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 Autism and Biomedical Interventions Above and Beyond Therapy Acetyl l carnitine alleviates valproate induced autism like behaviors through attenuation of hippocampal mitochondrial dysregulation ScienceDirect Frontiers Gut microbiota and autism spectrum disorder: advances in dietary intervention strategies based on the microbiota gut brain axis mechanism