Health Veda Organics L Carnitine L Tartrate, 1000mg Pre Workout Supp 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 Amazon.com: iSatori L Carnitine LS3 3000, Liquid L Carnitine with Acetyl L Carnitine, L Carnitine L Tartrate, Stimulant Free Pre Workout, Low Calories, Sugar, Gluten, Keto Friendly, Bombsicle Flavor (32 Servings) : Health & Household L Carnitine as Pre Workout Supplement: Guide The Science of Good Health