Early research into L carnitine was often cited as underwhelming, showing negligible changes in muscle carnitine content and fat loss outcomes. However, these findings may have been limited by a short study window What is the recommended duration of carnitine (L carnitine) supplementation? CoQ10 and L Carnitine: Benefits, Dosage and Safety Guide Bolt Pharmacy Healthy 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