Subcutaneous Injection: What Is It and How to Give One Ro Compounded Carnitine (L) Injection Empower Pharmacy 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 How to Inject L Carnitine for Weight Loss Safely How To Give a Subcutaneous (SubQ or SQ) Injection OncoLink