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 Are L Carnitine Injections Used For? L Carnitine Linus Pauling Institute Oregon State University A Guide to L Carnitine on Keto Keto Nutrition L Carnitine Injection Levocarnitine IV