Role of carnitine in disease Nutrition & Metabolism Springer Nature Link Supplements don't replace the workbut they can support it L Carnitine helps your body turn fat into usable energy, so you can push harder and recover better. Consistency first. Supplements second. Results L carnitine is an amino acid that is produced in your body that helps the body turn fat into energy. Carnitine is found in nearly all cells of the body and researchers have Carnitine: Genetic Variants Affecting Mitochondrial Energy and Health L Carnitine vs Fat Burner Powders: Which Is Safer for Weight Loss?