Some of the dangers of using coenzyme Q-10 include risk of bleeding, skin rashes and itching, vomiting, and upset stomach, explains Mayo Clinic. Coenzyme Q-10 might also cause low or high blood pressure, reports WebMD.
Coenzyme Q-10 is likely effective for improving the symptoms of coenzyme Q-10 deficiency, a rare condition characterized by fatigue and weakness, notes WebMD. It may also help treat acquired or inherited disorders that limit cell production of mitochondrial disorders. Other possible uses for this supplement include improving age-related vision loss, congestive heart failure, nerve damage due to diabetes and immune function in people suffering from HIV/AIDS.