When to take L carnitine: Dosage, forms, and side effects 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 Research Breakdown on L Carnitine Examine L Carnitine is Underrated. New Meta Review Reminds Us Why. The Role of l Carnitine in Mitochondria, Prevention of Metabolic Inflexibility and Disease Initiation Role of carnitine in disease Nutrition & Metabolism Springer Nature Link