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: Helping Prevent Diabetes During Pregnancy Acetyl L Carnitine Supplement: Uses, Benefits, Side Effects, Dosage, A Welltopia Pharmacy Frontiers The effects of L carnitine supplementation on glycemic markers in adults: A systematic review and dose response meta analysis