The Effect of L Carnitine on Critical Illnesses Such as Traumatic Brain Injury (TBI), Acute Kidney Injury (AKI), and Hyperammonemia (HA) L Carnitine Benefits for Chronic Fatigue Syndrome Kids and teenagers may lean on energy drinks and caffeine to charge their day, but is it safe for their health? Michael Garcia, MD, a clinical nutritionist at UCLA Health, shares the L Carnitine is Underrated. New Meta Review Reminds Us Why.