Original article: THE EFFECTS OF L CARNITINE SUPPLEMENTATION ON GLYCEMIC CONTROL: A SYSTEMATIC REVIEW AND META ANALYSIS OF RAN L Carnitine Injections: What You Should Know , L Carnitine is not a fat burner its a metabolic support tool., Its role is to help transport fatty acids into the mitochondria, where theyre 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 has become one of the most commonly asked about supplements over the past 18 months and I can see why when looking at all the research that has come out about it over the last 2ish years., L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe