L Carnitine Injections: A Clinical Guide for Practitioners National Medical Resources Inc 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 Injectable L Carnitine: What It Is, How It Works, and Who Should Use It Mesotherapy Cocktails, Exosomes Regenerative Skin Boosters LEVOCARNITINE INJECTION, USP1 g per 5 mL vial and 4 g per 20 mL vialFOR INTRAVENOUS USE ONLYRx Only CARNITOR Levocarnitine Injection (L Carnitine) 200 mg mL, Single Dose Vial 5 mL, 5 Tray