Combining L Carnitine with Pre Workout for Effective Fat Loss Taking a preworkout AND carnitine? It is important to get the timing of each supplement right to get the best results with both. Watch as Phil explains the best way to combine them. , #preworkout When to Take L Carnitine for Weight Loss & Maximize Results Liquid L Carnitine supports fat metabolism and energy production by helping your body turn stored fat into usable fuel. Fast absorbing, stimulant free, and zero sugar or calories, it's a great pre workout option to boost Liquid L Carnitine 3000: Metabolism & Energy Support