Full article: Effects of high dose L carnitine supplementation on diaphragmatic function in patients with respiratory failure: A randomized clinical trial 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 Does L Carnitine Cause Heart Problems? Role of carnitine in disease Nutrition & Metabolism Springer Nature Link Efficacy of L carnitine supplementation on frailty status and its biom CIA Dove Medical Press Carnitine The Nourishing Autism Collective