PQQ vs. CoQ10: Which Has Better Evidence for Memory?

A supplement can raise the amount of a nutrient in your blood without producing a measurable improvement in memory. A 2026 clinical trial of ubiquinol, a form of CoQ10, made that distinction especially clear: blood CoQ10 levels rose substantially, but overall cognitive test scores were not better than placebo.

So where does PQQ fit? Both ingredients appear in conversations about mitochondrial health and brain energy, yet they do different jobs in the cell—and their cognitive research tells different stories. Here's what matters if you're comparing PQQ vs. CoQ10 for memory, focus, or everyday mental performance.

PQQ vs. CoQ10: the differences at a glance

Why mitochondria matter to your brain

Your brain uses a great deal of energy to maintain communication between neurons. Mitochondria help make ATP, the molecule cells use to power much of that work. That makes mitochondrial function an important area of brain-health research—but it does not mean every ingredient that affects mitochondria will improve memory in a person.

This distinction is where many supplement comparisons go wrong. Cellular mechanisms tell us why an idea is worth studying. Randomized human studies help tell us whether that idea produces a meaningful benefit. For a deeper explanation of the biology, see why brain energy changes with age.

What does CoQ10 actually do?

CoQ10 is a molecule the body makes naturally. Inside mitochondria, it helps shuttle electrons through the energy-production system, a necessary step toward generating ATP. In its reduced form, known as ubiquinol, it also participates in antioxidant defense. These roles are well established in biochemistry, as explained by Oregon State University's Linus Pauling Institute.

But being essential to normal cellular energy production is not the same as showing that taking more CoQ10 improves thinking. The body already produces CoQ10, and raising its level through supplementation does not automatically translate into a measurable cognitive benefit.

What a newer CoQ10 study found

In a randomized trial published in June 2026, researchers enrolled 111 adults aged 60 and older to test 200 mg of ubiquinol daily or placebo for 90 days. Blood CoQ10 levels were roughly four times those in the placebo group at the end of the study. Yet the groups did not differ meaningfully on the study's overall measures of memory or processing time.

The investigators did find that, within the ubiquinol group, larger increases in blood CoQ10 were associated with better memory scores. That's an interesting exploratory finding, but an association within one group cannot overturn the main placebo-controlled result. The authors called for further research.

A 2025 review of CoQ10 and cognition reached a similarly measured conclusion: human studies have yielded mixed outcomes, including benefits in some groups and no improvement in others. The evidence does not justify treating CoQ10 as a proven memory supplement for healthy adults.

What makes PQQ different?

PQQ is not a substitute for CoQ10 in the mitochondrial electron-transport chain. Instead, researchers are investigating PQQ's antioxidant properties and its influence on cell-signaling pathways related to mitochondrial health. Laboratory and animal experiments have linked PQQ to mitochondrial biogenesis—the processes involved in making additional mitochondria—but that should not be presented as proof that a PQQ capsule creates new mitochondria in the human brain. A research review of PQQ's mechanisms explains the distinction between these experimental findings and human evidence.

What the human memory research shows

A 2023 double-blind, placebo-controlled PQQ study tested 20 mg per day for 12 weeks in adults aged 20 to 65. Researchers reported improvements in composite and verbal memory measures after 12 weeks. In age-based analyses, younger participants showed improvements in certain speed and flexibility measures at eight weeks, while older participants showed improvements in complex and verbal memory measures at 12 weeks.

Those results are worth attention. They are also early findings from a relatively small trial, with several authors affiliated with a PQQ manufacturer. Independent replication and larger studies would help clarify how reliably the results apply beyond the study population.

If you want a more detailed look at that ingredient alone, we've covered what PQQ does for the brain. The more useful comparison here is that the PQQ and CoQ10 trials examined different people, interventions, and cognitive outcomes. You cannot rank the ingredients definitively by putting the results of separate studies side by side.

Would taking PQQ and CoQ10 together work better?

Possibly, but the word synergy gets ahead of the evidence. Some smaller trials have examined PQQ alone, PQQ combined with CoQ10, and placebo. A 2024 research review summarizes reports of improvement on certain cognitive measures with combined supplementation.

These studies provide a reason to investigate the combination. They do not show that everyone should take both ingredients, nor do they settle whether adding CoQ10 produces a consistent advantage over PQQ alone. Study size, testing methods, and the lack of a CoQ10-only group in some comparisons limit what can be concluded.

How should you compare brain-energy supplements?

Rather than looking for a single winner, ask four practical questions:

• Was the outcome measured in people? Cell and animal findings are useful starting points, not substitutes for human cognition tests.
• Was there a placebo group? A before-and-after improvement does not necessarily mean the supplement caused it.
• Was the exact ingredient and dose studied? A result for ubiquinol cannot automatically be applied to every CoQ10 product, and evidence for a PQQ ingredient does not validate every multi-ingredient formula.
• What actually improved? Blood nutrient levels, antioxidant markers, attention tests, and everyday memory are different outcomes.

Also consider safety and medications. The National Center for Complementary and Integrative Health notes that CoQ10 may interact with warfarin and insulin. Human long-term safety information for PQQ is more limited. Check with a qualified clinician before starting supplements, especially if you take medications, are pregnant or breastfeeding, or have a medical condition.

Why Sharper Memory includes PQQ

BEACON40's Sharper Memory formula includes 20 mg of PQQ per serving—the same amount used in the 2023 human PQQ study—alongside other ingredients selected for different aspects of healthy cognitive function. It does not include CoQ10.

That choice reflects a formulation approach, not proof that PQQ beats CoQ10. The study examined PQQ as an ingredient; it was not a clinical trial of Sharper Memory as a finished formula. If you're evaluating a daily brain-support routine, the useful next step is to review the full ingredient list, doses, and research behind each component rather than comparing two names on a label.

Explore the Sharper Memory formula and its ingredients →

Frequently asked questions

Is PQQ better than CoQ10 for memory?

There is no strong direct human evidence establishing PQQ as universally superior to CoQ10 for memory. Their functions differ, the study populations differ, and both evidence bases need further research.

Does CoQ10 help brain fog?

CoQ10 is involved in normal cellular energy production, but evidence that taking it improves brain fog or cognition in otherwise healthy adults remains inconsistent. Persistent brain fog can have many causes worth discussing with a healthcare professional.

Can you take PQQ and CoQ10 together?

They have been studied together in small human trials, but that does not establish the combination as necessary or effective for everyone. Review medication interactions and individual circumstances with your clinician.

How long was PQQ studied for memory?

In the 2023 randomized trial discussed above, PQQ was studied at 20 mg daily for 12 weeks. The results describe that study; they should not be treated as a guaranteed timeline for individual results.

Educational content only. Dietary supplements are not intended to diagnose, treat, cure, or prevent any disease. Individual results vary.