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Carnitine is a quaternary ammonium compound involved in metabolism in most mammals, plants, and some bacteria.[1][2][3][4] In support of energy metabolism, carnitine transports long-chain fatty acids into mitochondria to be oxidized for energy production, and also participates in removing products of metabolism from cells.[3] Given its key metabolic roles, carnitine is concentrated in tissues like skeletal and car... [wikipedia]