Frontiers The effect of L carnitine supplementation on lipid profile in adults: an umbrella meta analysis on interventional meta analyses L Carnitine Force Factor Systemic regulation of L carnitine in nutritional metabolism in zebrafish, Danio rerio Scientific Reports 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