Inhaltsstoff-Glossar

Q-10

What Is Coenzyme Q10?

Coenzyme Q10 is also known as ubiquinone-10, ubiquinone, or Q10. It is a molecule that is essential for the function of numerous proteins. It can be thought of as an electron carrier for larger proteins, as it transports electrons and protons between proteins that generate energy from the food we consume. Since humans produce approximately 95% of their energy through this process, Q10 has become a major focus of scientific research. In particular, researchers are investigating Q10 deficiency and the effects of Q10 supplementation. Scientists are also examining whether Q10 supplementation may be beneficial in the treatment and prevention of conditions such as heart attack, stroke, and Parkinson's disease.

Where Does Coenzyme Q10 Naturally Occur?

Q10 possesses a fat-soluble (lipophilic) side chain. This enables the quinone derivative to position itself precisely where it is needed to perform its function as an electron carrier. It anchors itself within the mitochondrial membrane—the membrane of the cell's powerhouses. Every cell in the human body contains mitochondria, which convert fatty acids and glucose into usable energy.

Q10 is an endogenous substance produced naturally by the body. Although we also obtain it through food, this contribution is relatively small. Assuming the body requires approximately 500 mg of Q10 per day, only about 5 mg—or roughly 1%—is supplied through the diet. Organs with the highest energy demands also contain the highest concentrations of Q10, including the heart, brain, muscles, and lungs. On a per-gram basis, the liver contains the highest concentration of Q10 and appears to be the primary site of Q10 biosynthesis.

Q10 supplementation has attracted considerable interest because reduced Q10 concentrations in the blood and cells are associated with various diseases. The reasons for impaired production or deficiency are not yet fully understood. What is well established, however, is that the body's Q10 production peaks at around 25 years of age and declines by approximately 50% by the age of 65.

What Is the Primary Function of Coenzyme Q10 in the Body?

Coenzyme Q10 is an essential component of the respiratory chain. It is called the respiratory chain because the process depends on oxygen, and a chain because it consists of a sequence of reactions that occur one after another. More specifically, it is an electron transport chain in which electrons are transferred to ultimately produce adenosine triphosphate (ATP), the body's universal energy currency. Q10 functions as the molecule that transfers electrons between individual reactions within this chain.

In simplified terms, mitochondria use the respiratory chain to convert glucose into carbon dioxide, water, and energy (ATP) with the help of oxygen. This process explains why we inhale oxygen and exhale carbon dioxide. The respiratory chain therefore converts energy from food into biologically usable energy in the form of ATP. Q10 transfers this energy between two consecutive steps of the chain.

As remarkable as the respiratory chain is, it also produces reactive oxygen species (ROS) as by-products. These free radicals oxidize cellular components such as membranes and DNA, causing oxidative damage. ROS are the reason antioxidants such as vitamin C and vitamin E are so important. Antioxidants reduce oxidative stress by neutralizing these reactive molecules before they can damage sensitive cellular structures. In doing so, they help prevent the accumulation of damage that may ultimately contribute to disease.

Q10 also plays a vital role in this process. It helps protect mitochondrial membranes and the proteins embedded within them from oxidative damage. Thus, Q10 is not only essential for efficient energy metabolism but also serves as an important antioxidant. In addition, it helps regenerate other antioxidants after they have been oxidized and used by the body.

What Are the Benefits of Coenzyme Q10 Supplementation?

Studies have shown that individuals with certain diseases and health conditions often exhibit low blood levels of Q10. These conditions include type 2 diabetes, cardiovascular diseases, and neurodegenerative disorders such as Alzheimer's disease and Parkinson's disease. Other factors associated with reduced Q10 levels include smoking and physical inactivity. Declining Q10 concentrations have also been linked to biological aging, muscle loss, and reduced muscle function.

These observations have led to the hypothesis that Q10 supplementation may be beneficial both for treating existing diseases and for helping to prevent the development of various health conditions. Today, sufficient randomized controlled clinical trials are available in several areas, allowing researchers to systematically investigate the role of Q10—particularly supplemental Q10—in human health.

Authors of several meta-analyses have reported evidence supporting beneficial effects of Q10 supplementation. Positive outcomes have been observed with regard to longevity, muscle function, and inflammatory markers. Q10 has also shown potential in reducing fatigue associated with disease or medication side effects, as well as in conditions such as Parkinson's disease, migraine, and acute heart failure.

However, recommendations are often differentiated according to individual circumstances. It is considered highly likely that people diagnosed with Q10 deficiency syndrome or with confirmed low Q10 levels benefit from supplementation. Whether otherwise healthy individuals without a history of Q10 deficiency also benefit remains less clear. Ongoing clinical trials with improved study designs and larger participant populations are expected to provide more definitive answers.