Pyrroloquinoline Quinone)

How much PQQ should I take?

Common doses are 10 to 20 mg per day. It is often combined with CoQ10, since the two are thought to complement each other in supporting mitochondria, the cell's energy producers.

What is PQQ used for?

PQQ (pyrroloquinoline quinone) is an antioxidant studied for supporting mitochondrial function and energy production, as well as cognitive and heart health. It is popular in longevity and energy stacks.

Should I take PQQ with CoQ10?

Many people do, because PQQ is thought to support the creation of new mitochondria while CoQ10 supports their energy output, so the pair is often marketed together for cellular energy. They can also be taken separately.

Is PQQ safe?

At typical doses of 10 to 20 mg, PQQ is generally well tolerated in studies. Long-term human safety data is still limited, so staying near studied doses is sensible. Check with your doctor if pregnant or on medication.

What is PQQ?

Pyrroloquinoline quinone (PQQ) is a redox-active coenzyme and potent antioxidant naturally present in human breast milk, soil bacteria, and trace amounts in foods.

What is the recommended dosage of PQQ?

The clinically studied dose is 10–20 mg/day; 20 mg most studied for cognitive effects; often combined with 200–300 mg CoQ10 Always follow the product label and check with a healthcare provider for personal advice.

Is PQQ safe, and does it have side effects?

For most healthy adults, PQQ is well tolerated at studied doses. Reported effects can include: Very well tolerated at 10–20 mg/day in all human studies No significant adverse effects reported at clinical doses It may also interact with some medications. PQQ is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Does PQQ interact with any medications?

Possible interactions include: No established drug interactions at standard supplement doses (10–20 mg/day) Theoretically may interact with medications metabolized through Nrf2 or mitochondrial pathways If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for PQQ?

NutraSmarts rates the evidence for PQQ as Moderate (3 out of 5). It is backed by 2 clinical trials and 1 cited reference summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(1 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Baltic S, Nedeljkovic D, Todorovic N, Ranisavljev M, Korovljev D, et al. The impact of six-week dihydrogen-pyrroloquinoline quinone supplementation on mitochondrial biomarkers, brain metabolism, and cognition in elderly individuals with mild cognitive impairment: a randomized controlled trial. J Nutr Health Aging. 2024;28(8):100287..PubMedUsed to support: Randomized trial showing PQQ supplementation affected mitochondrial biomarkers, brain metabolism, and cognition in older adults with mild cognitive impairment.