what is a rich source of iron
Iron-Rich Foods. Very good sources of heme iron, with 3.5 milligrams or more per serving, include: 1  3 ounces of beef or chicken liver. 2  3 ounces of clams, mollusks, or mussels. 3  3 ounces of oysters.
Iron in plant foods such as lentils, beans, and spinach is nonheme iron. This is the form of iron added to iron-enriched and iron-fortified foods. Our bodies are less efficient at absorbing nonheme iron, but most dietary iron is nonheme iron. 1  1.