L Carnitine: Benefits, Side Effects, FAQ, Sources, and Dosage Frontiers Association between fatigue, peripheral serotonin, and L carnitine in hypothyroidism and in chronic fatigue syndrome Meet L Carnitine a naturally occurring amino acid that plays a key role in helping the body convert fat into usable energy. It works by transporting fatty acids into your cells to Meet L Carnitine a naturally occurring amino acid that plays a key role in helping the body convert fat into usable energy. It works by transporting fatty acids into your cells to Does L Carnitine Work for Fat Loss? A Dietitian Explains Top 5 Benefits of CoQ10 and L Carnitine Combination for Athletes iThrive Essentials