A 2016 study suggested L carnitine could drop a key cardiovascular risk marker by up to 12%, which sounded promising at first., But follow up research told a more complicated story, with inconsistent PDF) Effect of Acute and Chronic Oral L Carnitine Supplementation on Exercise Performance Based on the Exercise Intensity: A Systematic Review l Carnitine pretreatment ameliorates heat stress induced acute kidney injury by restoring mitochondrial function of tubular cells American Journal of Physiology Renal Physiology American Physiological Society L Carnitine Prevents Progression of Non Alcoholic Steatohepatitis in a Mouse Model with Upregulation of Mitochondrial Pathway PLOS One The Role of l Carnitine in Mitochondria, Prevention of Metabolic Inflexibility and Disease Initiation