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 L Carnitine Benefits: A Complete Research Based Guide The Role of L Carnitine in Kidney Disease and Related Metabolic Dysfunctions L Carnitine Side Effects & Safety: A Complete Guide The Science of Good Health Taking L carnitine, will it improve endurance and recovery?