CoQ10 Benefits: Energy, Heart, Fertility & Ageing

Key takeaways

• CoQ10 helps your cells make energy and protects them from oxidative damage. Levels fall with age and with statin use.

• The strongest evidence is for heart failure, as an add-on to medical treatment.

• Smaller trials show benefits for fatigue, statin muscle aches, IVF outcomes, migraine and skin.

• Most studies used 100–300 mg a day, taken with food, for at least two to three months.

• CoQ10 is well tolerated, but it may interact with warfarin, diabetes medicines and some cancer treatments.

What is CoQ10?

Coenzyme Q10 (CoQ10) is a fat-soluble compound found in almost every cell in your body. It sits inside your mitochondria, where it helps turn the food you eat into energy, and it works as an antioxidant that protects cell membranes. The heart, liver, kidneys and muscles hold the most, because they use the most energy.

Your body makes its own CoQ10, but levels fall as you get older. Cholesterol-lowering statins also lower blood CoQ10, because they block part of the same pathway the body uses to make it.¹ That is why most questions about CoQ10 come from people over 50 or people on a statin.

CoQ10 and energy

To be honest, CoQ10 is not a stimulant. In a small crossover trial, 17 healthy volunteers took 300 mg daily for eight days. They reported less fatigue and performed better on a tiring cycling test than when they took placebo.² That is encouraging. Still, don't expect a dramatic energy lift if your levels are already normal. Tiredness that lasts for weeks deserves a proper work-up first, including thyroid, iron, sleep and mood. Our guide to the best vitamins for energy covers the other common causes.

CoQ10 and the heart

This is where the evidence is strongest. In the Q-SYMBIO trial, 420 people with moderate to severe heart failure took 100 mg three times daily or placebo for two years, on top of their usual treatment. Major cardiovascular events occurred in 15% of the CoQ10 group versus 26% of the placebo group.³

In a Swedish trial, 443 adults aged 70 to 88 took selenium and CoQ10 together, or placebo, for four years. Over five years of follow-up, cardiovascular deaths were 5.9% in the supplement group versus 12.6% with placebo, roughly half.⁴ The difference was still there 12 years later.⁵ These results support CoQ10 as an add-on to medical care, not a replacement for it.

CoQ10 and statins

Many people on statins ask about muscle aches. A meta-analysis of 12 randomised trials found that CoQ10 reduced statin-related muscle pain, cramps and weakness.⁶ Not every trial agrees: in a study of people with confirmed statin muscle pain, CoQ10 did no better than placebo.⁷ The sensible approach: CoQ10 is reasonable to try, but never stop or change your statin without talking to your prescriber.

CoQ10 benefits for women

CoQ10 benefits for women centre on fertility, migraine and skin. In a randomised study of 186 women under 35 with low ovarian reserve, taking CoQ10 for 60 days before IVF led to more eggs retrieved and more high-quality embryos. Pregnancy and live-birth rates trended higher but the difference was not statistically significant.⁸ In 42 people with migraine, a condition far more common in women, CoQ10 tripled the share who halved their attack frequency (47.6% vs 14.4%).⁹ In a 12-week trial, CoQ10 also reduced fine wrinkles and improved skin smoothness.¹⁰

CoQ10, ageing and your liver

Healthy ageing depends on organs that use a lot of energy, and the liver is one of them. In 41 adults with fatty liver disease, 100 mg of CoQ10 daily for 12 weeks lowered the liver enzymes AST and GGT, as well as markers of inflammation, compared with placebo.¹¹ That is a small study, but it fits with what we know about CoQ10's role in the mitochondria. If you want to know what a struggling liver looks like, read 7 signs your liver is struggling.

How much CoQ10 should you take?

The trials above used between 100 mg and 300 mg a day, usually for at least two to three months. CoQ10 is fat-soluble, so take it with a meal that contains some fat. Doses above 100 mg are often split across two meals. Food alone won't get you to these amounts: the richest sources are organ meats such as heart and liver, oily fish, meat, nuts and seeds, and a normal diet provides only a few milligrams a day.

Ubiquinol vs ubiquinone

CoQ10 comes in two forms. Ubiquinone is the oxidised form and the one used in most clinical trials, including the heart failure trial above. Ubiquinol is the reduced, active form, and your body converts one into the other all the time. Ubiquinol is often marketed as better absorbed, but head-to-head evidence is limited. For most people, the dose, taking it with food and taking it consistently matter more than the form.

CoQ10 side effects and interactions

CoQ10 is generally well tolerated. The most common side effects are mild: an upset stomach, nausea, diarrhoea or trouble sleeping if taken late in the day. The interactions matter more:¹²

• Warfarin: CoQ10 may make warfarin less effective.

• Diabetes medicines: CoQ10 may lower blood sugar, so check your levels if you use insulin or other glucose-lowering drugs.

• Cancer treatment: antioxidants may interfere with some chemotherapy and radiotherapy, so ask your oncology team first.

• Pregnancy and breastfeeding: there is too little safety data, so speak to your doctor before taking it.

The bottom line

CoQ10 is one of the better-studied supplements, but it is not a cure-all. The case is strongest for people with heart failure, people on statins with muscle aches, women preparing for IVF and people with frequent migraines, always alongside their medical care. If you are healthy and simply tired, look at sleep, iron, thyroid and B12 first.

References

1. Qu H, Meng YY, Chai H, et al. The effect of statin treatment on circulating coenzyme Q10 concentrations: an updated meta-analysis of randomized controlled trials. Eur J Med Res. 2018;23:57. doi:10.1186/s40001-018-0353-6. https://pubmed.ncbi.nlm.nih.gov/30414615/

2. Mizuno K, Tanaka M, Nozaki S, et al. Antifatigue effects of coenzyme Q10 during physical fatigue. Nutrition. 2008;24(4):293-9. doi:10.1016/j.nut.2007.12.007. https://pubmed.ncbi.nlm.nih.gov/18272335/

3. 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):641-9. doi:10.1016/j.jchf.2014.06.008. https://pubmed.ncbi.nlm.nih.gov/25282031/

4. Alehagen U, Johansson P, Björnstedt M, et al. Cardiovascular mortality and N-terminal-proBNP reduced after combined selenium and coenzyme Q10 supplementation: a 5-year prospective randomized double-blind placebo-controlled trial among elderly Swedish citizens. Int J Cardiol. 2013;167(5):1860-6. doi:10.1016/j.ijcard.2012.04.156. https://pubmed.ncbi.nlm.nih.gov/22626835/

5. Alehagen U, Aaseth J, Alexander J, Johansson P. Still reduced cardiovascular mortality 12 years after supplementation with selenium and coenzyme Q10 for four years: a validation of previous 10-year follow-up results of a prospective randomized double-blind placebo-controlled trial in elderly. PLoS One. 2018;13(4):e0193120. doi:10.1371/journal.pone.0193120. https://pubmed.ncbi.nlm.nih.gov/29641571/

6. 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. doi:10.1161/JAHA.118.009835. https://pubmed.ncbi.nlm.nih.gov/30371340/

7. Taylor BA, Lorson L, White CM, Thompson PD. A randomized trial of coenzyme Q10 in patients with confirmed statin myopathy. Atherosclerosis. 2015;238(2):329-35. doi:10.1016/j.atherosclerosis.2014.12.016. https://pubmed.ncbi.nlm.nih.gov/25545331/

8. Xu Y, Nisenblat V, Lu C, et al. Pretreatment with coenzyme Q10 improves ovarian response and embryo quality in low-prognosis young women with decreased ovarian reserve: a randomized controlled trial. Reprod Biol Endocrinol. 2018;16:29. doi:10.1186/s12958-018-0343-0. https://pubmed.ncbi.nlm.nih.gov/29587861/

9. Sándor PS, Di Clemente L, Coppola G, et al. Efficacy of coenzyme Q10 in migraine prophylaxis: a randomized controlled trial. Neurology. 2005;64(4):713-5. doi:10.1212/01.WNL.0000151975.03598.ED. https://pubmed.ncbi.nlm.nih.gov/15728298/

10. Žmitek K, Pogačnik T, Mervic L, et al. The effect of dietary intake of coenzyme Q10 on skin parameters and condition: results of a randomised, placebo-controlled, double-blind study. Biofactors. 2017;43(1):132-40. doi:10.1002/biof.1316. https://pubmed.ncbi.nlm.nih.gov/27548886/

11. Farsi F, Mohammadshahi M, Alavinejad P, et al. Functions of coenzyme Q10 supplementation on liver enzymes, markers of systemic inflammation, and adipokines in patients affected by nonalcoholic fatty liver disease: a double-blind, placebo-controlled, randomized clinical trial. J Am Coll Nutr. 2016;35(4):346-53. doi:10.1080/07315724.2015.1021057. https://pubmed.ncbi.nlm.nih.gov/26156412/

12. National Center for Complementary and Integrative Health. Coenzyme Q10. https://www.nccih.nih.gov/health/coenzyme-q10