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 Linus Pauling Institute Oregon State University Best Time to Take L Carnitine: Morning vs Evening for Better Fat Loss & Performance L Carnitine Injections Nuceria Health, Miami, FL L Carnitine Injections: A Clinical Guide for Practitioners National Medical Resources Inc L Carnitine Injection: Maximize Fat Burning, Energy & Metabolism