Injectable carnitine vs oral version comparison? What are the effects and side effects of using L Carnitine IM? L Carnitine Oral Bioavailability NOW l Carnitine Supplement Injectable L Carnitine > Oral L Carnitine BUT do you REALLY need it?, , I dont think so., , L Carnitine is a medicine often prescribed by doctors to patients with heart issues., , In theory, it L Carnitine is often marketed as a fat burner, but most people dont realize that oral and injectable L Carnitine are not the same..Oral L Carnitine has poor absorption (only 20% bioavailability), L Carnitine con Alcachofa 12g