L Carnitine Linus Pauling Institute Oregon State University 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 L Carnitine: Benefits, Uses, Side Effects, and More L Carnitine 3000 liquid is designed to boost fat metabolism, enhance energy production, and improve exercise performance by transporting fatty acids into cells to be burned for fuel, take 30 60 minutes before training.