CoQ10 (Ubiquinol & Ubiquinone)

Updated June 29, 2026

Coenzyme Q10 is a fat-soluble molecule present in virtually every cell, with its highest concentrations in tissues with the greatest energy demand — the heart, liver, kidneys, and skeletal muscle. It sits at the core of the mitochondrial electron transport chain, shuttling electrons between Complex I, Complex II, and Complex III, enabling the proton gradient that drives ATP synthesis. Without adequate CoQ10, the chain stutters and ATP output falls. Beyond energy production, CoQ10 also acts as a potent membrane-bound antioxidant, neutralising free radicals directly within the mitochondrial inner membrane where oxidative stress is highest.

The body synthesises CoQ10 endogenously, but production declines steadily from around age 40. Heart tissue CoQ10 levels in people over 70 are roughly 40 to 50 percent lower than in young adults. Two additional factors accelerate depletion: statin medications, which inhibit the same mevalonate pathway used to synthesise CoQ10, causing measurable drops in plasma and muscle CoQ10 within weeks of starting treatment; and intense physical training, which increases demand faster than synthesis can compensate. Statin users and serious athletes are consistently the two groups showing the clearest measurable response to supplementation.

CoQ10 comes in two forms. Ubiquinone is the oxidised form and the most studied historically. Ubiquinol is the reduced, active antioxidant form that cells use directly. Ubiquinol has superior bioavailability in humans, particularly in older adults and people with absorption issues — some trials show two to four times higher plasma CoQ10 per dose compared to ubiquinone. For people under 40 in good health, the conversion from ubiquinone is efficient enough that the form matters less. For everyone else, ubiquinol is the better choice.

Standard dosing ranges from 100 to 300 mg per day, taken with a fat-containing meal to maximise absorption. People on statins often use 200 to 300 mg to compensate for drug-induced depletion. The evidence for cardiovascular benefit is strongest in heart failure, where trials show improved ejection fraction and reduced hospitalisation with 300 mg daily over two years (the Q-SYMBIO trial). For general energy support and antioxidant benefit, 100 to 200 mg is the typical range. CoQ10 has an excellent safety profile with no known toxicity at doses up to 3,000 mg per day in studies.

The benefits most consistently reported are reduced fatigue, better exercise recovery, and improved markers of oxidative stress. Migraine frequency reduction has also been confirmed in several controlled trials, with effects appearing after six to twelve weeks of consistent dosing. For anyone on a statin, CoQ10 supplementation is one of the most evidence-backed additions to a supplement routine. This is general information, not medical advice.