L carnitine, Pre Workout & Ripped Protein Dumbell Wellness 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 Should I use L Carnitine on rest days or just before workouts? L Carnitine helps convert fat into usable energy, making it ideal before workouts or active days. Combined with ACV for added metabolism support. . . . . . . . . . #WorkoutFuel #LCarnitine #FitnessSupport #Vitallfizz