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, Sources, and Side Effects Amazon.com: Benevolent L Carnitine Supplement High Potency 1500mg L Carnitine Tartrate Fast Absorbing, Convert Fat to Energy, Support Lean Muscle, Boost Workout Performance & Metabolism 120 Vegan Capsules : Health & Household What is the optimal acetyl l carnitine dosage? (L Carnitine)