Acetyl L Carnitine 500mg, 60 Capsules, Olympian LabsOlympian Labs Acetyl L Carnitine Dietary supplement. Acetyl L Carnitine is the ester form of L Carnitine; a naturally occurring amino acid metabolized from Lysine and Methionine and used extensively by the brain and nervous system. There is a significant amount of research on L Carnitine's role in cardiac and skeletal muscle function and in its role in fat metabolism loss. N Acetyl L Carnitine's research has focused mainly on its role in brain and