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 Acetyl L Carnitine (ALCAR) Supplement for Horses Mad Barn l Carnitine Supplementation in Recovery after Exercise Evaluation of the effects of L carnitine on medaka (Oryzias latipes) fatty liver Scientific Reports