What is L Carnitine? L Carnitine is an amino acid, naturally produced in the liver & kidneys. Stored in skeletal muscle, the heart & brain, the main dietary sources of L carnitine are red meat & dairy products. Why use L Carnitine? L Carnitine is a high quality supplement providing 1000mg of L Carnitine per serving. Who can benefit? L Carnitine is an ideal supplement for those looking to increase their L Carnitine intake. To be taken as part of a varied & balanced diet & a healthy lifestyle.