L Carnitine Oral Bioavailability NOW l Carnitine Supplement Pharmacokinetics of L Carnitine Clinical Pharmacokinetics Springer Nature Link Carnitine: Genetic Variants Affecting Mitochondrial Energy and Health L Carnitine Oral Bioavailability NOW l Carnitine Supplement What is L Carnitine, L Carnitine is an amino acid that plays a role in energy production and fat metabolism. Its found in foods like red meat, fish, and dairy, and also available as a supplement.,