Role of L carnitine in Cardiovascular Health: Literature Review Cureus The bright and the dark sides of L carnitine supplementation: a systematic review Journal of the International Society of Sports Nutrition Springer Nature Link L Carnitine Premiumsupps Acetyl L Carnitine : Metabolism & Weight Loss Supplements: Target 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.,