Q10’s importance for the brain and cognitive abilities

Q10 is a unique molecule that is involved both in the cells’ energy metabolism and in protecting cells against damage caused by oxidative stress. This means that the busy brain and vulnerable nerve cells require a fair amount of Q10. However, the body’s own synthesis of Q10 gradually declines with age and with the intake of cholesterol-lowering statins. According to a review article published in Nutrients, Q10 supplementation appears to improve brain health and cognitive abilities. One should choose pharmaceutical-grade Q10 supplements to ensure good bioavailability, so that the Q10 molecules reach the brain and other organs.

As the number of elderly people increases in the Western world, the prevalence of cognitive decline and dementia is also on the rise. This has serious consequences for the affected individuals, their relatives, and the economy. Under normal circumstances, the brain and nervous system work together to carry out cognitive functions such as thinking, learning, memory, and language. Billions of nerve cells cooperate in a complex network, and the hippocampus plays an overarching role in memory, spatial perception, and responses to stress states such as anxiety and anger.
Overall, cognitive decline is caused by a number of metabolic and physiological changes in the brain, which may result from:

• Impaired cellular energy metabolism, which increases the production of free radicals as a byproduct
• Oxidative stress, where free radicals attack cholesterol, cells, and tissues
• Chronic inflammation, which is part of many chronic diseases, and is also referred to as “inflammaging”
• Reduced blood flow in the brain

Here, coenzyme Q10 plays a central role, as it is involved in the cells’ production of energy (ATP), which takes place inside the mitochondria. Q10 also functions as a unique antioxidant that protects cells and tissue from damage caused by free radicals and oxidative stress.
The body synthesizes most of the Q10 for its own needs, but the endogenous production gradually declines after the age of 20. Many people notice this after the age of 50 in the form of reduced vitality. Cholesterol-lowering statins, alendronate for osteoporosis, and certain mitochondrial diseases also inhibit the endogenous Q10 synthesis. Although the declining endogenous production of Q10 is not directly noticeable, the cells (including nerve cells) become more vulnerable to damage caused by free radicals and oxidative stress.
Q10 supplementation has shown promising results in several studies regarding the improvement of mechanisms that counteract aging processes, but it has been less clear whether Q10 can improve cognitive functions in the elderly. The researchers behind the new review article therefore investigated this more closely. For this purpose, they collected a number of clinical studies conducted on animals and humans, who were either healthy or had specific diseases. The review article revealed the following positive effects of Q10 supplementation:

• 12 of the studies showed an improvement in cognitive functions
• Two of the studies showed a reduction in oxidative stress
• Out of eight studies on healthy individuals and patients, four studies showed a positive effect on cognitive abilities, and two studies showed an improvement in cerebral blood flow
• The researchers therefore conclude that Q10 supplementation as therapy can improve cognitive functions through various biological mechanisms.

Quality and dosage of Q10 supplements are crucial

According to the new review article, studies have also shown varying results regarding Q10’s effect on cognitive functions in the elderly. Here, it is important to note that the quality of a Q10 product is decisive. This is because Q10 molecules in raw form tend to clump together as crystals, which are unable to pass through the intestinal membrane and reach the bloodstream. A special oil and heat technique is therefore required, as it dissolves the Q10 crystals into free Q10 molecules. Leading researchers therefore recommend pharmaceutical-grade Q10 preparations that have documentation of high absorption and bioavailability. Dosage also affects the outcome, and in many studies 200 mg per day has typically been administered. In the case of mitochondrial diseases or chronic inflammation, the required dose may be even higher. Since we can only absorb 100 mg of Q10 at a time, high-dosed supplements should be divided to achieve better utilization.

Other advice for preventing cognitive decline

As mentioned, the brain has a high energy metabolism, and at the same time, nerve cells, the hippocampus, and other parts of the brain need specific nutrients to support various metabolic processes. In the following article, you can read more about how exercise, as well as vitamin B12, omega-3 fatty acids, and selenium, are also crucial for brain health, neuroplasticity, and the formation of new nerve cells.

»Exercise and three nutrients improve neuroplasticity«

References:

Madeleine C Nankivell et al. Coenzyme Q10 and Cognition: A Review. Nutrients 2025