Can Lcarnitine be used as a treatment for a child with autism spectrum disorder (especially if a metabolic or mitochondrial abnormality is suspected), and what dosing and safety monitoring are recommended? ACETYL L CARNITINE Neuroneeds 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 Frontiers Gut microbiota and autism spectrum disorder: advances in dietary intervention strategies based on the microbiota gut brain axis mechanism Autism Supplements Vitamins for Kids