Propionylcarnitine is primarily used in the field of medicine and health due to its role in metabolic processes. It is often utilized as a supplement to support energy production, particularly in individuals with metabolic disorders or deficiencies in carnitine. This compound aids in the transportation of fatty acids into mitochondria, where they are converted into energy, making it beneficial for those experiencing fatigue or muscle weakness. Additionally, it has been studied for its potential in improving cardiovascular health by enhancing blood flow and reducing oxidative stress. In clinical settings, it is sometimes administered to patients with conditions like peripheral arterial disease or heart failure to improve exercise tolerance and overall quality of life. Research also suggests its application in managing symptoms of certain neurological disorders, as it may support brain function and reduce inflammation.