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 Revisiting the Role of Carnitine in Heart Disease Through the Lens of the Gut Microbiota L carnitine containing Food. Groups of Healthy Products Containing Vitamins and Minerals Stock Vector Illustration of mineral, salmon: 263509440 Carnitine: the claims and why it may not work L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe