What is L Carnitine, L Carnitine is an amino acid that plays a role in energy production and fat metabolism. Its found in foods like red meat, fish, and dairy, and also available as a supplement., Pharmacokinetics of L Carnitine Clinical Pharmacokinetics Springer Nature Link 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 The Role of l Carnitine in Mitochondria, Prevention of Metabolic Inflexibility and Disease Initiation