Frontiers Association between fatigue, peripheral serotonin, and L carnitine in hypothyroidism and in chronic fatigue syndrome L Carnitine Injection Levocarnitine IV The Role of L Carnitine in Kidney Disease and Related Metabolic Dysfunctions The effect of l carnitine supplementation on mortality and clinical outcomes in ventilator dependent critically ill patients with obesity and COVID 19: Protocol for a randomized double blind placebo controlled trial ScienceDirect Is L Carnitine safe for athletes at doses up to 6000 mg day? Consensus