Carnitine metabolism in hypertensive heart failure Hypertension Research L Carnitine: Benefits, Risks, and Its Role in Fitness and Weight Loss WellnessPulse 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 Extra cardiac BCAA catabolism lowers blood pressure and protects from heart failure: Cell Metabolism Revisiting the Role of Carnitine in Heart Disease Through the Lens of the Gut Microbiota