Losing weight with L carnitine supplements. Yes or no? L Carnitine Side Effects & Safety: A Complete Guide The Science of Good Health Acetyl L Carnitine: Benefits and Side Effects Gene Food How Much Carnitine? Book Excerpt of the Week GEG Research and Consulting 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