JYM L Carnitine L Tartrate L Carnitine Liquid 3300mg for Weight Loss: Does It Work? Alvista Official L Carnitine Before or After Workout Which Is Better for Fat Loss ? When Should You Take L Carnitine? MuscleTech Should I use L Carnitine on rest days or just before workouts? L carnitine 15ML (25minutes before workout)Pre workout 25minutes before workout 1 recommended scoop .Step 1 : Add L carnitine supplements before workoutStep 2: Add cardio after workout 15 30 minutes