Verdict: Not a performance aid for healthy people; may lower muscle damage markers, and has a separate role in heart failure under medical care
Safety: Generally well tolerated; may reduce the effect of warfarin; mild stomach upset possible
Key takeaways
Meta-analyses in healthy adults find CoQ10 raises blood levels but has small, inconsistent effects on exercise performance and no clear effect on VO2max
Several meta-analyses report lower muscle damage markers such as creatine kinase, but evidence quality is low
Heart-failure benefits from the Q-SYMBIO trial do not apply to healthy athletes, and results for statin muscle pain are conflicting
Coenzyme Q10 (CoQ10) has a strong sales pitch for anyone who cares about cardio: it sits at the heart of mitochondrial energy production. People search "CoQ10 exercise performance", "CoQ10 exercise recovery" and "CoQ10 before exercise" hoping for more stamina. The research says something more modest.
What it is
CoQ10 is a fat-soluble compound your body makes and that is found in meat, fish and nuts. It carries electrons in the mitochondrial energy chain and acts as an antioxidant in cell membranes. Levels fall with age and with statin use, and low heart-muscle levels are linked to the severity of heart failure. Supplements come as ubiquinone or ubiquinol.
Does it raise VO2max?
Not in healthy people. The biology is plausible, but VO2max is limited mainly by how much oxygen the heart and blood can deliver (see what limits VO2max), not by a shortage of CoQ10 in healthy muscle.
The largest recent review, by Deng and colleagues (British Journal of Nutrition, 2025), pooled 24 randomised trials in healthy adults. CoQ10 consistently raised blood CoQ10, but performance effects were "small and inconsistent". A small benefit from chronic use became unstable after removing outlier studies, and acute doses showed no benefit. Heterogeneity and moderate-to-high risk of bias lowered certainty. Talebi and colleagues (Clinical Nutrition ESPEN, 2024) pooled 28 trials (830 participants), focusing mainly on muscle damage and oxidative stress markers rather than performance.
Does it improve endurance performance?
Not meaningfully for healthy, well-fed exercisers. Endurance gains in the Deng review were borderline once outliers were excluded, and benefits in trained people were unstable. A narrative review by Drobnic and colleagues (Nutrients, 2022) was more upbeat but described the data as inconclusive.
Recovery is where the signal is more consistent. Talebi and colleagues found CoQ10 lowered creatine kinase, lactate dehydrogenase, myoglobin and malondialdehyde, which are markers of muscle damage and oxidative stress. Lower markers are not the same as faster real-world recovery, and there is a catch: some oxidative stress during training is part of the signal that drives adaptation, as discussed in our piece on cold plunges.
Why the hype outruns the data
CoQ10 is a classic case of a sound mechanism that does not translate into results. Healthy people make enough of it, and raising blood levels does not seem to push more oxygen through muscle. Many trials are small, short and use different doses and forms, and outcomes range from lab biomarkers to sprint tests, which makes positive findings easy to cherry-pick. Deficiency is uncommon outside rare genetic conditions, older age, some medications and certain diseases.
How it is used in studies
Most exercise trials used about 100–300 mg a day for several weeks. Single pre-exercise doses have not shown benefits, so "CoQ10 before exercise" is not supported. CoQ10 is fat-soluble and is usually taken with a meal.
Side effects, safety and anti-doping
CoQ10 is generally well tolerated. Mild stomach upset, nausea and insomnia have been reported. Key cautions:
- Warfarin. CoQ10 is structurally similar to vitamin K and may reduce warfarin's effect.
- Blood pressure and diabetes medication. It may slightly lower blood pressure and blood sugar.
- Product quality. Content and absorption vary between brands and forms.
Heart failure is a different population. In the Q-SYMBIO trial (Mortensen et al., JACC Heart Failure, 2014), 420 patients with moderate to severe heart failure took 100 mg three times daily or placebo alongside standard care. Short- term outcomes did not change, but after 2 years major cardiovascular events occurred in 15% versus 26% (hazard ratio 0.50). This is a single trial in sick patients, it says nothing about athletes, and CoQ10 should only be used there as part of medical care.
Statin users often take CoQ10 for muscle aches. Evidence conflicts: one meta-analysis (Qu et al., 2018) found less muscle pain, while another (Kennedy et al., 2020) found no benefit for myalgia or for staying on statins. Never stop a statin without talking to your doctor.
CoQ10 is not prohibited by WADA, but if you compete use a third-party tested product (for example, Informed Sport or NSF Certified for Sport).
This page is not medical advice. Talk to a doctor before taking CoQ10 if you have a heart condition, are pregnant, or take medication, especially warfarin, statins or blood pressure drugs.
Who might benefit
People with heart failure under medical supervision, and possibly some statin users with muscle symptoms, after a conversation with their doctor. Healthy athletes chasing VO2max or performance are unlikely to notice a difference.
Bottom line
CoQ10 raises blood levels reliably but does little for VO2max or performance in healthy people. It may lower muscle-damage markers, with low-quality evidence. Your money is better spent on proven aids such as caffeine or creatine, and your time on training: see how to improve VO2max. Browse all supplements or track progress with the VO2max calculator.
Frequently asked questions
Does CoQ10 improve exercise performance?
In healthy people, not much. A 2025 meta-analysis of 24 trials found CoQ10 reliably raised blood levels but had at most modest, inconsistent effects on performance, mostly after weeks of use.
Does CoQ10 help exercise recovery?
It may lower blood markers of muscle damage such as creatine kinase, according to several meta-analyses, but the evidence is low quality and it is unclear whether you actually recover faster.
Should I take CoQ10 before exercise?
There is little reason to. Single doses before exercise showed no benefit in a 2025 meta-analysis, and any effects seen in trials came from daily use over weeks.
Does CoQ10 help with statin muscle pain?
Results conflict. Some meta-analyses found less muscle pain with CoQ10, while others found no benefit, so discuss it with your doctor rather than stopping or changing your statin.
Sources
- Deng H, Song T, Yin M, et al. Coenzyme Q10 supplementation increases blood concentrations but shows limited and inconsistent effects on exercise performance: a systematic review and meta-analysis. Br J Nutr. 2025:1–21.
- Talebi S, Pourgharib Shahi MH, Zeraattalab-Motlagh S, et al. The effects of coenzyme Q10 supplementation on biomarkers of exercise-induced muscle damage, physical performance, and oxidative stress: a GRADE-assessed systematic review and dose-response meta-analysis of randomized controlled trials. Clin Nutr ESPEN. 2024;60:122–134.
- Drobnic F, Lizarraga MA, Caballero-García A, Cordova A. Coenzyme Q10 supplementation and its impact on exercise and sport performance in humans: a recovery or a performance-enhancing molecule? Nutrients. 2022;14(9):1811.
- Mortensen SA, Rosenfeldt F, Kumar A, et al. The effect of coenzyme Q10 on morbidity and mortality in chronic heart failure: results from Q-SYMBIO, a randomized double-blind trial. JACC Heart Fail. 2014;2(6):641–649.
- Qu H, Guo M, Chai H, et al. Effects of coenzyme Q10 on statin-induced myopathy: an updated meta-analysis of randomized controlled trials. J Am Heart Assoc. 2018;7(19):e009835.
- Kennedy C, Köller Y, Surkova E. Effect of coenzyme Q10 on statin-associated myalgia and adherence to statin therapy: a systematic review and meta-analysis. Atherosclerosis. 2020;299:1–8.