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If you want to shed fat fast without losing muscle mass, try L-carnitine for weight loss. Fitness enthusiasts and bodybuilders use it to improve muscle power and stamina, burn fat, and build lean muscle. L-carnitine is naturally found in dairy products, fish, and poultry. However, L-carnitine supplements are more effective for weight loss and building lean muscle mass. In This Article What Is L-Carnitine? Image: Shutterstock L-carnitine is a molecule involved in the oxidation of fatty acids in the mitochondria....