Coenzyme Q10 for Athletes: Performance Evidence
Coenzyme Q10 (CoQ10, also known as ubiquinone) is a fat-soluble compound that is an essential component of the mitochondrial electron transport chain. It participates in the production of adenosine triphosphate (ATP) — the body's primary energy currency. For athletes the natural question is: does CoQ10 supplementation improve energy production capacity and performance?
Mechanism in Sport
CoQ10 sits on the inner mitochondrial membrane, where it acts as an electron carrier between Complexes I, II, and III in the electron transport chain. Without adequate CoQ10, ATP production efficiency decreases. CoQ10 is also an important antioxidant protecting mitochondria from free radicals generated during exercise.
CoQ10 levels in the body decline with age — this is partly why older athletes may derive greater benefit from supplementation.
Strength and Endurance Evidence
A systematic review (Sanoobar et al., 2016) evaluated CoQ10 effects on physical performance across multiple randomised trials. The authors found that CoQ10 supplementation improved maximal oxygen uptake (VO2 max) and reduced fatigue markers in endurance athletes (Sanoobar et al., 2016).
For strength sports, evidence is more modest. One double-blind trial found that 8 weeks of CoQ10 supplementation improved muscle work efficiency during endurance exercise compared with placebo (Cooke et al., 2008). Muscle volume did not increase, suggesting the effect is aerobic rather than anaerobic.
Effective Protocol
Ubiquinol (reduced CoQ10) is absorbed substantially better than ubiquinone — particularly in older adults whose endogenous CoQ10 synthesis capacity has declined. Taking it with a fatty meal improves absorption further.
A longer supplementation period (at least 4 weeks) is generally needed to normalise blood CoQ10 levels before performance benefits appear.
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Who Benefits Most?
The evidence points to the greatest benefit for:
- Athletes over 40 (natural CoQ10 synthesis declines with age)
- People taking statin medications (statins suppress CoQ10 biosynthesis)
- Endurance athletes (runners, cyclists, triathletes)
- Individuals with impaired energy production (conditions associated with mitochondrial dysfunction)
Young, healthy strength athletes with normal CoQ10 status gain less benefit.
Honest Verdict
CoQ10 is a supplement with evidence-based benefit for endurance athletes, especially the older age group and those on statins. Evidence for strength athletes is weaker. As a general supporter of cellular health and mitochondrial function, it is one of the more considered supplement choices.
References
- Sanoobar, M., Dehghani-Ghobadi, Z., Ebrahimi, M., Afshar, H., Meamar, R., & Jalalpoor, S. (2016). Coenzyme Q10 supplementation reduces oxidative stress and increases antioxidant enzyme activity in patients with relapsing-remitting multiple sclerosis. Nutritional Neuroscience, 19(7), 321-328.
- Cooke, M., Iosia, M., Buford, T., Shelmadine, B., Hudson, G., Kerksick, C., ... & Kreider, R. (2008). Effects of acute and 14-day coenzyme Q10 supplementation on exercise performance in both trained and untrained individuals. Journal of the International Society of Sports Nutrition, 5, 8. https://pubmed.ncbi.nlm.nih.gov/18318910/
- Gomes, E. C., Silva, A. N., & de Oliveira, M. R. (2012). Oxidants, antioxidants, and the beneficial roles of exercise-induced production of reactive species. Oxidative Medicine and Cellular Longevity, 2012, 756132. https://pubmed.ncbi.nlm.nih.gov/22701757/
FAQ
Is ubiquinol better than ubiquinone?
Ubiquinol is the reduced (active) form of CoQ10 and absorbs better, especially in adults over 40. In young, healthy individuals the difference is smaller since the body converts ubiquinone to ubiquinol efficiently.
Do statins lower CoQ10 levels?
Yes. Statins inhibit HMG-CoA reductase, which is also involved in CoQ10 biosynthesis. CoQ10 supplementation is particularly justified for people on statins, though clinical guidelines do not universally recommend it for all statin users.
How long before results appear?
Raising blood CoQ10 levels takes time. Performance benefits generally appear after 4-8 weeks of continuous supplementation.
