Liquid L CARNITINE vs INJECTION l carnitine GNC L CARNITINE Honest Review L Carnitine Injection Products list Products Ceva Australia Injectable L Carnitine: Does It Really Work for Fat Loss? 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 vs Oral L Carnitine: Which Works Better? AWP L carnitine supplements bioavailability is very less and according to some studies it takes 8 to 12 weeks for for loss results, so if you decide to supplement with oral L carnitine