Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications L Carnitine is an amino acid that supports weight loss as it is a fat burning supplement. L Carnitine Push is a direct and quick IV infusion procedure that can be done on a weekly PDF) Comparison of pharmacokinetics of L carnitine, Acetyl L carnitine and Propionyl Lcarnitine after single oral administration of L carnitine in healthy volunteers Relative Bioavailability of Carnitine Supplementation in Premature Neonates