Does L Carnitine Really Work? An Honest Guide The Science of Good Health 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 Effect of chronic L carnitine supplementation on carnitine levels, oxidative stress and apoptotic markers in peripheral organs of adult Wistar rats ScienceDirect L Carnitine Dietary Supplement Therapy Weight Loss Vitality Systemic regulation of L carnitine in nutritional metabolism in zebrafish, Danio rerio Scientific Reports Carnitine: the claims and why it may not work