L Carnitine Injections: A Clinical Guide for Practitioners National Medical Resources Inc L carnitine is an amino acid derivative that plays a crucial role in the bodys energy production processes. As an injectable supplement, L carnitine has been employed to support various health Injectable L Carnitine 500mg ml (20ml) : Amazon.ca: Health & Personal Care 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