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CoQ10 (Coenzyme Q10 / ubiquinol)

The mitochondrial spark plug — and the antioxidant supplement with the most convincing targeted uses.

Reviewed by Bodil Isaksson, Licensed Biomedical Scientist (Sweden)Last reviewed July 2026Supplement guide

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CoQ10 sits at the heart of how cells make energy, and doubles as a fat-soluble antioxidant. Unlike most antioxidant pills, it has some genuinely persuasive clinical evidence — in specific groups.

Key takeaways

  • CoQ10 is essential for mitochondrial energy production and is a fat-soluble antioxidant; the body makes less with age and on statins.
  • Best evidence: as an add-on in chronic heart failure — the Q-SYMBIO trial cut cardiovascular events.1
  • Reasonable (if mixed) for statin-associated muscle symptoms and migraine prevention.
  • Ubiquinol is better absorbed; typical dose 100–300 mg/day with a fatty meal. Very safe.

What it is

Coenzyme Q10 (ubiquinone, or its reduced form ubiquinol) shuttles electrons in the mitochondrial energy chain and protects membranes from oxidation. Levels fall with age and are lowered by statin drugs.

The evidence

The standout is heart failure: in the randomised Q-SYMBIO trial, CoQ10 100 mg three times daily halved major cardiovascular events over two years versus placebo.1 Evidence is weaker but plausible for statin muscle aches and migraine prophylaxis.

Dose & forms

100–300 mg/day, taken with a meal containing fat for absorption. Ubiquinol is the more bioavailable form, useful for older adults.

Safety & who benefits

Very well tolerated. Most worthwhile for people with heart failure (alongside standard care), those on statins with muscle symptoms, and migraine sufferers.

Bottom line: the antioxidant supplement with the best targeted evidence — genuinely useful in heart failure and worth a try for statin muscle aches.

References

Adult research summary for education, not a prescription. These are food supplements, not treatments for disease.

  1. Mortensen SA, et al. The effect of Coenzyme Q10 on morbidity and mortality in chronic heart failure (Q-SYMBIO): a randomized double-blind trial. JACC Heart Fail 2014. pubmed.ncbi.nlm.nih.gov

This article summarises nutrition science for education. It is not a substitute for individual medical advice; consult a professional before starting a supplement, in pregnancy, or alongside medication.