L Carnitine Injection Benefits and Safety Levocarnitine Injection: Package Insert Prescribing Info L Carnitine Oral Bioavailability NOW l Carnitine Supplement Injectable L Carnitine for Slimming: Does It Really Work? National Medical Resources Inc ORAL VS. INJECTABLE L CARNITINE , Does it really matter which you use? , Both have pros and cons but it really comes down to what is going to be most suited to use as an individual athlete.,