Proper CoQ10 dosages for normal adults generally range between 22 to 400 milligrams, according to Mayo Clinic. Coenzyme Q10, or CoQ10, is an antioxidant that occurs naturally in the body.
Coenzyme Q10 is necessary for basic cell function, explains Mayo Clinic. Coenzyme Q10 levels decrease naturally with age, and may be decreased in individuals with cancer, diabetes, HIV, AIDS and genetic disorders. In addition, heart conditions, muscular dystrophies, Parkinson's disease and certain prescription medications can lower Coenzyme Q10 levels. Coenzyme Q10 can be taken in supplement form, but the research suggesting Coenzyme Q10 supplements are an effective treatment for conditions is conflicting.