What is Coenzyme Q10: How it Protects Against Oxidative Stress
Leila WehrhahnUpdated:Key points at a glance:
Coenzyme Q10, also known as ubiquinone, is a naturally occurring substance found in all cells. It is involved in electron transport within the mitochondria and plays a role in the formation of ATP. As an antioxidant, it helps neutralise free radicals and is associated with the reduction of oxidative stress. High concentrations are found in the heart, liver and kidneys. Levels tend to decrease with age and may also be influenced by the use of statins. Dietary sources include fish, organ meats and nuts. Supplementation with ubiquinol can support absorption, and intake is often recommended with a meal that contains fat.
What is coenzyme Q10?
Coenzyme Q10 – also known as ubiquinone – is a naturally occurring nutrient found in every cell of the body. This coenzyme plays a central role in energy metabolism, more specifically in the so‑called respiratory chain inside the mitochondria, the “powerhouses” of our cells. Here it is closely involved in energy production and helps provide the energy needed for vital processes in the organs.
The name “ubiquinone” derives from “ubiquitous” (present everywhere), as the coenzyme is found in almost all tissues. Particularly high concentrations occur in energy‑demanding organs such as the heart, liver and kidneys. As we age, the body’s own production declines, which can lead to lower coenzyme Q10 levels. This decrease may affect the whole organism – especially energy availability and the body’s ability to counteract free radicals.
Coenzyme Q10 is also described as a potent antioxidant, as it can neutralise free radicals and thereby help to limit potential cell damage. This combination of involvement in energy generation and cellular protection makes it one of the most frequently discussed substances in relation to vitality, performance and general wellbeing.
Coenzyme Q10 is a naturally occurring substance that contributes to energy production and helps protect cells from free radicals. It is particularly active in the heart, liver and kidneys.
Coenzyme Q10 in the body: energy, cell protection and ageing
The effects of coenzyme Q10 are usually described in terms of two main functions: supporting energy production and providing antioxidant support for the cells. Within the respiratory chain in the mitochondria, the coenzyme helps transport electrons between complexes, enabling energy generation in the form of ATP. Without sufficient ubiquinone, the body would not be able to provide this energy as efficiently.
In addition, coenzyme Q10 acts as an antioxidant and helps protect cells from oxidative stress associated with free radicals. These reactive radicals are formed during metabolic processes and can be increased by UV radiation or environmental factors. Together with vitamin E and vitamin C, the coenzyme contributes to limiting oxidative damage and to stabilising cell structures. Research indicates that declining coenzyme Q10 levels with age may be associated with increased oxidative stress and visible signs of skin ageing.
As the body’s own production decreases with age, additional intake through food or food supplements is often discussed as a way to help stabilise levels. This is particularly considered for people over 40 or for those taking statins (cholesterol‑lowering medications), which can influence the body’s own formation of Q10.
Coenzyme Q10 contributes to energy production and helps protect cells from oxidative stress. As Q10 levels tend to decrease with age, supplementation is often considered.
Natural sources and supplementation of coenzyme Q10
The human body can produce coenzyme Q10 to a certain extent itself, but with increasing age and under certain influences such as stress, an unbalanced diet or the use of some medications (e.g. statins), this production may decline. In such cases, targeted supplementation is sometimes used to help support overall intake.
Certain foods also contain coenzyme Q10, including:
- Oily fish such as mackerel, tuna and sardines
- Offal such as liver and heart
- Nuts, particularly peanuts and pistachios
- Wholegrain products, spinach and broccoli
Because the concentration in foods is relatively low, food supplements in capsule or liquid form are often considered a more efficient way to increase Q10 intake. Taking coenzyme Q10 together with vitamin E and vitamin C is also discussed in the context of antioxidant support, as these vitamins can help regenerate the coenzyme in the body.
When choosing products, the specific form plays an important role: ubiquinol is the reduced, active variant of ubiquinone and is often described as having higher bioavailability. This means it may be absorbed more readily by the organism and made available to the cells more quickly.
Coenzyme Q10 is found in fish, liver and nuts, but supplements can provide a more concentrated intake. Ubiquinol is considered the more bioavailable form.
Health relevance and use in therapies
The effects of coenzyme Q10 extend beyond energy production. Research findings suggest that coenzyme Q10 may play a supportive role in various conditions and therapeutic contexts. It is increasingly being studied in relation to cardiovascular therapies, as it is thought to help support the energy supply of the heart muscle and to limit oxidative damage.
For people who take statins, additional supplementation with coenzyme Q10 is frequently discussed. These medicines lower cholesterol levels but can at the same time influence the body’s own production of Q10. This has been associated with muscle pain and fatigue in some individuals. Targeted intake of ubiquinol or ubiquinone is therefore being investigated for its potential to support muscle comfort. Studies suggest that maintaining a stable coenzyme Q10 level may help to moderate certain statin‑associated side effects.
Q10 is also increasingly used in the area of skin – both in supplements and in cosmetic products. It helps protect skin cells from the effects of UV radiation and is often associated with a slowing of visible signs of skin ageing. Through its antioxidant properties, coenzyme Q10 can reduce the formation of free radicals and support the regeneration of stressed cells.
Coenzyme Q10 is being researched in relation to heart, muscle and skin health. People taking statins are often discussed as a group that may particularly benefit from maintaining Q10 levels.
Q10 and athletic performance
The significance of coenzyme Q10 for physical performance is an increasing focus of scientific studies. As an important component of the mitochondria, it plays a key role in energy generation and is therefore relevant for endurance, strength and recovery. In studies with athletes, regular intake of Q10 has been associated with improved oxygen utilisation and faster recovery times. The reason discussed is that the coenzyme helps stabilise energy production at the cellular level and supports the muscles in dealing with oxidative stress from free radicals.
During intensive training sessions, oxidative stress can build up in the body, placing strain on cells and organs. Ubiquinol – the active form of the coenzyme – functions as a strong antioxidant and can neutralise free radicals before they cause significant damage. In combination with vitamin E, this protective mechanism may be further supported. Studies suggest that coenzyme Q10 can help increase physical capacity and reduce perceived exhaustion during intense exertion.
Coenzyme Q10 supports cellular energy production and may benefit athletic performance and recovery. It also helps protect muscles from oxidative stress.
Dosage, intake and safety
The optimal dosage of coenzyme Q10 depends on individual factors such as age, diet and overall health. A daily intake of 100 to 300 mg is commonly referenced, with ubiquinol often taken in lower amounts because of its higher bioavailability. For people over 40 or those using statins, regular supplementation is sometimes considered.
To optimise absorption in the body, coenzyme Q10 is usually taken with a meal that contains some fat, as it is fat‑soluble. For capsule‑based products, the use of ubiquinol is often recommended to help ensure good availability.
In terms of safety, coenzyme Q10 is generally regarded as well tolerated. Only occasionally are mild side effects such as stomach discomfort, nausea or sleep issues reported. Studies indicate that even long‑term intake has not been associated with serious harm. Nevertheless, people with chronic conditions or those taking medication should seek medical advice in advance.
The commonly referenced Q10 dose is 100–300 mg daily, ideally with a meal containing fat. It is generally considered safe and well tolerated.
Q10 deficiency: symptoms and causes
A deficiency of coenzyme Q10 can manifest in various ways, as the coenzyme is needed for energy production in all cells of the body. Typical signs often reported in connection with a Q10 deficiency include chronic tiredness, difficulty concentrating, muscle weakness and reduced physical stamina. In older people, a deficit may also be associated with cardiovascular complaints, raised blood pressure or slower recovery.
The reasons for a reduced coenzyme Q10 level are varied. In addition to the natural decline with advancing age, certain medications – particularly statins – can influence the body’s own production. Other factors such as an unbalanced diet, chronic stress and oxidative damage caused by free radicals also play an important role. A long‑term deficiency can affect the entire organism, as less energy is available for vital processes.
The energy metabolism in the mitochondria is directly involved: if there is insufficient ubiquinone or ubiquinol, the efficiency of energy generation decreases, which is particularly noticeable in energy‑intensive organs such as the heart, liver and kidneys. Especially in older people, carefully considered supplementation may be used to help stabilise Q10 levels and support normal cell function.
A low Q10 status is often associated with tiredness, muscle weakness and reduced resilience. Ageing, stress and statins are key factors that can lower Q10 levels in the body.
Conclusion and frequently asked questions about coenzyme Q10
Coenzyme Q10 is an important component for the health of body cells and for efficient energy production. It functions as an antioxidant, helps counteract free radicals and supports the organism in regeneration processes. With increasing age or when certain medications are taken, levels in the body can decrease, which is why targeted supplementation in the form of capsules or liquid products is often considered.
People with increased energy demands – such as older adults, athletes or those with heart conditions – are frequently mentioned as groups that may appreciate regular intake of ubiquinol. Combining Q10 with vitamin E and vitamin C is also considered beneficial, as these vitamins can enhance the antioxidant properties of Q10. Nevertheless, any long‑term supplementation should be discussed individually with a doctor to avoid potential interactions.