Safety and efficacy of L carnitine supplementation in improving cardiac function of hemodialysis patients: a systematic review and meta analysis International Urology and Nephrology Springer Nature Link Frontiers Gut Microbiota: A Novel Regulator of Cardiovascular Disease and Key Factor in the Therapeutic Effects of Flavonoids Targeting Skeletal Muscle Dysfunction With L Carnitine for the Treatment of Patients With Chronic Obstructive Pulmonary Disease In Vivo Therapeutic potential of L carnitine in coronary artery disease: a systematic review Inflammopharmacology Springer Nature Link L carnitine tartrate supplementation in the fight against infectious disease