Acetyl L Carnitine Primabolics L Carnitine #1 Non Stimulant Fat Burner Liquid L Carnitine Fun Sweets Orange Cream 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 Liquid L Carnitine PRO 3300mg Triple Strength Formula 450 ml Key Lime