CoQ10 is also produced in the human body and up until a certain point follows the same production course as cholesterol. CoQ10 exists in large quantities in areas of high activity in the body, as it is a substance that is related to production of energy. The CoQ10 concentration in the tissues decreases with age. If we set the level of CoQ10 in the heart at the age of 20 as 100%, this level will have dropped to 42.9% by the age of 80.