Injectable L Carnitine How It Works & What to Expect? CARNITOR (levocarnitine) Injection 1 g per 5 mL vial For Intravenous Use Only. L Carnitine Injection Levocarnitine IV 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 Assessing the In Vitro and In Vivo Performance of L Carnitine Loaded Nanoparticles in Combating Obesity Role of carnitine in disease Nutrition & Metabolism Springer Nature Link