L carnitine low bioavailability . oral L carnitine 5% Biovy High Absorption Propionyl L Carnitine PLCAR No Artificial Filler Effective eBay SciELO Brasil Biomedical role of L carnitine in several organ systems, cellular tissues, and COVID 19 Biomedical role of L carnitine in several organ systems, cellular tissues, and COVID 19 L carnitine modified nanoparticles target the OCTN2 transporter to improve the oral absorption of jujuboside B ScienceDirect 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