Should I use L Carnitine on rest days or just before workouts? The Right Way to Take L Carnitine to Boost Your Training L Carnitine Before or After Workout Which Is Better for Fat Loss ? 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 Is L Carnitine safe for athletes at doses up to 6000 mg day? Consensus