Pharmacokinetics of L Carnitine Clinical Pharmacokinetics Springer Nature Link L Carnitine Dosage Protocol PeptideDosages.com L Carnitine is one of the most hyped weight loss supplements online but here's what most won't tell you: Your body naturally produces L Carnitine using amino acids l, and a healthy person usually 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