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 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: Benefits, Side Effects, FAQ, Sources, and Dosage Applied Nutrition L Carnitine 3000mg Liquid Fruit Burst 480ml H&B Role of L carnitine in exercise training: Anti inflammatory, antioxidant, and metabolic interactions ScienceDirect