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L-carnitine's main role in the body has to do with mitochondrial function and energy production. L-carnitine is a naturally occurring amino acid derivative that's often taken as a weight management supplement. It plays a crucial role in the production of energy by transporting fatty acids into your cells' mitochondria. The mitochondria act as engines within your cells, burning these fats to create usable energy. In cells, it helps transport fatty acids into the mitochondria, where they can be burned for energy. About 98 percent of the body's l-carnitine stores are found in your muscles, along with trace amounts in the liver and blood. For general health, it benefits your mitochondrial function and may help increase mitochondrial growth and health.