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 Systemic regulation of L carnitine in nutritional metabolism in zebrafish, Danio rerio Scientific Reports L Carnitine Dietary Supplement Therapy Weight Loss Vitality Carnitine: the claims and why it may not work Benefits of L Carnitine for PCOS Landys Chemist