Coenzyme Q10 (CoQ10 or ubiquinol) is an antioxidant which helps to generate energy in human’s cells and may prevent cellular damage linked with aging and some diseases. Naturally occurring CoQ10 is produced by your body, but as you become older, less of it is produced.  Thankfully, you can also acquire CoQ10 from diet or supplements. Low levels of CoQ10 have been linked to severe diseases.