L Carnitine Linus Pauling Institute Oregon State University Carnitine: Genetic Variants Affecting Mitochondrial Energy and Health Assessing the In Vitro and In Vivo Performance of L Carnitine Loaded Nanoparticles in Combating Obesity L carnitine is effective for both fat loss and athletic performance. However, oral L carnitine has lower bioavailability and can be harmful at high doses, so it should be avoided. , Even cardiologists