Nutritional information may vary depending on flavour. L-carnitine is created in the body from the amino acid lysine and methionine, and our capsules are perfect for boosting your daily intake - through a unique liquid delivery system. What is l-carnitine? L-carnitine is an amino acid which is naturally produced in the body. It can also be found in food sources - red meat has the highest levels, but chicken, milk and dairy products also contain l-carnitine.