Carnitine Metabolite of the month biocrates life sciences gmbh L Methylfolate + L Carnitine + L Arginine + Pyridoxal 5 Phosphate + N Acetyl Cysteine + Omega 3 Manufacturer, Exporter from Solan L carnitine is primarily synthesized in the liver from the amino acids lysine and methionine through a series of four enzymatic reactions, with the liver and kidneys converting the precursor butyrobetaine into active Cysteine (and Cystine) Chemtymology NAC (N Acetyl L Cysteine)