CoQ10. The Runner's File.

The supplement most runners ignore. The one masters athletes shouldn't.

CoQ10 doesn't get talked about in running. It should.

It sits at the exact point in cellular metabolism where the difference between a strong mile and a slow one is decided. It declines with age. It declines with statin use. It's depleted by endurance training itself. And in the few decent studies done in athletes, supplementation has produced measurable improvements in peak power, fatigue, and markers of muscle damage.

This is not a hype supplement. It is not a 30-day transformation. It is a slow, foundational compound for runners who plan to keep running for the next 20 years.

Built for the long arc.

What CoQ10 actually does

Every mile you run is paid for in ATP — adenosine triphosphate, the cellular energy currency. ATP is generated primarily through oxidative phosphorylation, a series of reactions inside the mitochondria. CoQ10 is a critical electron carrier in that chain. Without adequate CoQ10, the chain stalls. ATP output drops. Lactate accumulates faster. Fatigue arrives earlier.

CoQ10 also operates as a mitochondrial antioxidant. Endurance training generates reactive oxygen species — necessary for adaptation, damaging in excess. CoQ10 helps regulate the balance, scavenging free radicals at the inner mitochondrial membrane where oxidative damage hits hardest (Sarmiento et al. 2025).

A 2025 systematic review in Complementary Therapies in Medicine concluded that CoQ10 supplementation reduces markers of exercise-induced muscle damage and oxidative stress in athletes, with practical benefits for recovery and fatigue.

Two facts make this matter more for runners than the average gym-goer:

First, endurance training produces more cumulative oxidative stress than resistance training. The mitochondrial load of a marathon block is several orders of magnitude higher than a 60-minute strength session.

Second, CoQ10 levels in the body decline with age. The drop starts in the late twenties. By 40, plasma and tissue CoQ10 are measurably lower. By 60, they can be half of peak values (Barcelos & Haas 2019). A 2024 study confirmed that older and elite athletes show lower tissue CoQ10 concentrations in heart and skeletal muscle (Gao et al. 2024).

This is the masters runner's compound.

What the research actually shows

The evidence base for CoQ10 in athletes is smaller than for caffeine or beetroot. But the trials that exist are well-designed and point in a consistent direction.

The most cited study is a 2013 double-blind, placebo-controlled trial of 100 trained German Olympic athletes (Alf et al. 2013). Participants received 300 mg/day of CoQ10 or placebo for 6 weeks. Peak power production, measured on a bike ergometer, increased significantly in the CoQ10 group. The effect size was modest — but at elite level, modest improvements decide podiums.

A separate trial in male distance runners found that 6 days of CoQ10 supplementation (300 mg/day) significantly reduced serum markers of muscle damage including creatine kinase, lactate dehydrogenase, and AST after consecutive strenuous training sessions. Subjective fatigue was also lower (Sakai et al. 2018).

The 2025 systematic review and meta-analysis in Complementary Therapies in Medicine pooled the available trials and concluded that CoQ10 supplementation improves markers of exercise-induced muscle damage and reduces oxidative stress in athletes.

Three things to note honestly:

The effect on VO2max is small or absent in young, well-trained athletes. CoQ10 is not a VO2max compound. Treat it as a recovery and resilience compound.

The strongest signal is in masters athletes and in athletes performing very high training volumes. The 2013 Alf trial concluded that "older athletes and weekend warriors might profit even more from CoQ10 supplementation than young, well-trained athletes."

Effects appear to build over weeks. Plasma CoQ10 takes 2–3 weeks of consistent supplementation to plateau. This is not an acute pre-race product.

Dose, timing, and the fat question

CoQ10 is fat-soluble. Taking it on an empty stomach reduces absorption by roughly 75%. Take it with a meal containing fat. Olive oil, eggs, avocado, fatty fish, full-fat yogurt — any of these are adequate.

Splitting the daily dose into two improves plasma levels over single dosing at the same total amount. For runners on 200–300 mg/day, take half with breakfast and half with lunch or dinner.

Avoid taking CoQ10 in the evening if you're sensitive. A small subset of people report mild sleep disruption at higher doses. Most don't notice.

The statin overlap

If you take a statin, you should be taking CoQ10. The pharmacological mechanism that statins use to lower cholesterol — inhibition of HMG-CoA reductase — also blocks the body's endogenous synthesis of CoQ10. Plasma CoQ10 drops 20–40% within weeks of starting a statin (Marcoff & Thompson 2007).

This depletion is implicated in statin-associated muscle symptoms — fatigue, weakness, and the muscle aches that make many patients want to quit their statin. The clinical evidence for CoQ10 supplementation specifically resolving statin myalgia is mixed but the mechanism is clear and the downside is minimal.

If you are a runner on a statin and you experience muscle symptoms: 200 mg CoQ10 per day is the protocol most lipidologists will support.

This is a conversation to have with your physician. Not a do-it-yourself decision.

What CoQ10 won't do

Be clear-eyed about the limits.

CoQ10 will not noticeably change your 5K time in a 6-week supplementation period. The effect on time-trial performance in trained athletes is small.

CoQ10 will not "boost energy" the way caffeine will. It works at the cellular level, on time scales of weeks. If you take it expecting an acute lift, you'll be disappointed.

CoQ10 will not replace sleep, food, or training. Like every supplement we sell, it is a layer on top of the work. It is not a substitute for the work.

CoQ10 will not be the difference between making a marathon goal and not. The difference is in your training. The supplements support the training.

Who should consider this

Runners over 35. Endogenous CoQ10 is dropping. Mitochondrial efficiency is the longevity lever.

Anyone on a statin. The pharmacological case is strong.

Heavy-training masters athletes. The signal in the literature is largest in this group.

Runners with a family history of cardiovascular disease. CoQ10 has documented cardiovascular benefits independent of its athletic case.

Runners recovering from periods of overtraining. The mitochondrial damage from chronic overreaching takes weeks to resolve. CoQ10 supports that recovery.

Anyone training at altitude. Mitochondrial efficiency matters more when oxygen delivery is the limiting factor.

Who can skip it

Runners under 30 with no cardiovascular family history, eating a varied whole-food diet, training moderate volumes. Endogenous production is adequate. Spend your supplement budget elsewhere.

Runners not consistent with the basics. If you're not sleeping 7 hours, eating enough, and following a structured training plan, CoQ10 will not bridge the gap.

Runners looking for an acute race-day boost. This is not that product. Use caffeine and beetroot for race-day mechanics.

The bottom line

CoQ10 isn't a performance supplement in the way caffeine is. It's an infrastructure supplement. You don't take it for next Saturday's race. You take it because you're 38 years old, you've been running for 15 years, and you plan to keep running for another 30.

The miles are the work. The mitochondria are the engine. CoQ10 is the maintenance.

Stay in it.

References

Alf, D., Schmidt, M. E., & Siebrecht, S. C. (2013). CoQ10 supplementation enhances peak power production in trained athletes: a double-blind, placebo controlled study. Journal of the International Society of Sports Nutrition, 10(1), 24.

Barcelos, I. P., & Haas, R. H. (2019). CoQ10 and aging. Biology, 8(2), 28.

Failla, M. L., Chitchumroonchokchai, C., & Aoki, F. (2014). Increased bioavailability of ubiquinol compared to that of ubiquinone is due to more efficient micellarization during digestion. Journal of Agricultural and Food Chemistry, 62(29), 7174–7182.

Gao, X., et al. (2024). CoQ10 and athletic performance in aging populations. Nutrients.

Marcoff, L., & Thompson, P. D. (2007). The role of coenzyme Q10 in statin-associated myopathy: a systematic review. Journal of the American College of Cardiology, 49(23), 2231–2237.

Sakai, A., et al. (2018). Short-term CoQ10 supplementation alleviates tissue damage in muscle and fatigue caused by strenuous exercise in male distance runners. International Journal for Vitamin and Nutrition Research.

Sarmiento, S., et al. (2025). Can CoQ10 supplementation reduce exercise-induced muscle damage and oxidative stress in athletes? A systematic review and meta-analysis. Complementary Therapies in Medicine.

Part of the Ingredient Files series. Updated annually.