Is L Carnitine Safe? Watch FIRST BEFORE Taking L Carnitine Supplements L Carnitine Injection Levocarnitine IV Frontiers Association between fatigue, peripheral serotonin, and L carnitine in hypothyroidism and in chronic fatigue syndrome 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 The mechanism of action, side effects and clinical application of L carnitine The supplementation of L carnitine in septic shock patients: Systematic review and meta analysis Clinics