Clinical Effects of L Carnitine Supplementation on Physical Performance in Healthy Subjects, the Key to Success in Rehabilitation: A Systematic Review and Meta Analysis from the Rehabilitation Point of View Full article: Effects of high dose L carnitine supplementation on diaphragmatic function in patients with respiratory failure: A randomized clinical trial Role of carnitine in disease Nutrition & Metabolism Springer Nature Link Frontiers Age and APOE affect L carnitine system metabolites in the brain in the APOE TR model L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe 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