How to Self Administer Subcutaneous & Intramuscular Injections 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: What It Is and How to Give One L Carnitine Lipolysis Vials Professional Fat Burning & Body Contouring Mesotherapy SlimSpa SlimSpaOnline L Carnitine Injections: A Clinical Guide for Practitioners National Medical Resources Inc