L Carnitine Shows Promise as Supportive Therapy for Autism A clinical trial published in the journal Research in Autism Spectrum Disorders found that l carnitine supplementation may help reduce autism symptoms in children. The Medical treatment of autism spectrum disorder in children: Current evidence, controversies, and clinical challenges L Carnitine Linus Pauling Institute Oregon State University Frontiers Discovery and validation of acetyl L carnitine in serum for diagnosis of major depressive disorder and remission status through metabolomic approach