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 Linus Pauling Institute Oregon State University How Much L Carnitine Should I Take? A Guide The Science of Good Health Carnitine: the claims and why it may not work 5 Health Benefits of L Carnitine