Health Veda Organics L Carnitine L Tartrate, 1000mg Pre Workout Supp 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 Should I use L Carnitine on rest days or just before workouts? When to Take L Carnitine for Optimal Training Benefits Transparent Labs Protein + Carnitine Recovery 8000 EC Sports Supplements