L Carnitine 3000 Powder Cherry Lime L Carnitine vs Acetyl L Carnitine: Which is Better Pre Train Elite Superior Supplement Products Science First Designs for Health 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 Does anyone recommend any good pre workout L carnitine liquid supplements that gives you a massive pump during workouts and a good energy boost