Surface modification with cholesteryl acetyl carnitine, a novel cationic agent, elevates cancer cell uptake of the PEGylated liposomes ScienceDirect Klaire Labs SFI Health L Carnitine Tartrate 500 mg Amino Acid Stabilized L Carnitine No Synthetic D Carnitine 60 Capsules Vista de Effect of different levels of L carnitine and lysine methionine on broiler blood parameters Revista MVZ Crdoba Benefits of L Carnitine for PCOS Landys Chemist L carnitine is a naturally occurring amino acid structure that is made in the human brain, liver, and kidneys. L carnitine plays a critical role in energy production, as it converts fat into energy.