Acetyl L Carnitine 637.5mg Source of Carnitine Energy & Cognitive Nutridom 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 Acetyl L Carnitine 500 mg Solgar Acetyl L Carnitine 1000 MG The Organic Market Acetyl L Carnitine 500 mg (60 Count) Compounding Pharmacy of America Acetyl L Carnitine (ALCAR) Supplement for Horses Mad Barn