L-carnitine is a nutrient and dietary supplement.
L-carnitine is an amino acid derivative that transports fatty acids into your cells to be
processed for energy.
It is made by your body and is also available as a supplement. In theory, using L-carnitine as a weight loss supplement makes sense. Since L-carnitine helps move more fatty acids into your cells to be burned for energy, you might think this would increase your ability to burn fat and lose weight. However, the human body is extremely complex, and the results of both human and animal studies are mixed. L-carnitine’s main role in your body involves mitochondrial function and energy production.