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 Volcarn 2000 L Carnitine & GBEEC Supplement, Support Weight Loss L Carnitine as Pre Workout Supplement: Guide The Science of Good Health Should I use L Carnitine on rest days or just before workouts?