L Carnitine: Benefits, Side Effects, Sources, and Dosage iMuscles Nutrition When to Take L Carnitine for Weight Loss & Maximize Results 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 Supercharge Your Day with L Carnitine: Boost Your Routine iron asylum in L Carnitne, good to take when you want to burn calories and when losing weight. Very important in fat loss Take responsibly #L carnitine #gym #workouts #fat loss