Subcutaneous Injection: What It Is and How to Give One 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 L CARNITINE Dermaqual L Carnitine Injection (Intramuscular): How It Works & What to Expect Mesotherapy Cocktails, Exosomes Regenerative Skin Boosters Subcutanous injection self administration South Tees Hospitals NHS Foundation Trust Image showing the pinch technique to ensure drug delivery into Download Scientific Diagram