RSP Nutrition Liquid L Carnitine 3000mg, Stimulant Free Metabolism Support, Peach Mango Flavor Walmart.com Foods High in L Carnitine for Energy and Health Marnys 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 What Are the Signs and Symptoms of Primary Carnitine Deficiency? StoryMD