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 Subcutaneous Injection Sites and Instructions for Safe Self Administration Subcutaneous Injection: What It Is and How to Give One Lipo shots. B12 injections. L Carnitine. OH MY They're everywhere. But what does the research actually say? As a medical provider, I owe my patients the facts not false promises. Let's