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Youle M, et al
"L-carnitine as peripheral antagonist of thyroid hormone." Ann NY Acad Sci 2004

Some of them include: L-carnitine may also enhance heart function in patients with severe heart disorders, including chronic heart failure

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paracasei , researchers demonstrated that the resulting postbiotic preparation significantly inhibited the TMA lyase enzymethe bacterial enzyme responsible for cleaving choline and carnitine into TMA

This is primarily due to L-carnitines ability to preserve muscle glycogen and use fatty acids as energy during exercise, sparing the use of amino acids, making them available for new protein synthesis to rebuild and grow muscle, per 2020 research in Molecules
