L-Carnitine is a naturally occurring amino acid derivative that plays a vital role in energy production. It is primarily responsible for transporting long-chain fatty acids into the mitochondria, the energy-producing structures within cells, where they are burned for fuel. L-carnitine is commonly used as a dietary supplement to support energy metabolism, enhance physical performance, and aid in fat burning. It may also contribute to improved recovery from exercise and support heart health. It is found naturally in foods such as red meat and can be taken in supplement form for various health and fitness goals.