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 Amazon.com: NATURAL STACKS Dopamine Brain Food 650mg L Tyrosine Supplement Dopamine Supplement for Focus & Mental Drive Supports Mental Energy Neurotransmitter Support with B Vitamins 60 Capsules : Health & Household l carnitine: Nutrition, pathology, and health benefits ScienceDirect Acetyl L Carnitine via Upegulating Dopamine D1 Receptor and Attenuating Microglial Activation Prevents Neuronal Loss and Improves Memory Functions in Parkinsonian Rats : r Nootropics PDF) Distinct effects of ketamine and acetyl L carnitine on the dopamine system in zebrafish