Carnitine Rich Foods: Understanding L Carnitine and Its Benefits Loyal What even is carnitine?? Carnitine is a "conditionally" essential amino acid that becomes essential during pregnancy. What does this mean? You must get carnitine through food! The best sources are red Solaray L Carnitine, 500 mg 60 Capsules Smith's Food and Drug L Carnitine Linus Pauling Institute Oregon State University L Carnitine food supplement molecule. Chemical structure stick representation surrounded by a wireframe indication of the electrostatic potential. Ato Stock Photo Alamy