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 When to Take L Carnitine for Optimal Training Benefits Transparent Labs When to take L carnitine: Dosage, forms, and side effects Does anyone recommend any good pre workout L carnitine liquid supplements that gives you a massive pump during workouts and a good energy boost