Bonusan Acetyl L Carnitine 500 L Carnitine XS 4000, Orange Creamsicle, 15.72 fl oz (465 ml) 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 The bright and the dark sides of L carnitine supplementation: a systematic review Journal of the International Society of Sports Nutrition Springer Nature Link L Carnitine #1 Non Stimulant Fat Burner