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Heart and circulation Q&As

Co-enzyme Q10 or Ubiquinol: which is best for reducing the risk of a cardiovascular event?

Which is more effective – coenzyme Q10 or ubiquinol?
Rédaction Supersmart.
2019-11-04Comments (0)

Co-enzyme Q10 (also known as ubiquinone) is converted in the body into an active form called ubiquinol. That’s the difference – one is an inactive form and the other an active one.

So what does that really mean? If you were to take 200mg a day of CoQ10, you would increase your ubiquinol blood levels by around 60% (according to research published in 2018) (1). If you were to take the same amount of ubiquinol, those same levels would rise by 150%! A previously-conducted study came to the same conclusion (2).

In other words, both substances will produce increased blood levels, but ubiquinol is the more effective of the two.

This is due to ubiquinol’s superior bioavailability (co-enzyme Q10 is not 100% absorbed in the gut) and the rate at which CoQ10 is converted (only 90% is estimated to be transformed in the body into ubiquinol). Unsurprisingly, this superiority comes at a price: co-enzyme Q10 supplements are usually less expensive than ubiquinol supplements …

What is ubiquinol’s role in the body?

Ubiquinol is a valuable antioxidant compound which is used to create energy in most of the body’s cells. It is produced in the heart, liver, kidneys and pancreas, and is then carried throughout the body.

The body’s production of ubiquinol is disrupted by taking statins, as well as by cardiac disease and ageing. In actual fact, blood levels of co-enzyme Q10 increase up to the age of 60 and it’s only in the brain and in heart tissue that they diminish over time. More importantly, there’s also an age-related decline in the rate at which co-enzyme Q10 is converted into ubiquinol!

So as we get older, we have decreasing levels of ubiquinol, a decline which has been directly linked to increased oxidative stress (3-4) (which is itself a factor in almost all ‘modern’ diseases). And since coQ10 is virtually absent from our diet (apart from tiny amounts in beef and chicken), supplements represent the best way of increasing ubiquinol levels.

Research has shown that coQ10 and ubiquinol play a role in a number of physiological effects:

Note: It takes around three months’ supplementation before the first effects appear (7).

Things to know before taking CoQ10 and Ubiquinol

As these two compounds are fat-soluble, it’s important to take them with a meal rich in fatty acids (generally lunch), or better still, to choose supplements that contain optimal levels of fatty acids ( Coenzyme Q10 30 mg and Ubiquinol™ 100 mg).

Taking them with food also slows down intestinal transit, leaving more time for the CoQ10 and Ubiquinol to be absorbed in the small intestine. The doses used in clinical trials vary from 50mg to 200mg a day, ideally spread over two or three doses.


  1. Zhang Y, Liu J , Chen XQ , Oliver Chen CY ., Ubiquinol is superior to ubiquinone to enhance Coenzyme Q10 status in older men. Food Funct. 2018 Nov 14;9(11):5653-5659. doi: 10.1039/c8fo00971f.
  2. Langsjoen PH, Langsjoen AM. Comparison study of plasma coenzyme Q10 levels in healthy subjects supplemented with ubiquinol versus ubiquinone. Clin Pharmacol Drug Dev. 2014 Jan;3(1):13-7. doi: 10.1002/cpdd.73. Epub 2013 Oct 8.
  3. Niklowitz J et al, Coenzyme Q10 serum concentration and redox status in European adults: influence of age, sex, and lipoprotein concentration, J Clin Biochem Nutr. 2016 May; 58(3): 240–245.
  4. Claessens et al, Rapid and sensitive analysis of reduced and oxidized coenzyme Q10 in human plasma by ultra performance liquid chromatography-tandem mass spectrometry and application to studies in healthy human subjects, Ann Clin Biochem. Author manuscript; available in PMC 2017 Mar 1.
  5. Fotino et al. Effect of coenzyme Q₁₀ supplementation on heart failure: a meta-analysis, Am J Clin Nutr. 2013 Feb;97(2):268-75. doi: 10.3945/ajcn.112.040741. Epub 2012 Dec 5.
  6. Zhang, et al. Treatment of coenzyme Q10 for 24 weeks improves lipid and glycemic profile in dyslipidemic individuals, Journal of Clinical Lipidology, Volume 12, Issue 2, March–April 2018, Pages 417-427.e5
  7. Nattagh-Eshtivania et al, The effect of Coenzyme Q10 supplementation on serum levels of lactate, pyruvate, matrix metalloproteinase 9 and nitric oxide in women with migraine. A double blind, placebo, controlled randomized clinical trial


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