L-carnitine is an amino acid that is involved in the transportation of fatty acids into the mitochondria of cells, where they can be used for energy production. It is often used as a dietary supplement to promote weight loss.

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L-carnitine is believed to promote weight loss by increasing the utilization of fats as a source of energy. It works by transporting fatty acids into the mitochondria, where they are oxidized and used for energy production. This process can help to reduce the amount of stored fat in the body, leading to weight loss.

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Additionally, L-carnitine may help to reduce fatigue and improve exercise performance. By increasing the utilization of fats for energy, L-carnitine can help to spare glycogen stores, which can be important for endurance exercise. This can lead to improved exercise performance and a greater ability to burn fat during exercise.

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Some studies have also suggested that L-carnitine may have a positive effect on metabolic rate and insulin sensitivity, which can further promote weight loss.