What is CoQ10? Coenzyme Q10, or CoQ10, is naturally made by our bodies and found within every cell of the human body. It is a substance similar to that of a vitamin and our cells use it to produce the energy needed for cell maintenance and production. As it functions as an antioxidant, CoQ10 can protect the body from damage caused by harmful molecules. Additionally, CoQ10 can boost energy and speed up the recovery time from intense endurance efforts.