Coenzyme Q10 helps to maintain a healthy cardiovascular system, and benefits patients with cardiovascular disease, with benefits for hypertension, hyperlipidaemia, coronary artery disease and heart failure, and treatment with lipid lowering statin drugs. Coenzyme Q10 promotes normal immune function (cells involved in immune response have a high energy dependence), and benefits patients with breast cancer.Coenzyme Q10 inhibits the development of periodontal disease. Coenzyme Q10 benefits patients with Parkinson's disease.Coenzyme Q10 (also known as ubiqinone) is a vitamin like substance which plays a vital role in the body's energy supply mechanism, acting in conjunction with enzymes (hence the name coenzyme Q10) to convert sugars and fat into energy. Coenzyme Q10 is also important as an antioxidant within the body. Coenzyme quinones occur in several chemical forms, with coenzyme Q10 being the only form found in human tissues. The human body is able to synthesize (in the liver) a limited amount of coenzyme Q10, with the remainder being obtained from the diet. Rich sources of coenzyme Q10 include fish (mackerel, salmon, sardines) and nuts. Under normal circumstances, the body is able to maintain adequate levels of coenzyme Q10. However, coenzyme Q10 levels decrease with age, and are depleted by intense physical exercise or illness.