How to Inject L Carnitine for Weight Loss Safely How To Give A Subcutaneous Injection And Sites The HCG Institute 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 draw up and give yourself a subcutaneous injection Subcutaneous Injection: What It Is and How to Give One