Supplements don't replace the workbut they can support it L Carnitine helps your body turn fat into usable energy, so you can push harder and recover better. Consistency first. Supplements second. Results Creatine Vs Carnitine Which Pre workout Supplement To Choose? AS IT IS Nutrition L carnitine 15ML (25minutes before workout), Pre workout 25minutes before workout 1 recommended scoop ., Step 1 : Add L carnitine supplements before workout, Step 2: Add cardio after workout 15 30 Losing weight with L carnitine supplements. Yes or no?