According to a randomized, double blind, placebo controlled clinical trial published in Elsevier journal Research in Autism Spectrum Disorders (2013), l carnitine supplementation demonstrated a significant therapeutic benefit in children diagnosed with Unique acyl carnitine profiles are potential biomarkers for acquired mitochondrial disease in autism spectrum disorder Translational Psychiatry Comprehensive review of the expanding roles of the carnitine pool in metabolic physiology: beyond fatty acid oxidation Journal of Translational Medicine Springer Nature Link L Carnitine Linus Pauling Institute Oregon State University Effects of L Carnitine Supplementation on the Rate of Weight Gain and Biomarkers of Environmental Enteric Dysfunction in Children with Severe Acute Malnutrition: A Double Blind Randomized Controlled Clinical Trial ScienceDirect