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 PDF) The Importance of the Fatty Acid Transporter L Carnitine in Non Alcoholic Fatty Liver Disease (NAFLD) Frontiers Role of Carnitine in Non alcoholic Fatty Liver Disease and Other Related Diseases: An Update When to take L carnitine: Dosage, forms, and side effects