An L-Carnitine Injection is a fat burning supplement that is injected into someone with the supervision of a Bariatric Medicine Expert at Medarts Weight Loss Specialists. Do not administer yourself an L-Carnitine Injection without the supervision of a trained professional. This injection is best for people trying to get lean and lose fat, as L-Carnitine works to move fatty-acids in the body such aa triglycerides into mitochondria, where they are turned into energy.