New study links L carnitine in red meat to heart disease Harvard Health Did you know L Carnitine is also in food, mainly from red meat. However, if you're mainly eating white meat, fruits and veggies, you might not be getting enough. Swipe left to see What is L Carnitine? L Carnitine is a naturally occurring amino acid derivative that the human body can synthesize itself. It is mainly found in red meat and dairy products. [1] Core Benefits of Association between red meat consumption and the risk of cardiovascular disease: An important role of L carnitine metabolites Prevention Observatory of the Montreal Heart Institute