What is L Carnitine, L Carnitine is an amino acid that plays a role in energy production and fat metabolism. Its found in foods like red meat, fish, and dairy, and also available as a supplement., L Carnitine Injections: A Clinical Guide for Practitioners National Medical Resources Inc L Carnitine Injections: A Clinical Guide for Practitioners National Medical Resources Inc Injectable L Carnitine for Slimming: Does It Really Work? National Medical Resources Inc Austin Hodges IFBB PRO L Carnitine is often marketed as a fat burner, but most people don't realize that oral and injectable L Carnitine are not the same. . Oral Instagram