L Carnitine Injection vs. Oral Supplements: Which is More Effective? Katalyst Wellness L Carnitine Injectable Factor Health MD L Carnitine Injection Levocarnitine IV L CARNITINE HCL 2000mg 5ml at 168 piece L Carnitine Injection in Nagpur ID: 2855005232648 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 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