TMAO: how gut microbiota contributes to heart failure Translational Research Congestive Heart Failure: Supplements for Heart Health Spring Valley CoQ10 Plus L Carnitine Heart Health Dietary Supplement Softgels, 100 mg, 50 Count HSA FSA Eligible Walmart.com 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 Levocarnitine, commonly known as L Carnitine, is a naturally occurring compound that the body produces from the amino acids lysine and methionine. It plays a critical role in energy production by transporting fatty