When Should You Take L Carnitine? MuscleTech Liquid L Carnitine 3000: Metabolism & Energy Support Cutler Nutrition Cutler Nutrition Liquid L Carnitine Supplement with Acetyl L Carnitine & L Carnitine Tartrate Forms Pre Benefits of L Carnitine (especially for fitness enthusiasts):, Fat Metabolism Helps transport fatty acids into the mitochondria to be burned for energy., Improved Exercise Performance May enhance The Benefits (and Limitations) of L Carnitine for Fat Loss