Revisiting the Role of Carnitine in Heart Disease Through the Lens of the Gut Microbiota L Carnitine Linus Pauling Institute Oregon State University Your body already makes L Carnitine, so why do people take it as a supplement? Because while it helps burn fat for energy, it only works when paired with the right lifestyle., So before you jump on L Carnitine: Benefits, Side Effects, FAQ, Sources, and Dosage