PQQ (pyrroloquinoline quinone) and CoQ10 (coenzyme Q10) are two distinct compounds that show up together in many supplement formulas because they affect mitochondria through different but complementary routes. PQQ promotes the creation of new mitochondria, while CoQ10 helps existing mitochondria produce energy more efficiently. A small but growing body of research suggests that combining them may amplify effects that neither achieves as well on its own, particularly for cognitive function.
What PQQ Actually Is
PQQ is a small molecule classified as a redox cofactor, meaning it can shuttle electrons back and forth in chemical reactions. It was first identified in bacteria in the 1960s, and researchers later discovered it in trace amounts in human tissues and a wide range of foods, from fermented soybeans (natto) to green tea, kiwi, and parsley. Your body does not synthesize PQQ in meaningful quantities, so whatever you have comes from your diet or supplements.
The feature that sets PQQ apart from most antioxidants is its ability to stimulate mitochondrial biogenesis, the process by which cells build entirely new mitochondria. It does this through a signaling cascade involving two proteins: SIRT1 (a protein deacetylase) and PGC-1α (a master regulator of mitochondrial production). In cell studies, PQQ treatment increased cellular NAD+ levels, which in turn activated SIRT1. The activated SIRT1 then deacetylated PGC-1α, switching it on and driving the expression of genes involved in building mitochondria.1PubMed. Pyrroloquinoline Quinone, a Redox-Active o-Quinone, Stimulates Mitochondrial Biogenesis by Activating the SIRT1/PGC-1α Signaling Pathway When researchers blocked SIRT1 with a selective inhibitor, PQQ lost its ability to trigger this mitochondrial growth, confirming that the SIRT1 pathway is central to how it works.
A separate study using auditory hair cells found similar results. When the cells were stressed with hydrogen peroxide to simulate premature aging, SIRT1 and PGC-1α levels dropped significantly. Pretreating the cells with PQQ rescued those protein levels and preserved mitochondrial function under oxidative stress.2npj Aging. Pyrroloquinoline quinone (PQQ) protects mitochondrial function of HEI-OC1 cells under premature senescence In other words, PQQ appears to both build new mitochondria and protect existing ones when cells are under duress.
PQQ also has potential effects beyond mitochondria. It may activate AMP-activated protein kinase (AMPk), a cellular energy sensor involved in glucose and fat metabolism.3Nutrafoods. Pyrroloquinoline quinone (PQQ): the next essential nutrient and supplement superstar And early research found that PQQ enhances production of nerve growth factor (NGF), a protein critical for maintaining and repairing neurons.4PubMed. Stimulation of nerve growth factor production by pyrroloquinoline quinone and its derivatives in vitro and in vivo
What CoQ10 Does Inside Your Cells
CoQ10 is a fat-soluble molecule found in virtually every cell of your body, with the highest concentrations in organs that demand the most energy: the heart, liver, kidneys, and brain. Its primary job is acting as an electron carrier in the mitochondrial respiratory chain, the sequence of reactions that converts food into the ATP your cells use as fuel.5PubMed Central. The Roles of Coenzyme Q in Disease: Direct and Indirect Involvement in Cellular Functions Without adequate CoQ10, the energy production line slows down.
CoQ10 sits at a critical junction in this chain, receiving electrons from multiple metabolic pathways and passing them along to the next complex in the sequence.6PubMed. Coenzyme Q biosynthesis and its role in the respiratory chain structure Think of it as a shuttle bus that picks up passengers (electrons) from several stops and delivers them to a single destination where ATP gets made. When CoQ10 levels drop, such as in cells with CoQ10 deficiency, supplementation can partially restore the activity of those electron-transport complexes, though not always completely.7PubMed. Effect of Coenzyme Q10 supplementation on mitochondrial electron transport chain activity and mitochondrial oxidative stress in Coenzyme Q10 deficient human neuronal cells
Beyond energy production, CoQ10 doubles as an antioxidant. It can directly scavenge reactive oxygen species and also regenerate other antioxidants like vitamins C and E, extending their protective activity.8Biology of Reproduction. A role for the antioxidants coenzyme Q10 and pyrroloquinoline quinone in mitigating obesity-associated reproductive dysfunction Your body produces CoQ10 on its own, but production declines with age, which is one reason the supplement became popular in the first place. Dietary sources include meat, fish, nuts, and certain oils, though the average diet provides only about 3 to 6 mg per day, far below the doses used in clinical studies.9Taylor & Francis Online (Crit Rev Food Sci Nutr). Coenzyme Q10 contents in foods and fortification strategies
Why They Get Paired Together
The logic behind combining PQQ and CoQ10 boils down to a division of labor. PQQ signals cells to build more mitochondria. CoQ10 helps those mitochondria, both old and new, produce energy efficiently. One analogy: PQQ is like building more power plants, while CoQ10 is like supplying each plant with higher-quality fuel. Neither step fully replaces the other.
A review on reproductive health framed the relationship directly, noting that by promoting mitochondrial biogenesis and enhancing mitochondrial efficiency, the combination of CoQ10 and PQQ may improve cellular energy production and exert synergistic benefits.8Biology of Reproduction. A role for the antioxidants coenzyme Q10 and pyrroloquinoline quinone in mitigating obesity-associated reproductive dysfunction The word “synergistic” here refers to a combined effect that is greater than each ingredient alone, though rigorous head-to-head comparisons in large human trials are still limited.
Both compounds also function as antioxidants, but they operate in different cellular compartments and through different mechanisms. CoQ10, being fat-soluble, embeds in cell membranes and the inner mitochondrial membrane, where it neutralizes lipid-damaging free radicals. PQQ, which is water-soluble, acts in a wider range of cellular environments. Having both on hand broadens the range of oxidative threats a cell can handle.
The Cognitive Evidence
One area where the PQQ-CoQ10 pairing has been specifically tested in humans is brain function. A study examining PQQ disodium salt found that it improved aspects of cognitive flexibility and executive speed in younger adults over an eight-week period. When CoQ10 was co-administered with PQQ, these cognitive effects were further enhanced.10The Journal of Medical Investigation. The effects of pyrroloquinoline quinone disodium salt on brain function and physiological processes The finding is notable because it is one of the few human trials directly comparing PQQ alone against PQQ plus CoQ10, lending concrete support to the idea that the combination performs better for at least some outcomes.
The mechanisms behind these cognitive improvements likely reflect the complementary biology already described. The brain is one of the most energy-hungry organs in the body, consuming roughly a fifth of your total energy at rest. PQQ’s ability to encourage new mitochondria and stimulate nerve growth factor production could support neuronal health and plasticity, while CoQ10’s role in keeping the energy supply running gives those neurons the ATP they need to function. Both compounds also reduce oxidative stress, which accumulates in brain tissue with age and contributes to cognitive decline.
Heart Health and CoQ10’s Stronger Track Record
When it comes to cardiovascular benefits, CoQ10 has a substantially deeper evidence base than PQQ. Supplementation with CoQ10 has been shown to reduce oxidative stress and mortality from cardiovascular causes, improve outcomes in patients undergoing coronary artery bypass surgery, prevent the accumulation of oxidized LDL in arteries, reduce vascular stiffness and hypertension, and improve blood vessel function by lowering reactive oxygen species and increasing nitric oxide for vasodilation.11PubMed Central. The Use of Coenzyme Q10 in Cardiovascular Diseases These findings come from a body of clinical research built over decades.
PQQ’s role in heart health is far less established. Its antioxidant and mitochondrial-support properties are theoretically relevant to the cardiovascular system, since the heart muscle is packed with mitochondria and constantly subjected to oxidative stress. But there is not yet a comparable body of human cardiovascular data for PQQ. If you are considering the PQQ-CoQ10 pairing specifically for heart health, the honest assessment is that CoQ10 is doing the heavy lifting based on current evidence, and PQQ is a plausible but unproven addition.
Skin and Aging Applications
The skin is another area where both compounds show up in product marketing and where the underlying biology makes at least a theoretical case for their use. Skin aging is driven in part by declining mitochondrial function in skin cells. PQQ has been reported to stimulate mitochondrial biosynthesis and protect mitochondrial DNA from oxidative damage, and it can promote mitochondrial DNA repair and functional recovery by increasing NAD+ levels.12Oxford Academic. Mitochondrial dynamics in skin health and disease: energy, aging, and therapeutic perspectives
CoQ10, meanwhile, already has a long history in topical skincare formulas, where its antioxidant properties help neutralize free radicals generated by UV exposure. In a supplement context, the thinking is that providing both PQQ and CoQ10 could support skin cell energy from the inside. A study on a multi-ingredient antioxidant supplement containing both compounds (among others) found upregulation of genes associated with antioxidant defense and anti-inflammatory signaling in human epithelial cells, including FOXO3A and the antioxidant enzyme GPX1.13PubMed Central. Effects of Kiperin Elixea, a multicomponent antioxidant supplement, on redox homeostasis and longevity-associated gene expression in human epithelial cell models The caveat is that this was a multi-ingredient formula, so attributing the results to PQQ and CoQ10 specifically is impossible from that study alone.
Choosing a Supplement Form
CoQ10 comes in two chemical forms: ubiquinone (the oxidized version) and ubiquinol (the reduced version). The distinction matters because ubiquinol has higher biological absorption and better therapeutic effect compared to ubiquinone.14PubMed Central. The Cocrystal of Ubiquinol: Improved Stability and Bioavailability However, an interesting twist emerged in bioavailability research: regardless of which form you swallow, CoQ10 appears in the blood mostly as ubiquinol. In one study comparing three formulations of 100 mg CoQ10 in older adults, a water-soluble ubiquinone syrup achieved about 2.4-fold higher absorption than standard ubiquinone capsules, while ubiquinol capsules showed a non-significant 1.7-fold improvement.15PubMed Central. Comparative Bioavailability of Different Coenzyme Q10 Formulations in Healthy Elderly Individuals This suggests that the delivery vehicle and formulation technology may matter more than whether the CoQ10 starts out as ubiquinone or ubiquinol.
CoQ10 is fat-soluble, so taking it with a meal containing some fat generally improves absorption.16PubMed Central. Bioavailability of Coenzyme Q10: An Overview of the Absorption Process and Subsequent Metabolism PQQ, being water-soluble, does not have the same requirement. In supplements, PQQ typically appears as pyrroloquinoline quinone disodium salt, the form used in most research. Common doses in studies range from 10 to 20 mg per day for PQQ and 100 to 300 mg per day for CoQ10, though products vary widely.
Safety and Regulatory Standing
CoQ10 has a long safety record at commonly used doses. It is well tolerated in most people, with occasional mild gastrointestinal side effects being the most commonly reported issue. One area worth noting: because CoQ10 has a chemical structure similar to vitamin K, there has been speculation about interactions with blood-thinning medications like warfarin. If you take anticoagulants, it is worth discussing CoQ10 with your prescriber.
PQQ was assessed by the European Food Safety Authority (EFSA) as a novel food. The form evaluated, BioPQQ, is produced by bacterial fermentation using Hyphomicrobium denitrificans and has a minimum purity of 99.0%.17PubMed Central. Safety of pyrroloquinoline quinone disodium salt as a novel food pursuant to Regulation (EC) No 258/97 EFSA’s safety evaluation cleared it for use, which helped pave the way for PQQ’s inclusion in supplements sold in Europe and elsewhere. In the United States, PQQ has self-affirmed GRAS (Generally Recognized As Safe) status, meaning the manufacturer submitted safety data and concluded it met the threshold, though the FDA does not independently certify GRAS determinations in the same way EFSA conducts its reviews.
Neither PQQ nor CoQ10 is a pharmaceutical, and neither is regulated with the same rigor as prescription drugs. Supplement quality can vary between manufacturers, so third-party testing certifications (NSF, USP, or ConsumerLab) are a reasonable way to verify that what is on the label matches what is in the capsule.
Where the Evidence Is Thin
The science on PQQ alone is still young compared to CoQ10, which has been studied for decades. Much of the PQQ data comes from cell-culture experiments and animal models, with only a handful of human trials published. The cognitive study showing that PQQ plus CoQ10 outperformed PQQ alone is encouraging, but it is a relatively small body of work on which to build confident clinical recommendations.
For the combination specifically, the gap is even wider. Most supplement formulas containing both ingredients base their marketing on the theoretical rationale (new mitochondria plus better-functioning mitochondria) and the handful of studies showing co-administration effects. Large, long-duration randomized controlled trials comparing PQQ alone, CoQ10 alone, the combination, and a placebo across meaningful clinical endpoints like cardiovascular events, dementia incidence, or all-cause mortality simply do not exist yet.
That does not mean the combination is useless. The biological rationale is coherent, the individual compounds each have evidence supporting their primary mechanisms, and the limited human data that does exist points in a positive direction. But anyone expecting the kind of ironclad clinical evidence that exists for, say, statin therapy or blood-pressure medication will be disappointed. PQQ-CoQ10 supplements sit in the large gray zone of nutritional science where mechanisms are promising, early results are favorable, and definitive proof remains a few large trials away.
PQQ in Foods Versus Supplements
PQQ occurs naturally in a range of plant and fermented foods, though the concentrations are tiny, measured in nanograms per gram of food. Natto, green tea, green peppers, kiwi, papaya, and parsley are among the richer dietary sources. However, even a diet loaded with these foods would deliver PQQ in microgram quantities, orders of magnitude below the milligram doses used in research. This is why supplementation is the only practical way to reach the levels associated with biological effects in studies.
CoQ10’s dietary situation is similar in spirit. Organ meats, sardines, mackerel, peanuts, and soybean oil contain meaningful amounts, but as mentioned earlier, total dietary intake typically lands around 3 to 6 mg per day.9Taylor & Francis Online (Crit Rev Food Sci Nutr). Coenzyme Q10 contents in foods and fortification strategies Supplement doses generally start at 100 mg, so food alone is not a substitute for supplementation if you are trying to reach therapeutic levels. The dietary sources still matter for general nutritional health, but the gap between food intake and study doses is too large to bridge with diet alone for either compound.