L Carnitine Before or After Workout Which Is Better for Fat Loss ? Oxyenergys L Carnitine. My go to pre post workout supplement. Pre workout I usually take it before my workout session for energy production. Post workout Ill take it the day after my workout How to Take L Carnitine Correctly to Boost Your Training Healthfarm Healthfarm Nutrition L carnitine 15ML (25minutes before workout), Pre workout 25minutes before workout 1 recommended scoop ., Step 1 : Add L carnitine supplements before workout, Step 2: Add cardio after workout 15 30 How to Take L Carnitine Correctly to Boost Your Training Bodybuilding.com