If the bad heart is viral myocarditis, chronic cardiac insufficiency and other cardiovascular diseases, you can use coenzyme Q10 after excluding contraindications under the guidance of a doctor. Coenzyme Q10 is a nutritive myocardium and improve myocardial metabolism drug, mainly used in the adjuvant treatment of some diseases, such as viral myocarditis, chronic cardiac insufficiency and other cardiovascular diseases; viral hepatitis, subacute hepatic necrosis, chronic active hepatitis; also can be used in the comprehensive treatment of cancer, to reduce some of the adverse reactions caused by radiotherapy, chemotherapy and so on. If the bad heart belongs to the above indications, and exclude allergy to the product, generally follow the doctor’s instructions to use, but not blindly self-administered. Note that some adverse reactions may occur after taking the drug, such as nausea, vomiting, diarrhea, etc., and very individuals may also experience allergic symptoms such as skin rash.