Coenzyme Q10 (CoQ10) is a substance similar to a vitamin. It is found in every cell of the body. Your body makes CoQ10, and your cells use it to produce energy your body needs for cell growth and maintenance. It also functions as an antioxidant, which protects the body from damage caused by harmful molecules. CoQ10 is naturally present in small amounts in a wide variety of foods, but levels are particularly high in organ meats such as heart, liver, and kidney, as well as beef, soy oil, sardines, mackerel, and peanuts.
Coenzymes help enzymes work to digest food and perform other body processes, and they help protect the heart and skeletal muscles.
Heart failure is a condition in which the heart can't pump blood effectively to the lungs or the rest of the body.
This can be because the person has developed a weakened heart muscle or because the heart muscle has thickened or stiffened, making it difficult to fill the heart and backing up blood into the lungs.
With heart failure, the weakened heart pumps less blood than usual, causing the kidneys and adrenal glands to produce chemicals that help the body to hold onto salt and water.
If you have heart failure, talk to your doctor before you take any supplement. There's no strong evidence that vitamins or other supplements can help treat heart failure. They are used along with medical heart failure treatments, not instead of treatment.
But you may still hear about CoQ10 supplements and heart failure. CoQ10 has not been shown definitely to relieve heart failure symptoms. Only some of the studies of coenzyme Q10 showed that it helps heart failure symptoms.1