L Carnitine Injection Levocarnitine IV Frontiers L carnitine prevents lenvatinib induced muscle toxicity without impairment of the anti angiogenic efficacy L carnitine protects cardiac damage by reducing oxidative stress and inflammatory response via inhibition of tumor necrosis factor alpha and interleukin 1beta against isoproterenol induced myocardial infarction ScienceDirect Pharmacokinetics of L Carnitine Clinical Pharmacokinetics Springer Nature Link