Chicken liver are fried with pepper, tomato and onion.. One serving of chicken liver provides more than 100 percent of the DRI for men and 72 percent for women. Iron is essential for the formation of hemoglobin, which carries oxygen throughout the body. One serving of chicken liver also supplies 63 percent of the DRI of phosphorus, more than 50 percent of copper, more than 30 percent of zinc and more than 100 percent of selenium.