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. Shop all RXBAR products Related articles What happens to the egg yolks? Do you use cage-free eggs? Are the chickens the eggs are sourced from given hormones? Does RXBAR use cooked egg whites? Where does RXBAR source its ingredients from?