L Carnitine Injection Levocarnitine IV l carnitine: Nutrition, pathology, and health benefits ScienceDirect L Carnitine injection is recommended at 1 ampule every 2 3 days for best results. The L Carnitine is taken intravenously either by normal injection or using a butterfly needle. After taking this L Carnitine, you L Carnitine Benefits: A Complete Research Based Guide What Is Carnitine and Why Is It Important? The Amino Company