L Carnitine Injections Nuceria Health, Miami, FL Injectable L Carnitine for Slimming: Does It Really Work? National Medical Resources Inc Compounded Carnitine (L) Injection Empower Pharmacy L Carnitine is Underrated. New Meta Review Reminds Us Why. 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