PROLAB L-Carnitine, the super-convenient way to load with a potent dose of L-Carnitine. L-Carnitine is an amazing amino acid that plays a critical metabolic role. It works to transport fat into the body's fat burning factories the mitochondria. In simple terms, L-Carnitine funnels fats into skeletal muscle cells to be consumed for fuel to help support optimal athletic potential. Better yet, clinical research has shown that L-Carnitine helps reduce muscle soreness associated with muscle damage from high-intensity exercise.