Pharmacokinetics of L Carnitine Clinical Pharmacokinetics Springer Nature Link Enhanced Bioavailability of L Carnitine After Painless Intradermal Delivery vs. Oral Administration in Rats Pharmaceutical Research Springer Nature Link Acetyl L Carnitine Study NOW Foods 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.,