Coenzyme Q10 – its role in energy production, forms and dosage
What exactly is coenzyme Q10 and why does its natural production decline with age? Find out how ubiquinol differs from ubiquinone, what research says about taking it as a supplement, and how to dose it correctly.
Coenzyme Q10 (CoQ10) is a lipophilic compound found naturally in almost every cell of the human body. Its biochemical role is well documented – it plays a part in the mitochondrial respiratory chain, where it is involved in electron transport and the synthesis of ATP, the cell’s primary ‘energy currency’. The highest concentrations of Q10 are found in tissues with high energy demands – the heart, liver, kidneys and muscles. Importantly, following an analysis of the available scientific evidence, the European Food Safety Authority has not authorised any specific health claims for coenzyme Q10. This means that when communicating about Q10, we must focus on describing the biochemical mechanism and the research context, without attributing specific health benefits.
What is coenzyme Q10 and what is its biological function?
From a biochemical perspective, coenzyme Q10 is a lipid (classified as a ubiquinone) located mainly in the inner membrane of mitochondria. There, it acts as an electron carrier between the enzyme complexes of the respiratory chain. Without this transport, the proton gradient essential for the production of ATP – cellular energy – cannot be established.
Q10 occurs in the body in two interconvertible forms: ubiquinone (the oxidised form) and ubiquinol (the reduced form). It is ubiquinol that performs the additional function of being one of the most potent fat-soluble antioxidants. The body dynamically converts between these two forms depending on cellular needs.
The decline in Q10 levels with age – what we know
Studies on coenzyme Q10 levels in various tissues show that its endogenous production gradually declines with age. The highest concentrations are observed in young adults, and after the age of 30–40, Q10 levels in tissues begin to decline gradually. This biological phenomenon has led to coenzyme Q10 supplementation becoming the subject of numerous studies – particularly in the context of middle-aged and older adults.
A second circumstance in which Q10 levels in the body may potentially fall is the use of statins – cholesterol-lowering drugs. Statins work by inhibiting the enzyme HMG-CoA reductase, which is essential for both the synthesis of cholesterol and the synthesis of mevalonate – a precursor of coenzyme Q10. Some studies suggest that Q10 supplementation may be considered for people taking statins, but this should always be discussed with their doctor.
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Ubiquinol vs ubiquinone – which form to choose
This is one of the most frequently asked questions when choosing a Q10 supplement. Both forms are biologically active and are converted into one another within the body.
Ubiquinone is the oxidised form – the classic form and the one most commonly found in supplements. It is chemically more stable and more cost-effective to produce. Once absorbed, the body reduces it to ubiquinol within the cells.
Ubiquinol is the reduced form, which, according to some studies, is better absorbed from the gastrointestinal tract, particularly in older people and those with a reduced ability to reduce ubiquinone. However, it is more expensive and less chemically stable.
In practice, for most adults, ubiquinone at typical doses of 100–200 mg per day proves to be a sensible choice. Ubiquinol is sometimes recommended for people over the age of 60 and in situations where bioavailability is of key importance. You can find out more about Q10 itself in the article coenzyme Q10 – what it is, properties, dosage.
What the research says about Q10 supplementation
Research into coenzyme Q10 is quite extensive. Clinical trials have analysed its potential impact on, amongst other things, cardiac parameters, exercise capacity, metabolic parameters and perceived fatigue in people taking statins. The results are mixed – some studies point to potentially beneficial effects, whilst others show no significant differences compared with a placebo.
The most significant limitation from a European perspective, however, is that the scientific data – despite its breadth – has not met the EFSA’s rigorous criteria for the approval of specific health claims. Q10 supplementation should therefore be regarded as a complement to the daily diet, not as a guaranteed solution to specific health problems. Those interested in other ingredients that affect energy levels will find interesting information in the article on Schisandra (schisandra) and in the article on MCT oil.
Coenzyme Q10 dosage – how much, when and with what
A typical dose of Q10 in dietary supplements ranges from 30 to 200 mg per day. Lower doses (30–100 mg) are suitable as a daily supplement, whilst higher doses (100–200 mg) are often chosen by adults seeking more pronounced support.
Coenzyme Q10 is a lipophilic substance – this means that its absorption is significantly improved by the presence of fats in a meal. It is therefore best taken with the main meal of the day (usually lunch), which contains fats – for example, with olive oil, avocado, nuts or a richer sauce. The time of day is otherwise of little importance, although some people prefer to take Q10 in the morning because of its role in cellular energy production.
[tip: Coenzyme Q10 is a fat-soluble substance – take it with a meal containing fats (e.g. lunch with olive oil or nuts). Fasting and low-fat meals can significantly reduce its absorption.]
Who might benefit from taking Q10
Coenzyme Q10 supplementation is most commonly considered by adults, particularly those of mature age, when the body’s natural production of this compound gradually declines. It may also be an interesting option for people taking statins – following consultation with their GP – and for physically active individuals seeking additional support for recovery.
Q10 is naturally present in small amounts in meat (particularly in animal heart, liver and kidneys), oily fish (sardines, mackerel, salmon), nuts and seeds. The daily diet typically provides 3–6 mg of Q10, which is significantly less than typical supplement doses. You can find the full range of products supporting the mature body in the categories Specialist and Antioxidants.
[note: Vitaler’s Coenzyme Q10 is a pure form of ubiquinone in a convenient, easy-to-dose capsule – free from artificial colourings, preservatives and unnecessary fillers. The capsule form effectively protects Q10 from oxidation.]
Safety and contraindications
Coenzyme Q10 is well tolerated by most adults. In clinical trials, doses of up to 1,200 mg per day were used without any significant adverse effects. The most commonly observed side effects (rare) include mild gastrointestinal discomfort, headaches or insomnia (when taking in the evening).
[warning:If you are taking anticoagulants (warfarin, acenocoumarol), you must consult your doctor before taking CoQ10 supplements – it may affect the action of these medicines. Supplementation is also not recommended for pregnant or breastfeeding women without prior consultation.]
People with chronic conditions, those taking medication on a long-term basis, or those planning long-term supplementation with higher doses should speak to a doctor before incorporating coenzyme Q10 into their daily routine.
Summary: Coenzyme Q10 is a compound with a well-documented role in the mitochondrial respiratory chain – it is involved in cellular energy production (ATP). It occurs in two forms (ubiquinone and ubiquinol), both of which are biologically active. The EFSA has not authorised any specific health claims for Q10, so supplementation should be regarded as a complement to the daily diet. A typical dose is 100–200 mg per day, taken with a meal containing fats. Supplementation is most commonly considered by middle-aged adults and those taking statins – always after consulting a doctor.