L Carnitine Injections: A Clinical Guide for Practitioners National Medical Resources Inc Frontiers Dietary L carnitine supplementation modifies blood parameters of mid lactating dairy cows during standardized lipopolysaccharide induced inflammation 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 Levocarnitine Injection: Package Insert Prescribing Info