Carnitine: Top 3 Anti Aging Benefits of This Super Nutrient 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 Carnitines as Mitochondrial Modulators of Oocyte and Embryo Bioenergetics Carnitine shuttle system and beta oxidation of fatty acids Comprehensive review of the expanding roles of the carnitine pool in metabolic physiology: beyond fatty acid oxidation Journal of Translational Medicine Springer Nature Link