L Carnitine Linus Pauling Institute Oregon State University The Role of L Carnitine in Kidney Disease and Related Metabolic Dysfunctions 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 Acetyl L Carnitine is more thought of as a fat burner. It's actually powerful tool for athletes looking to improve endurance, energy, and mental performance. Here's how you can integrate it into your routine for GAT SPORT L CARNITINE