L Carnitine for Blood Sugar Support Improve Insulin Sensitivity Naturally L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe Most nerve supplements look impressive on the label. Until you compare the doses to what the clinical trials actually used. As a Fellowship Trained Peripheral Nerve Surgeon with 3,000+ nerve procedures, here is L Carnitine: Benefits, Side Effects, FAQ, Sources, and Dosage