L carnitine Supplementation as Treatment for Cardiac Fibrosis and Heart Failure with Preserved Ejection Fraction Primary carnitine deficiency cardiomyopathy International Journal of Cardiology The effects of L carnitine in children with kidney failure undergoing dialysis: a systematic review Pediatric Nephrology Springer Nature Link The Potential Connection Between Mechanical Stress and Heart Failure with Preserved Ejection Fraction: Mechanistic Insights and Therapeutic Potential The Effect of Carnitine Supplementation on Left Ventricular Function: Lessons from Current Evidence and Insights for Future Studies