Are antibiotics given to the chickens the egg whites are sourced from? Antibiotics are only administered to hens in order to treat illness and only under a veterinarian’s care. Find full nutrition and ingredient information on the bottom of this page. Related articles What happens to the egg yolks? Do you use cage-free eggs? Are the chickens the eggs are sourced from given hormones? Where does RXBAR source its ingredients from? Does RXBAR use cooked egg whites?