When to take L carnitine: Dosage, forms, and side effects Role of carnitine in disease Nutrition & Metabolism Springer Nature Link L Carnitine is Underrated. New Meta Review Reminds Us Why. Frontiers The Effects of L Carnitine, Acetyl L Carnitine, and Propionyl L Carnitine on Body Mass in Type 2 Diabetes Mellitus Patients Research Breakdown on L Carnitine Examine 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