To support heart muscle health. use CoQ10 50 mg 50 softgels by NOW. In each softgel. the manufacturer has included 50 milligrams of Coenzyme Q10. also known as CoQ10 or ubiquinone. NOW has also added selenium and vitamin E. CoQ10 is essential to the mitochondrial processes and to supporting the immune system. It has also been linked to strengthening heart muscle tissue.