TMAO: Why It Increases & Factors That May Reduce TMAO levels SelfDecode Labs Carnitine: the claims and why it may not work 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 6 Healthy Foods High in L Carnitine L Carnitine For Weight Loss: 10 Key Benefits, Diet Plan, Dosage